applying transfer to react app

node_modules/eslint-plugin-react/lib/util/Components.js

@@ -0,0 +1,970 @@
+/**
+ * @fileoverview Utility class and functions for React components detection
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const doctrine = require('doctrine');
+const arrayIncludes = require('array-includes');
+const values = require('object.values');
+
+const variableUtil = require('./variable');
+const pragmaUtil = require('./pragma');
+const astUtil = require('./ast');
+const propTypesUtil = require('./propTypes');
+const jsxUtil = require('./jsx');
+const usedPropTypesUtil = require('./usedPropTypes');
+const defaultPropsUtil = require('./defaultProps');
+const isFirstLetterCapitalized = require('./isFirstLetterCapitalized');
+
+function getId(node) {
+  return node && node.range.join(':');
+}
+
+function usedPropTypesAreEquivalent(propA, propB) {
+  if (propA.name === propB.name) {
+    if (!propA.allNames && !propB.allNames) {
+      return true;
+    }
+    if (Array.isArray(propA.allNames) && Array.isArray(propB.allNames) && propA.allNames.join('') === propB.allNames.join('')) {
+      return true;
+    }
+    return false;
+  }
+  return false;
+}
+
+function mergeUsedPropTypes(propsList, newPropsList) {
+  const propsToAdd = newPropsList.filter((newProp) => {
+    const newPropIsAlreadyInTheList = propsList.some((prop) => usedPropTypesAreEquivalent(prop, newProp));
+    return !newPropIsAlreadyInTheList;
+  });
+
+  return propsList.concat(propsToAdd);
+}
+
+const Lists = new WeakMap();
+
+/**
+ * Components
+ */
+class Components {
+  constructor() {
+    Lists.set(this, {});
+  }
+
+  /**
+   * Add a node to the components list, or update it if it's already in the list
+   *
+   * @param {ASTNode} node The AST node being added.
+   * @param {Number} confidence Confidence in the component detection (0=banned, 1=maybe, 2=yes)
+   * @returns {Object} Added component object
+   */
+  add(node, confidence) {
+    const id = getId(node);
+    const list = Lists.get(this);
+    if (list[id]) {
+      if (confidence === 0 || list[id].confidence === 0) {
+        list[id].confidence = 0;
+      } else {
+        list[id].confidence = Math.max(list[id].confidence, confidence);
+      }
+      return list[id];
+    }
+    list[id] = {
+      node,
+      confidence
+    };
+    return list[id];
+  }
+
+  /**
+   * Find a component in the list using its node
+   *
+   * @param {ASTNode} node The AST node being searched.
+   * @returns {Object} Component object, undefined if the component is not found or has confidence value of 0.
+   */
+  get(node) {
+    const id = getId(node);
+    const item = Lists.get(this)[id];
+    if (item && item.confidence >= 1) {
+      return item;
+    }
+    return null;
+  }
+
+  /**
+   * Update a component in the list
+   *
+   * @param {ASTNode} node The AST node being updated.
+   * @param {Object} props Additional properties to add to the component.
+   */
+  set(node, props) {
+    const list = Lists.get(this);
+    let component = list[getId(node)];
+    while (!component) {
+      node = node.parent;
+      if (!node) {
+        return;
+      }
+      component = list[getId(node)];
+    }
+
+    Object.assign(
+      component,
+      props,
+      {
+        usedPropTypes: mergeUsedPropTypes(
+          component.usedPropTypes || [],
+          props.usedPropTypes || []
+        )
+      }
+    );
+  }
+
+  /**
+   * Return the components list
+   * Components for which we are not confident are not returned
+   *
+   * @returns {Object} Components list
+   */
+  list() {
+    const thisList = Lists.get(this);
+    const list = {};
+    const usedPropTypes = {};
+
+    // Find props used in components for which we are not confident
+    Object.keys(thisList).filter((i) => thisList[i].confidence < 2).forEach((i) => {
+      let component = null;
+      let node = null;
+      node = thisList[i].node;
+      while (!component && node.parent) {
+        node = node.parent;
+        // Stop moving up if we reach a decorator
+        if (node.type === 'Decorator') {
+          break;
+        }
+        component = this.get(node);
+      }
+      if (component) {
+        const newUsedProps = (thisList[i].usedPropTypes || []).filter((propType) => !propType.node || propType.node.kind !== 'init');
+
+        const componentId = getId(component.node);
+
+        usedPropTypes[componentId] = mergeUsedPropTypes(usedPropTypes[componentId] || [], newUsedProps);
+      }
+    });
+
+    // Assign used props in not confident components to the parent component
+    Object.keys(thisList).filter((j) => thisList[j].confidence >= 2).forEach((j) => {
+      const id = getId(thisList[j].node);
+      list[j] = thisList[j];
+      if (usedPropTypes[id]) {
+        list[j].usedPropTypes = mergeUsedPropTypes(list[j].usedPropTypes || [], usedPropTypes[id]);
+      }
+    });
+    return list;
+  }
+
+  /**
+   * Return the length of the components list
+   * Components for which we are not confident are not counted
+   *
+   * @returns {Number} Components list length
+   */
+  length() {
+    const list = Lists.get(this);
+    return Object.keys(list).filter((i) => list[i].confidence >= 2).length;
+  }
+}
+
+function getWrapperFunctions(context, pragma) {
+  const componentWrapperFunctions = context.settings.componentWrapperFunctions || [];
+
+  // eslint-disable-next-line arrow-body-style
+  return componentWrapperFunctions.map((wrapperFunction) => {
+    return typeof wrapperFunction === 'string'
+      ? {property: wrapperFunction}
+      : Object.assign({}, wrapperFunction, {
+        object: wrapperFunction.object === '<pragma>' ? pragma : wrapperFunction.object
+      });
+  }).concat([
+    {property: 'forwardRef', object: pragma},
+    {property: 'memo', object: pragma}
+  ]);
+}
+
+function componentRule(rule, context) {
+  const createClass = pragmaUtil.getCreateClassFromContext(context);
+  const pragma = pragmaUtil.getFromContext(context);
+  const sourceCode = context.getSourceCode();
+  const components = new Components();
+  const wrapperFunctions = getWrapperFunctions(context, pragma);
+
+  // Utilities for component detection
+  const utils = {
+
+    /**
+     * Check if the node is a React ES5 component
+     *
+     * @param {ASTNode} node The AST node being checked.
+     * @returns {Boolean} True if the node is a React ES5 component, false if not
+     */
+    isES5Component(node) {
+      if (!node.parent) {
+        return false;
+      }
+      return new RegExp(`^(${pragma}\\.)?${createClass}$`).test(sourceCode.getText(node.parent.callee));
+    },
+
+    /**
+     * Check if the node is a React ES6 component
+     *
+     * @param {ASTNode} node The AST node being checked.
+     * @returns {Boolean} True if the node is a React ES6 component, false if not
+     */
+    isES6Component(node) {
+      if (utils.isExplicitComponent(node)) {
+        return true;
+      }
+
+      if (!node.superClass) {
+        return false;
+      }
+      return new RegExp(`^(${pragma}\\.)?(Pure)?Component$`).test(sourceCode.getText(node.superClass));
+    },
+
+    /**
+     * Check if the node is explicitly declared as a descendant of a React Component
+     *
+     * @param {ASTNode} node The AST node being checked (can be a ReturnStatement or an ArrowFunctionExpression).
+     * @returns {Boolean} True if the node is explicitly declared as a descendant of a React Component, false if not
+     */
+    isExplicitComponent(node) {
+      let comment;
+      // Sometimes the passed node may not have been parsed yet by eslint, and this function call crashes.
+      // Can be removed when eslint sets "parent" property for all nodes on initial AST traversal: https://github.com/eslint/eslint-scope/issues/27
+      // eslint-disable-next-line no-warning-comments
+      // FIXME: Remove try/catch when https://github.com/eslint/eslint-scope/issues/27 is implemented.
+      try {
+        comment = sourceCode.getJSDocComment(node);
+      } catch (e) {
+        comment = null;
+      }
+
+      if (comment === null) {
+        return false;
+      }
+
+      const commentAst = doctrine.parse(comment.value, {
+        unwrap: true,
+        tags: ['extends', 'augments']
+      });
+
+      const relevantTags = commentAst.tags.filter((tag) => tag.name === 'React.Component' || tag.name === 'React.PureComponent');
+
+      return relevantTags.length > 0;
+    },
+
+    /**
+     * Checks to see if our component extends React.PureComponent
+     *
+     * @param {ASTNode} node The AST node being checked.
+     * @returns {Boolean} True if node extends React.PureComponent, false if not
+     */
+    isPureComponent(node) {
+      if (node.superClass) {
+        return new RegExp(`^(${pragma}\\.)?PureComponent$`).test(sourceCode.getText(node.superClass));
+      }
+      return false;
+    },
+
+    /**
+     * Check if variable is destructured from pragma import
+     *
+     * @param {string} variable The variable name to check
+     * @returns {Boolean} True if createElement is destructured from the pragma
+     */
+    isDestructuredFromPragmaImport(variable) {
+      const variables = variableUtil.variablesInScope(context);
+      const variableInScope = variableUtil.getVariable(variables, variable);
+      if (variableInScope) {
+        const latestDef = variableUtil.getLatestVariableDefinition(variableInScope);
+        if (latestDef) {
+          // check if latest definition is a variable declaration: 'variable = value'
+          if (latestDef.node.type === 'VariableDeclarator' && latestDef.node.init) {
+            // check for: 'variable = pragma.variable'
+            if (
+              latestDef.node.init.type === 'MemberExpression'
+              && latestDef.node.init.object.type === 'Identifier'
+              && latestDef.node.init.object.name === pragma
+            ) {
+              return true;
+            }
+            // check for: '{variable} = pragma'
+            if (
+              latestDef.node.init.type === 'Identifier'
+              && latestDef.node.init.name === pragma
+            ) {
+              return true;
+            }
+
+            // "require('react')"
+            let requireExpression = null;
+
+            // get "require('react')" from: "{variable} = require('react')"
+            if (latestDef.node.init.type === 'CallExpression') {
+              requireExpression = latestDef.node.init;
+            }
+            // get "require('react')" from: "variable = require('react').variable"
+            if (
+              !requireExpression
+              && latestDef.node.init.type === 'MemberExpression'
+              && latestDef.node.init.object.type === 'CallExpression'
+            ) {
+              requireExpression = latestDef.node.init.object;
+            }
+
+            // check proper require.
+            if (
+              requireExpression
+              && requireExpression.callee
+              && requireExpression.callee.name === 'require'
+              && requireExpression.arguments[0]
+              && requireExpression.arguments[0].value === pragma.toLocaleLowerCase()
+            ) {
+              return true;
+            }
+
+            return false;
+          }
+
+          // latest definition is an import declaration: import {<variable>} from 'react'
+          if (
+            latestDef.parent
+            && latestDef.parent.type === 'ImportDeclaration'
+            && latestDef.parent.source.value === pragma.toLocaleLowerCase()
+          ) {
+            return true;
+          }
+        }
+      }
+      return false;
+    },
+
+    /**
+     * Checks to see if node is called within createElement from pragma
+     *
+     * @param {ASTNode} node The AST node being checked.
+     * @returns {Boolean} True if createElement called from pragma
+     */
+    isCreateElement(node) {
+      // match `React.createElement()`
+      if (
+        node
+        && node.callee
+        && node.callee.object
+        && node.callee.object.name === pragma
+        && node.callee.property
+        && node.callee.property.name === 'createElement'
+      ) {
+        return true;
+      }
+
+      // match `createElement()`
+      if (
+        node
+        && node.callee
+        && node.callee.name === 'createElement'
+        && this.isDestructuredFromPragmaImport('createElement')
+      ) {
+        return true;
+      }
+
+      return false;
+    },
+
+    /**
+     * Check if we are in a class constructor
+     * @return {boolean} true if we are in a class constructor, false if not
+     */
+    inConstructor() {
+      let scope = context.getScope();
+      while (scope) {
+        if (scope.block && scope.block.parent && scope.block.parent.kind === 'constructor') {
+          return true;
+        }
+        scope = scope.upper;
+      }
+      return false;
+    },
+
+    /**
+     * Determine if the node is MemberExpression of `this.state`
+     * @param {Object} node The node to process
+     * @returns {Boolean}
+     */
+    isStateMemberExpression(node) {
+      return node.type === 'MemberExpression' && node.object.type === 'ThisExpression' && node.property.name === 'state';
+    },
+
+    isReturningJSX(ASTNode, strict) {
+      return jsxUtil.isReturningJSX(this.isCreateElement.bind(this), ASTNode, context, strict, true);
+    },
+
+    isReturningJSXOrNull(ASTNode, strict) {
+      return jsxUtil.isReturningJSX(this.isCreateElement.bind(this), ASTNode, context, strict);
+    },
+
+    getPragmaComponentWrapper(node) {
+      let isPragmaComponentWrapper;
+      let currentNode = node;
+      let prevNode;
+      do {
+        currentNode = currentNode.parent;
+        isPragmaComponentWrapper = this.isPragmaComponentWrapper(currentNode);
+        if (isPragmaComponentWrapper) {
+          prevNode = currentNode;
+        }
+      } while (isPragmaComponentWrapper);
+
+      return prevNode;
+    },
+
+    getComponentNameFromJSXElement(node) {
+      if (node.type !== 'JSXElement') {
+        return null;
+      }
+      if (node.openingElement && node.openingElement.name && node.openingElement.name.name) {
+        return node.openingElement.name.name;
+      }
+      return null;
+    },
+
+    /**
+     * Getting the first JSX element's name.
+     * @param {object} node
+     * @returns {string | null}
+     */
+    getNameOfWrappedComponent(node) {
+      if (node.length < 1) {
+        return null;
+      }
+      const body = node[0].body;
+      if (!body) {
+        return null;
+      }
+      if (body.type === 'JSXElement') {
+        return this.getComponentNameFromJSXElement(body);
+      }
+      if (body.type === 'BlockStatement') {
+        const jsxElement = body.body.find((item) => item.type === 'ReturnStatement');
+        return jsxElement
+          && jsxElement.argument
+          && this.getComponentNameFromJSXElement(jsxElement.argument);
+      }
+      return null;
+    },
+
+    /**
+     * Get the list of names of components created till now
+     * @returns {string | boolean}
+     */
+    getDetectedComponents() {
+      const list = components.list();
+      return values(list).filter((val) => {
+        if (val.node.type === 'ClassDeclaration') {
+          return true;
+        }
+        if (
+          val.node.type === 'ArrowFunctionExpression'
+          && val.node.parent
+          && val.node.parent.type === 'VariableDeclarator'
+          && val.node.parent.id
+        ) {
+          return true;
+        }
+        return false;
+      }).map((val) => {
+        if (val.node.type === 'ArrowFunctionExpression') return val.node.parent.id.name;
+        return val.node.id && val.node.id.name;
+      });
+    },
+
+    /**
+     * It will check wheater memo/forwardRef is wrapping existing component or
+     * creating a new one.
+     * @param {object} node
+     * @returns {boolean}
+     */
+    nodeWrapsComponent(node) {
+      const childComponent = this.getNameOfWrappedComponent(node.arguments);
+      const componentList = this.getDetectedComponents();
+      return !!childComponent && arrayIncludes(componentList, childComponent);
+    },
+
+    isPragmaComponentWrapper(node) {
+      if (!node || node.type !== 'CallExpression') {
+        return false;
+      }
+
+      return wrapperFunctions.some((wrapperFunction) => {
+        if (node.callee.type === 'MemberExpression') {
+          return wrapperFunction.object
+            && wrapperFunction.object === node.callee.object.name
+            && wrapperFunction.property === node.callee.property.name
+            && !this.nodeWrapsComponent(node);
+        }
+        return wrapperFunction.property === node.callee.name
+          && (!wrapperFunction.object
+            // Functions coming from the current pragma need special handling
+            || (wrapperFunction.object === pragma && this.isDestructuredFromPragmaImport(node.callee.name))
+          );
+      });
+    },
+
+    /**
+     * Find a return statement in the current node
+     *
+     * @param {ASTNode} node The AST node being checked
+     */
+    findReturnStatement: astUtil.findReturnStatement,
+
+    /**
+     * Get the parent component node from the current scope
+     *
+     * @returns {ASTNode} component node, null if we are not in a component
+     */
+    getParentComponent() {
+      return (
+        utils.getParentES6Component()
+        || utils.getParentES5Component()
+        || utils.getParentStatelessComponent()
+      );
+    },
+
+    /**
+     * Get the parent ES5 component node from the current scope
+     *
+     * @returns {ASTNode} component node, null if we are not in a component
+     */
+    getParentES5Component() {
+      let scope = context.getScope();
+      while (scope) {
+        const node = scope.block && scope.block.parent && scope.block.parent.parent;
+        if (node && utils.isES5Component(node)) {
+          return node;
+        }
+        scope = scope.upper;
+      }
+      return null;
+    },
+
+    /**
+     * Get the parent ES6 component node from the current scope
+     *
+     * @returns {ASTNode} component node, null if we are not in a component
+     */
+    getParentES6Component() {
+      let scope = context.getScope();
+      while (scope && scope.type !== 'class') {
+        scope = scope.upper;
+      }
+      const node = scope && scope.block;
+      if (!node || !utils.isES6Component(node)) {
+        return null;
+      }
+      return node;
+    },
+
+    /**
+     * @param {ASTNode} node
+     * @returns {boolean}
+     */
+    isInAllowedPositionForComponent(node) {
+      switch (node.parent.type) {
+        case 'VariableDeclarator':
+        case 'AssignmentExpression':
+        case 'Property':
+        case 'ReturnStatement':
+        case 'ExportDefaultDeclaration':
+        case 'ArrowFunctionExpression': {
+          return true;
+        }
+        case 'SequenceExpression': {
+          return utils.isInAllowedPositionForComponent(node.parent)
+            && node === node.parent.expressions[node.parent.expressions.length - 1];
+        }
+        default:
+          return false;
+      }
+    },
+
+    /**
+     * Get node if node is a stateless component, or node.parent in cases like
+     * `React.memo` or `React.forwardRef`. Otherwise returns `undefined`.
+     * @param {ASTNode} node
+     * @returns {ASTNode | undefined}
+     */
+    getStatelessComponent(node) {
+      const parent = node.parent;
+      if (
+        node.type === 'FunctionDeclaration'
+        && (!node.id || isFirstLetterCapitalized(node.id.name))
+        && utils.isReturningJSXOrNull(node)
+      ) {
+        return node;
+      }
+
+      if (node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') {
+        const isMethod = parent.type === 'Property' && parent.method;
+        const isPropertyAssignment = parent.type === 'AssignmentExpression'
+          && parent.left.type === 'MemberExpression';
+        const isModuleExportsAssignment = isPropertyAssignment
+          && parent.left.object.name === 'module'
+          && parent.left.property.name === 'exports';
+
+        if (node.parent.type === 'ExportDefaultDeclaration') {
+          if (utils.isReturningJSX(node)) {
+            return node;
+          }
+          return undefined;
+        }
+
+        if (node.parent.type === 'VariableDeclarator' && utils.isReturningJSXOrNull(node)) {
+          if (isFirstLetterCapitalized(node.parent.id.name)) {
+            return node;
+          }
+          return undefined;
+        }
+
+        // Case like `React.memo(() => <></>)` or `React.forwardRef(...)`
+        const pragmaComponentWrapper = utils.getPragmaComponentWrapper(node);
+        if (pragmaComponentWrapper) {
+          return pragmaComponentWrapper;
+        }
+
+        if (!(utils.isInAllowedPositionForComponent(node) && utils.isReturningJSXOrNull(node))) {
+          return undefined;
+        }
+
+        if (utils.isParentComponentNotStatelessComponent(node)) {
+          return undefined;
+        }
+
+        if (isMethod && !isFirstLetterCapitalized(node.parent.key.name)) {
+          return utils.isReturningJSX(node) ? node : undefined;
+        }
+
+        if (node.id) {
+          return isFirstLetterCapitalized(node.id.name) ? node : undefined;
+        }
+
+        if (
+          isPropertyAssignment
+          && !isModuleExportsAssignment
+          && !isFirstLetterCapitalized(parent.left.property.name)
+        ) {
+          return undefined;
+        }
+
+        return node;
+      }
+
+      return undefined;
+    },
+
+    /**
+     * Get the parent stateless component node from the current scope
+     *
+     * @returns {ASTNode} component node, null if we are not in a component
+     */
+    getParentStatelessComponent() {
+      let scope = context.getScope();
+      while (scope) {
+        const node = scope.block;
+        const statelessComponent = utils.getStatelessComponent(node);
+        if (statelessComponent) {
+          return statelessComponent;
+        }
+        scope = scope.upper;
+      }
+      return null;
+    },
+
+    /**
+     * Get the related component from a node
+     *
+     * @param {ASTNode} node The AST node being checked (must be a MemberExpression).
+     * @returns {ASTNode} component node, null if we cannot find the component
+     */
+    getRelatedComponent(node) {
+      let i;
+      let j;
+      let k;
+      let l;
+      let componentNode;
+      // Get the component path
+      const componentPath = [];
+      while (node) {
+        if (node.property && node.property.type === 'Identifier') {
+          componentPath.push(node.property.name);
+        }
+        if (node.object && node.object.type === 'Identifier') {
+          componentPath.push(node.object.name);
+        }
+        node = node.object;
+      }
+      componentPath.reverse();
+      const componentName = componentPath.slice(0, componentPath.length - 1).join('.');
+
+      // Find the variable in the current scope
+      const variableName = componentPath.shift();
+      if (!variableName) {
+        return null;
+      }
+      let variableInScope;
+      const variables = variableUtil.variablesInScope(context);
+      for (i = 0, j = variables.length; i < j; i++) {
+        if (variables[i].name === variableName) {
+          variableInScope = variables[i];
+          break;
+        }
+      }
+      if (!variableInScope) {
+        return null;
+      }
+
+      // Try to find the component using variable references
+      const refs = variableInScope.references;
+      refs.some((ref) => {
+        let refId = ref.identifier;
+        if (refId.parent && refId.parent.type === 'MemberExpression') {
+          refId = refId.parent;
+        }
+        if (sourceCode.getText(refId) !== componentName) {
+          return false;
+        }
+        if (refId.type === 'MemberExpression') {
+          componentNode = refId.parent.right;
+        } else if (
+          refId.parent
+          && refId.parent.type === 'VariableDeclarator'
+          && refId.parent.init
+          && refId.parent.init.type !== 'Identifier'
+        ) {
+          componentNode = refId.parent.init;
+        }
+        return true;
+      });
+
+      if (componentNode) {
+        // Return the component
+        return components.add(componentNode, 1);
+      }
+
+      // Try to find the component using variable declarations
+      const defs = variableInScope.defs;
+      const defInScope = defs.find((def) => (
+        def.type === 'ClassName'
+        || def.type === 'FunctionName'
+        || def.type === 'Variable'
+      ));
+      if (!defInScope || !defInScope.node) {
+        return null;
+      }
+      componentNode = defInScope.node.init || defInScope.node;
+
+      // Traverse the node properties to the component declaration
+      for (i = 0, j = componentPath.length; i < j; i++) {
+        if (!componentNode.properties) {
+          continue; // eslint-disable-line no-continue
+        }
+        for (k = 0, l = componentNode.properties.length; k < l; k++) {
+          if (componentNode.properties[k].key && componentNode.properties[k].key.name === componentPath[i]) {
+            componentNode = componentNode.properties[k];
+            break;
+          }
+        }
+        if (!componentNode || !componentNode.value) {
+          return null;
+        }
+        componentNode = componentNode.value;
+      }
+
+      // Return the component
+      return components.add(componentNode, 1);
+    },
+
+    isParentComponentNotStatelessComponent(node) {
+      return !!(
+        node.parent
+        && node.parent.key
+        && node.parent.key.type === 'Identifier'
+        // custom component functions must start with a capital letter (returns false otherwise)
+        && node.parent.key.name.charAt(0) === node.parent.key.name.charAt(0).toLowerCase()
+        // react render function cannot have params
+        && !!(node.params || []).length
+      );
+    }
+  };
+
+  // Component detection instructions
+  const detectionInstructions = {
+    CallExpression(node) {
+      if (!utils.isPragmaComponentWrapper(node)) {
+        return;
+      }
+      if (node.arguments.length > 0 && astUtil.isFunctionLikeExpression(node.arguments[0])) {
+        components.add(node, 2);
+      }
+    },
+
+    ClassExpression(node) {
+      if (!utils.isES6Component(node)) {
+        return;
+      }
+      components.add(node, 2);
+    },
+
+    ClassDeclaration(node) {
+      if (!utils.isES6Component(node)) {
+        return;
+      }
+      components.add(node, 2);
+    },
+
+    ClassProperty(node) {
+      node = utils.getParentComponent();
+      if (!node) {
+        return;
+      }
+      components.add(node, 2);
+    },
+
+    ObjectExpression(node) {
+      if (!utils.isES5Component(node)) {
+        return;
+      }
+      components.add(node, 2);
+    },
+
+    FunctionExpression(node) {
+      if (node.async) {
+        components.add(node, 0);
+        return;
+      }
+
+      const component = utils.getParentComponent();
+      if (
+        !component
+        || (component.parent && component.parent.type === 'JSXExpressionContainer')
+      ) {
+        // Ban the node if we cannot find a parent component
+        components.add(node, 0);
+        return;
+      }
+      components.add(component, 1);
+    },
+
+    FunctionDeclaration(node) {
+      if (node.async) {
+        components.add(node, 0);
+        return;
+      }
+
+      node = utils.getParentComponent();
+      if (!node) {
+        return;
+      }
+      components.add(node, 1);
+    },
+
+    ArrowFunctionExpression(node) {
+      if (node.async) {
+        components.add(node, 0);
+        return;
+      }
+
+      const component = utils.getParentComponent();
+
+      if (
+        !component
+        || (component.parent && component.parent.type === 'JSXExpressionContainer')
+      ) {
+        // Ban the node if we cannot find a parent component
+        components.add(node, 0);
+        return;
+      }
+      if (component.expression && utils.isReturningJSX(component)) {
+        components.add(component, 2);
+      } else {
+        components.add(component, 1);
+      }
+    },
+
+    ThisExpression(node) {
+      const component = utils.getParentComponent();
+      if (!component || !/Function/.test(component.type) || !node.parent.property) {
+        return;
+      }
+      // Ban functions accessing a property on a ThisExpression
+      components.add(node, 0);
+    },
+
+    ReturnStatement(node) {
+      if (!utils.isReturningJSX(node)) {
+        return;
+      }
+      node = utils.getParentComponent();
+      if (!node) {
+        const scope = context.getScope();
+        components.add(scope.block, 1);
+        return;
+      }
+      components.add(node, 2);
+    }
+  };
+
+  // Update the provided rule instructions to add the component detection
+  const ruleInstructions = rule(context, components, utils);
+  const updatedRuleInstructions = Object.assign({}, ruleInstructions);
+  const propTypesInstructions = propTypesUtil(context, components, utils);
+  const usedPropTypesInstructions = usedPropTypesUtil(context, components, utils);
+  const defaultPropsInstructions = defaultPropsUtil(context, components, utils);
+  const allKeys = new Set(Object.keys(detectionInstructions).concat(
+    Object.keys(propTypesInstructions),
+    Object.keys(usedPropTypesInstructions),
+    Object.keys(defaultPropsInstructions)
+  ));
+
+  allKeys.forEach((instruction) => {
+    updatedRuleInstructions[instruction] = (node) => {
+      if (instruction in detectionInstructions) {
+        detectionInstructions[instruction](node);
+      }
+      if (instruction in propTypesInstructions) {
+        propTypesInstructions[instruction](node);
+      }
+      if (instruction in usedPropTypesInstructions) {
+        usedPropTypesInstructions[instruction](node);
+      }
+      if (instruction in defaultPropsInstructions) {
+        defaultPropsInstructions[instruction](node);
+      }
+      if (ruleInstructions[instruction]) {
+        return ruleInstructions[instruction](node);
+      }
+    };
+  });
+
+  // Return the updated rule instructions
+  return updatedRuleInstructions;
+}
+
+module.exports = Object.assign(Components, {
+  detect(rule) {
+    return componentRule.bind(this, rule);
+  }
+});

node_modules/eslint-plugin-react/lib/util/annotations.js

@@ -0,0 +1,32 @@
+/**
+ * @fileoverview Utility functions for type annotation detection.
+ * @author Yannick Croissant
+ * @author Vitor Balocco
+ */
+
+'use strict';
+
+/**
+ * Checks if we are declaring a `props` argument with a flow type annotation.
+ * @param {ASTNode} node The AST node being checked.
+ * @param {Object} context
+ * @returns {Boolean} True if the node is a type annotated props declaration, false if not.
+ */
+function isAnnotatedFunctionPropsDeclaration(node, context) {
+  if (!node || !node.params || !node.params.length) {
+    return false;
+  }
+
+  const typeNode = node.params[0].type === 'AssignmentPattern' ? node.params[0].left : node.params[0];
+
+  const tokens = context.getFirstTokens(typeNode, 2);
+  const isAnnotated = typeNode.typeAnnotation;
+  const isDestructuredProps = typeNode.type === 'ObjectPattern';
+  const isProps = tokens[0].value === 'props' || (tokens[1] && tokens[1].value === 'props');
+
+  return (isAnnotated && (isDestructuredProps || isProps));
+}
+
+module.exports = {
+  isAnnotatedFunctionPropsDeclaration
+};

node_modules/eslint-plugin-react/lib/util/ast.js

@@ -0,0 +1,383 @@
+/**
+ * @fileoverview Utility functions for AST
+ */
+
+'use strict';
+
+const estraverse = require('estraverse');
+// const pragmaUtil = require('./pragma');
+
+/**
+ * Wrapper for estraverse.traverse
+ *
+ * @param {ASTNode} ASTnode The AST node being checked
+ * @param {Object} visitor Visitor Object for estraverse
+ */
+function traverse(ASTnode, visitor) {
+  const opts = Object.assign({}, {
+    fallback(node) {
+      return Object.keys(node).filter((key) => key === 'children' || key === 'argument');
+    }
+  }, visitor);
+
+  opts.keys = Object.assign({}, visitor.keys, {
+    JSXElement: ['children'],
+    JSXFragment: ['children']
+  });
+
+  estraverse.traverse(ASTnode, opts);
+}
+
+/**
+ * Find a return statment in the current node
+ *
+ * @param {ASTNode} node The AST node being checked
+ * @returns {ASTNode | false}
+ */
+function findReturnStatement(node) {
+  if (
+    (!node.value || !node.value.body || !node.value.body.body)
+    && (!node.body || !node.body.body)
+  ) {
+    return false;
+  }
+
+  const bodyNodes = (node.value ? node.value.body.body : node.body.body);
+
+  return (function loopNodes(nodes) {
+    let i = nodes.length - 1;
+    for (; i >= 0; i--) {
+      if (nodes[i].type === 'ReturnStatement') {
+        return nodes[i];
+      }
+      if (nodes[i].type === 'SwitchStatement') {
+        let j = nodes[i].cases.length - 1;
+        for (; j >= 0; j--) {
+          return loopNodes(nodes[i].cases[j].consequent);
+        }
+      }
+    }
+    return false;
+  }(bodyNodes));
+}
+
+/**
+ * Helper function for traversing "returns" (return statements or the
+ * returned expression in the case of an arrow function) of a function
+ *
+ * @param {ASTNode} ASTNode The AST node being checked
+ * @param {Context} context The context of `ASTNode`.
+ * @param {function} enterFunc Function to execute for each returnStatement found
+ * @returns {undefined}
+ */
+function traverseReturns(ASTNode, context, enterFunc) {
+  const nodeType = ASTNode.type;
+
+  if (nodeType === 'ReturnStatement') {
+    return enterFunc(ASTNode);
+  }
+
+  if (nodeType === 'ArrowFunctionExpression' && ASTNode.expression) {
+    return enterFunc(ASTNode.body);
+  }
+
+  /* TODO: properly warn on React.forwardRefs having typo properties
+  if (nodeType === 'CallExpression') {
+    const callee = ASTNode.callee;
+    const pragma = pragmaUtil.getFromContext(context);
+    if (
+      callee.type === 'MemberExpression'
+      && callee.object.type === 'Identifier'
+      && callee.object.name === pragma
+      && callee.property.type === 'Identifier'
+      && callee.property.name === 'forwardRef'
+      && ASTNode.arguments.length > 0
+    ) {
+      return enterFunc(ASTNode.arguments[0]);
+    }
+    return;
+  }
+  */
+
+  if (
+    nodeType !== 'FunctionExpression'
+    && nodeType !== 'FunctionDeclaration'
+    && nodeType !== 'ArrowFunctionExpression'
+    && nodeType !== 'MethodDefinition'
+  ) {
+    return;
+  }
+
+  traverse(ASTNode.body, {
+    enter(node) {
+      switch (node.type) {
+        case 'ReturnStatement':
+          this.skip();
+          return enterFunc(node);
+        case 'FunctionExpression':
+        case 'FunctionDeclaration':
+        case 'ArrowFunctionExpression':
+          return this.skip();
+        default:
+      }
+    }
+  });
+}
+
+/**
+ * Get node with property's name
+ * @param {Object} node - Property.
+ * @returns {Object} Property name node.
+ */
+function getPropertyNameNode(node) {
+  if (node.key || ['MethodDefinition', 'Property'].indexOf(node.type) !== -1) {
+    return node.key;
+  }
+  if (node.type === 'MemberExpression') {
+    return node.property;
+  }
+  return null;
+}
+
+/**
+ * Get properties name
+ * @param {Object} node - Property.
+ * @returns {String} Property name.
+ */
+function getPropertyName(node) {
+  const nameNode = getPropertyNameNode(node);
+  return nameNode ? nameNode.name : '';
+}
+
+/**
+ * Get properties for a given AST node
+ * @param {ASTNode} node The AST node being checked.
+ * @returns {Array} Properties array.
+ */
+function getComponentProperties(node) {
+  switch (node.type) {
+    case 'ClassDeclaration':
+    case 'ClassExpression':
+      return node.body.body;
+    case 'ObjectExpression':
+      return node.properties;
+    default:
+      return [];
+  }
+}
+
+/**
+ * Gets the first node in a line from the initial node, excluding whitespace.
+ * @param {Object} context The node to check
+ * @param {ASTNode} node The node to check
+ * @return {ASTNode} the first node in the line
+ */
+function getFirstNodeInLine(context, node) {
+  const sourceCode = context.getSourceCode();
+  let token = node;
+  let lines;
+  do {
+    token = sourceCode.getTokenBefore(token);
+    lines = token.type === 'JSXText'
+      ? token.value.split('\n')
+      : null;
+  } while (
+    token.type === 'JSXText'
+        && /^\s*$/.test(lines[lines.length - 1])
+  );
+  return token;
+}
+
+/**
+ * Checks if the node is the first in its line, excluding whitespace.
+ * @param {Object} context The node to check
+ * @param {ASTNode} node The node to check
+ * @return {Boolean} true if it's the first node in its line
+ */
+function isNodeFirstInLine(context, node) {
+  const token = getFirstNodeInLine(context, node);
+  const startLine = node.loc.start.line;
+  const endLine = token ? token.loc.end.line : -1;
+  return startLine !== endLine;
+}
+
+/**
+ * Checks if the node is a function or arrow function expression.
+ * @param {ASTNode} node The node to check
+ * @return {Boolean} true if it's a function-like expression
+ */
+function isFunctionLikeExpression(node) {
+  return node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression';
+}
+
+/**
+ * Checks if the node is a function.
+ * @param {ASTNode} node The node to check
+ * @return {Boolean} true if it's a function
+ */
+function isFunction(node) {
+  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration';
+}
+
+/**
+ * Checks if the node is a class.
+ * @param {ASTNode} node The node to check
+ * @return {Boolean} true if it's a class
+ */
+function isClass(node) {
+  return node.type === 'ClassDeclaration' || node.type === 'ClassExpression';
+}
+
+/**
+ * Removes quotes from around an identifier.
+ * @param {string} string the identifier to strip
+ * @returns {string}
+ */
+function stripQuotes(string) {
+  return string.replace(/^'|'$/g, '');
+}
+
+/**
+ * Retrieve the name of a key node
+ * @param {Context} context The AST node with the key.
+ * @param {ASTNode} node The AST node with the key.
+ * @return {string | undefined} the name of the key
+ */
+function getKeyValue(context, node) {
+  if (node.type === 'ObjectTypeProperty') {
+    const tokens = context.getFirstTokens(node, 2);
+    return (tokens[0].value === '+' || tokens[0].value === '-'
+      ? tokens[1].value
+      : stripQuotes(tokens[0].value)
+    );
+  }
+  if (node.type === 'GenericTypeAnnotation') {
+    return node.id.name;
+  }
+  if (node.type === 'ObjectTypeAnnotation') {
+    return;
+  }
+  const key = node.key || node.argument;
+  if (!key) {
+    return;
+  }
+  return key.type === 'Identifier' ? key.name : key.value;
+}
+
+/**
+ * Checks if a node is being assigned a value: props.bar = 'bar'
+ * @param {ASTNode} node The AST node being checked.
+ * @returns {Boolean}
+ */
+function isAssignmentLHS(node) {
+  return (
+    node.parent
+    && node.parent.type === 'AssignmentExpression'
+    && node.parent.left === node
+  );
+}
+
+/**
+ * Extracts the expression node that is wrapped inside a TS type assertion
+ *
+ * @param {ASTNode} node - potential TS node
+ * @returns {ASTNode} - unwrapped expression node
+ */
+function unwrapTSAsExpression(node) {
+  if (node && node.type === 'TSAsExpression') return node.expression;
+  return node;
+}
+
+function isTSTypeReference(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeReference';
+}
+
+function isTSTypeAnnotation(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeAnnotation';
+}
+
+function isTSTypeLiteral(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeLiteral';
+}
+
+function isTSIntersectionType(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSIntersectionType';
+}
+
+function isTSInterfaceHeritage(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSInterfaceHeritage';
+}
+
+function isTSInterfaceDeclaration(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSInterfaceDeclaration';
+}
+
+function isTSTypeAliasDeclaration(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeAliasDeclaration';
+}
+
+function isTSParenthesizedType(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeAliasDeclaration';
+}
+
+function isTSFunctionType(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSFunctionType';
+}
+
+function isTSTypeQuery(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeQuery';
+}
+
+function isTSTypeParameterInstantiation(node) {
+  if (!node) return false;
+  const nodeType = node.type;
+  return nodeType === 'TSTypeParameterInstantiation';
+}
+
+module.exports = {
+  traverse,
+  findReturnStatement,
+  getFirstNodeInLine,
+  getPropertyName,
+  getPropertyNameNode,
+  getComponentProperties,
+  getKeyValue,
+  isAssignmentLHS,
+  isClass,
+  isFunction,
+  isFunctionLikeExpression,
+  isNodeFirstInLine,
+  unwrapTSAsExpression,
+  traverseReturns,
+  isTSTypeReference,
+  isTSTypeAnnotation,
+  isTSTypeLiteral,
+  isTSIntersectionType,
+  isTSInterfaceHeritage,
+  isTSInterfaceDeclaration,
+  isTSTypeAliasDeclaration,
+  isTSParenthesizedType,
+  isTSFunctionType,
+  isTSTypeQuery,
+  isTSTypeParameterInstantiation
+};

node_modules/eslint-plugin-react/lib/util/defaultProps.js

@@ -0,0 +1,267 @@
+/**
+ * @fileoverview Common defaultProps detection functionality.
+ */
+
+'use strict';
+
+const fromEntries = require('object.fromentries');
+const astUtil = require('./ast');
+const propsUtil = require('./props');
+const variableUtil = require('./variable');
+const propWrapperUtil = require('./propWrapper');
+
+const QUOTES_REGEX = /^["']|["']$/g;
+
+module.exports = function defaultPropsInstructions(context, components, utils) {
+  const sourceCode = context.getSourceCode();
+
+  /**
+   * Try to resolve the node passed in to a variable in the current scope. If the node passed in is not
+   * an Identifier, then the node is simply returned.
+   * @param   {ASTNode} node The node to resolve.
+   * @returns {ASTNode|null} Return null if the value could not be resolved, ASTNode otherwise.
+   */
+  function resolveNodeValue(node) {
+    if (node.type === 'Identifier') {
+      return variableUtil.findVariableByName(context, node.name);
+    }
+    if (
+      node.type === 'CallExpression'
+      && propWrapperUtil.isPropWrapperFunction(context, node.callee.name)
+      && node.arguments && node.arguments[0]
+    ) {
+      return resolveNodeValue(node.arguments[0]);
+    }
+    return node;
+  }
+
+  /**
+   * Extracts a DefaultProp from an ObjectExpression node.
+   * @param   {ASTNode} objectExpression ObjectExpression node.
+   * @returns {Object|string}            Object representation of a defaultProp, to be consumed by
+   *                                     `addDefaultPropsToComponent`, or string "unresolved", if the defaultProps
+   *                                     from this ObjectExpression can't be resolved.
+   */
+  function getDefaultPropsFromObjectExpression(objectExpression) {
+    const hasSpread = objectExpression.properties.find((property) => property.type === 'ExperimentalSpreadProperty' || property.type === 'SpreadElement');
+
+    if (hasSpread) {
+      return 'unresolved';
+    }
+
+    return objectExpression.properties.map((defaultProp) => ({
+      name: sourceCode.getText(defaultProp.key).replace(QUOTES_REGEX, ''),
+      node: defaultProp
+    }));
+  }
+
+  /**
+   * Marks a component's DefaultProps declaration as "unresolved". A component's DefaultProps is
+   * marked as "unresolved" if we cannot safely infer the values of its defaultProps declarations
+   * without risking false negatives.
+   * @param   {Object} component The component to mark.
+   * @returns {void}
+   */
+  function markDefaultPropsAsUnresolved(component) {
+    components.set(component.node, {
+      defaultProps: 'unresolved'
+    });
+  }
+
+  /**
+   * Adds defaultProps to the component passed in.
+   * @param   {ASTNode}         component    The component to add the defaultProps to.
+   * @param   {Object[]|'unresolved'} defaultProps defaultProps to add to the component or the string "unresolved"
+   *                                         if this component has defaultProps that can't be resolved.
+   * @returns {void}
+   */
+  function addDefaultPropsToComponent(component, defaultProps) {
+    // Early return if this component's defaultProps is already marked as "unresolved".
+    if (component.defaultProps === 'unresolved') {
+      return;
+    }
+
+    if (defaultProps === 'unresolved') {
+      markDefaultPropsAsUnresolved(component);
+      return;
+    }
+
+    const defaults = component.defaultProps || {};
+    const newDefaultProps = Object.assign(
+      {},
+      defaults,
+      fromEntries(defaultProps.map((prop) => [prop.name, prop]))
+    );
+
+    components.set(component.node, {
+      defaultProps: newDefaultProps
+    });
+  }
+
+  return {
+    MemberExpression(node) {
+      const isDefaultProp = propsUtil.isDefaultPropsDeclaration(node);
+
+      if (!isDefaultProp) {
+        return;
+      }
+
+      // find component this defaultProps belongs to
+      const component = utils.getRelatedComponent(node);
+      if (!component) {
+        return;
+      }
+
+      // e.g.:
+      // MyComponent.propTypes = {
+      //   foo: React.PropTypes.string.isRequired,
+      //   bar: React.PropTypes.string
+      // };
+      //
+      // or:
+      //
+      // MyComponent.propTypes = myPropTypes;
+      if (node.parent.type === 'AssignmentExpression') {
+        const expression = resolveNodeValue(node.parent.right);
+        if (!expression || expression.type !== 'ObjectExpression') {
+          // If a value can't be found, we mark the defaultProps declaration as "unresolved", because
+          // we should ignore this component and not report any errors for it, to avoid false-positives
+          // with e.g. external defaultProps declarations.
+          if (isDefaultProp) {
+            markDefaultPropsAsUnresolved(component);
+          }
+
+          return;
+        }
+
+        addDefaultPropsToComponent(component, getDefaultPropsFromObjectExpression(expression));
+
+        return;
+      }
+
+      // e.g.:
+      // MyComponent.propTypes.baz = React.PropTypes.string;
+      if (node.parent.type === 'MemberExpression' && node.parent.parent
+        && node.parent.parent.type === 'AssignmentExpression') {
+        addDefaultPropsToComponent(component, [{
+          name: node.parent.property.name,
+          node: node.parent.parent
+        }]);
+      }
+    },
+
+    // e.g.:
+    // class Hello extends React.Component {
+    //   static get defaultProps() {
+    //     return {
+    //       name: 'Dean'
+    //     };
+    //   }
+    //   render() {
+    //     return <div>Hello {this.props.name}</div>;
+    //   }
+    // }
+    MethodDefinition(node) {
+      if (!node.static || node.kind !== 'get') {
+        return;
+      }
+
+      if (!propsUtil.isDefaultPropsDeclaration(node)) {
+        return;
+      }
+
+      // find component this propTypes/defaultProps belongs to
+      const component = components.get(utils.getParentES6Component());
+      if (!component) {
+        return;
+      }
+
+      const returnStatement = utils.findReturnStatement(node);
+      if (!returnStatement) {
+        return;
+      }
+
+      const expression = resolveNodeValue(returnStatement.argument);
+      if (!expression || expression.type !== 'ObjectExpression') {
+        return;
+      }
+
+      addDefaultPropsToComponent(component, getDefaultPropsFromObjectExpression(expression));
+    },
+
+    // e.g.:
+    // class Greeting extends React.Component {
+    //   render() {
+    //     return (
+    //       <h1>Hello, {this.props.foo} {this.props.bar}</h1>
+    //     );
+    //   }
+    //   static defaultProps = {
+    //     foo: 'bar',
+    //     bar: 'baz'
+    //   };
+    // }
+    ClassProperty(node) {
+      if (!(node.static && node.value)) {
+        return;
+      }
+
+      const propName = astUtil.getPropertyName(node);
+      const isDefaultProp = propName === 'defaultProps' || propName === 'getDefaultProps';
+
+      if (!isDefaultProp) {
+        return;
+      }
+
+      // find component this propTypes/defaultProps belongs to
+      const component = components.get(utils.getParentES6Component());
+      if (!component) {
+        return;
+      }
+
+      const expression = resolveNodeValue(node.value);
+      if (!expression || expression.type !== 'ObjectExpression') {
+        return;
+      }
+
+      addDefaultPropsToComponent(component, getDefaultPropsFromObjectExpression(expression));
+    },
+
+    // e.g.:
+    // React.createClass({
+    //   render: function() {
+    //     return <div>{this.props.foo}</div>;
+    //   },
+    //   getDefaultProps: function() {
+    //     return {
+    //       foo: 'default'
+    //     };
+    //   }
+    // });
+    ObjectExpression(node) {
+      // find component this propTypes/defaultProps belongs to
+      const component = utils.isES5Component(node) && components.get(node);
+      if (!component) {
+        return;
+      }
+
+      // Search for the proptypes declaration
+      node.properties.forEach((property) => {
+        if (property.type === 'ExperimentalSpreadProperty' || property.type === 'SpreadElement') {
+          return;
+        }
+
+        const isDefaultProp = propsUtil.isDefaultPropsDeclaration(property);
+
+        if (isDefaultProp && property.value.type === 'FunctionExpression') {
+          const returnStatement = utils.findReturnStatement(property);
+          if (!returnStatement || returnStatement.argument.type !== 'ObjectExpression') {
+            return;
+          }
+
+          addDefaultPropsToComponent(component, getDefaultPropsFromObjectExpression(returnStatement.argument));
+        }
+      });
+    }
+  };
+};

node_modules/eslint-plugin-react/lib/util/docsUrl.js

@@ -0,0 +1,7 @@
+'use strict';
+
+function docsUrl(ruleName) {
+  return `https://github.com/yannickcr/eslint-plugin-react/tree/master/docs/rules/${ruleName}.md`;
+}
+
+module.exports = docsUrl;

node_modules/eslint-plugin-react/lib/util/error.js

@@ -0,0 +1,14 @@
+'use strict';
+
+/**
+ * Logs out a message if there is no format option set.
+ * @param {String} message - Message to log.
+ */
+function error(message) {
+  if (!/=-(f|-format)=/.test(process.argv.join('='))) {
+    // eslint-disable-next-line no-console
+    console.error(message);
+  }
+}
+
+module.exports = error;

node_modules/eslint-plugin-react/lib/util/getTokenBeforeClosingBracket.js

@@ -0,0 +1,16 @@
+'use strict';
+
+/**
+ * Find the token before the closing bracket.
+ * @param {ASTNode} node - The JSX element node.
+ * @returns {Token} The token before the closing bracket.
+ */
+function getTokenBeforeClosingBracket(node) {
+  const attributes = node.attributes;
+  if (attributes.length === 0) {
+    return node.name;
+  }
+  return attributes[attributes.length - 1];
+}
+
+module.exports = getTokenBeforeClosingBracket;

node_modules/eslint-plugin-react/lib/util/isFirstLetterCapitalized.js

@@ -0,0 +1,16 @@
+'use strict';
+
+/**
+ * Check if the first letter of a string is capitalized.
+ * @param {String} word String to check
+ * @returns {Boolean} True if first letter is capitalized.
+ */
+function isFirstLetterCapitalized(word) {
+  if (!word) {
+    return false;
+  }
+  const firstLetter = word.charAt(0);
+  return firstLetter.toUpperCase() === firstLetter;
+}
+
+module.exports = isFirstLetterCapitalized;

node_modules/eslint-plugin-react/lib/util/jsx.js

@@ -0,0 +1,157 @@
+/**
+ * @fileoverview Utility functions for JSX
+ */
+
+'use strict';
+
+const estraverse = require('estraverse');
+const elementType = require('jsx-ast-utils/elementType');
+
+const astUtil = require('./ast');
+
+// See https://github.com/babel/babel/blob/ce420ba51c68591e057696ef43e028f41c6e04cd/packages/babel-types/src/validators/react/isCompatTag.js
+// for why we only test for the first character
+const COMPAT_TAG_REGEX = /^[a-z]/;
+
+/**
+ * Checks if a node represents a DOM element according to React.
+ * @param {object} node - JSXOpeningElement to check.
+ * @returns {boolean} Whether or not the node corresponds to a DOM element.
+ */
+function isDOMComponent(node) {
+  const name = elementType(node);
+  return COMPAT_TAG_REGEX.test(name);
+}
+
+/**
+ * Test whether a JSXElement is a fragment
+ * @param {JSXElement} node
+ * @param {string} reactPragma
+ * @param {string} fragmentPragma
+ * @returns {boolean}
+ */
+function isFragment(node, reactPragma, fragmentPragma) {
+  const name = node.openingElement.name;
+
+  // <Fragment>
+  if (name.type === 'JSXIdentifier' && name.name === fragmentPragma) {
+    return true;
+  }
+
+  // <React.Fragment>
+  if (
+    name.type === 'JSXMemberExpression'
+    && name.object.type === 'JSXIdentifier'
+    && name.object.name === reactPragma
+    && name.property.type === 'JSXIdentifier'
+    && name.property.name === fragmentPragma
+  ) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Checks if a node represents a JSX element or fragment.
+ * @param {object} node - node to check.
+ * @returns {boolean} Whether or not the node if a JSX element or fragment.
+ */
+function isJSX(node) {
+  return node && ['JSXElement', 'JSXFragment'].indexOf(node.type) >= 0;
+}
+
+/**
+ * Check if node is like `key={...}` as in `<Foo key={...} />`
+ * @param {ASTNode} node
+ * @returns {boolean}
+ */
+function isJSXAttributeKey(node) {
+  return node.type === 'JSXAttribute'
+    && node.name
+    && node.name.type === 'JSXIdentifier'
+    && node.name.name === 'key';
+}
+
+/**
+ * Check if value has only whitespaces
+ * @param {string} value
+ * @returns {boolean}
+ */
+function isWhiteSpaces(value) {
+  return typeof value === 'string' ? /^\s*$/.test(value) : false;
+}
+
+/**
+ * Check if the node is returning JSX or null
+ *
+ * @param {Function} isCreateElement Function to determine if a CallExpresion is
+ *   a createElement one
+ * @param {ASTNode} ASTnode The AST node being checked
+ * @param {Context} context The context of `ASTNode`.
+ * @param {Boolean} [strict] If true, in a ternary condition the node must return JSX in both cases
+ * @param {Boolean} [ignoreNull] If true, null return values will be ignored
+ * @returns {Boolean} True if the node is returning JSX or null, false if not
+ */
+function isReturningJSX(isCreateElement, ASTnode, context, strict, ignoreNull) {
+  let found = false;
+  astUtil.traverseReturns(ASTnode, context, (node) => {
+    // Traverse return statement
+    astUtil.traverse(node, {
+      enter(childNode) {
+        const setFound = () => {
+          found = true;
+          this.skip();
+        };
+        switch (childNode.type) {
+          case 'FunctionExpression':
+          case 'FunctionDeclaration':
+          case 'ArrowFunctionExpression':
+            // Do not traverse into inner function definitions
+            return this.skip();
+          case 'ConditionalExpression':
+            if (!strict) break;
+            if (isJSX(childNode.consequent) && isJSX(childNode.alternate)) {
+              setFound();
+            }
+            this.skip();
+            break;
+          case 'LogicalExpression':
+            if (!strict) break;
+            if (isJSX(childNode.left) && isJSX(childNode.right)) {
+              setFound();
+            }
+            this.skip();
+            break;
+          case 'JSXElement':
+          case 'JSXFragment':
+            setFound(); break;
+          case 'CallExpression':
+            if (isCreateElement(childNode)) {
+              setFound();
+            }
+            break;
+          case 'Literal':
+            if (!ignoreNull && childNode.value === null) {
+              setFound();
+            }
+            break;
+          default:
+        }
+      }
+    });
+
+    return found && estraverse.VisitorOption.Break;
+  });
+
+  return found;
+}
+
+module.exports = {
+  isDOMComponent,
+  isFragment,
+  isJSX,
+  isJSXAttributeKey,
+  isWhiteSpaces,
+  isReturningJSX
+};

node_modules/eslint-plugin-react/lib/util/linkComponents.js

@@ -0,0 +1,46 @@
+/**
+ * @fileoverview Utility functions for propWrapperFunctions setting
+ */
+
+'use strict';
+
+/** TODO: type {(string | { name: string, linkAttribute: string })[]} */
+/** @type {any} */
+const DEFAULT_LINK_COMPONENTS = ['a'];
+const DEFAULT_LINK_ATTRIBUTE = 'href';
+
+/** TODO: type {(string | { name: string, formAttribute: string })[]} */
+/** @type {any} */
+const DEFAULT_FORM_COMPONENTS = ['form'];
+const DEFAULT_FORM_ATTRIBUTE = 'action';
+
+function getFormComponents(context) {
+  const settings = context.settings || {};
+  const formComponents = /** @type {typeof DEFAULT_FORM_COMPONENTS} */ (
+    DEFAULT_FORM_COMPONENTS.concat(settings.formComponents || [])
+  );
+  return new Map(formComponents.map((value) => {
+    if (typeof value === 'string') {
+      return [value, DEFAULT_FORM_ATTRIBUTE];
+    }
+    return [value.name, value.formAttribute];
+  }));
+}
+
+function getLinkComponents(context) {
+  const settings = context.settings || {};
+  const linkComponents = /** @type {typeof DEFAULT_LINK_COMPONENTS} */ (
+    DEFAULT_LINK_COMPONENTS.concat(settings.linkComponents || [])
+  );
+  return new Map(linkComponents.map((value) => {
+    if (typeof value === 'string') {
+      return [value, DEFAULT_LINK_ATTRIBUTE];
+    }
+    return [value.name, value.linkAttribute];
+  }));
+}
+
+module.exports = {
+  getFormComponents,
+  getLinkComponents
+};

node_modules/eslint-plugin-react/lib/util/log.js

@@ -0,0 +1,14 @@
+'use strict';
+
+/**
+ * Logs out a message if there is no format option set.
+ * @param {String} message - Message to log.
+ */
+function log(message) {
+  if (!/=-(f|-format)=/.test(process.argv.join('='))) {
+    // eslint-disable-next-line no-console
+    console.log(message);
+  }
+}
+
+module.exports = log;

node_modules/eslint-plugin-react/lib/util/makeNoMethodSetStateRule.js

@@ -0,0 +1,104 @@
+/**
+ * @fileoverview Prevent usage of setState in lifecycle methods
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const docsUrl = require('./docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+function mapTitle(methodName) {
+  const map = {
+    componentDidMount: 'did-mount',
+    componentDidUpdate: 'did-update',
+    componentWillUpdate: 'will-update'
+  };
+  const title = map[methodName];
+  if (!title) {
+    throw Error(`No docsUrl for '${methodName}'`);
+  }
+  return `no-${title}-set-state`;
+}
+
+function makeNoMethodSetStateRule(methodName, shouldCheckUnsafeCb) {
+  return {
+    meta: {
+      docs: {
+        description: `Prevent usage of setState in ${methodName}`,
+        category: 'Best Practices',
+        recommended: false,
+        url: docsUrl(mapTitle(methodName))
+      },
+
+      messages: {
+        noSetState: 'Do not use setState in {{name}}'
+      },
+
+      schema: [{
+        enum: ['disallow-in-func']
+      }]
+    },
+
+    create(context) {
+      const mode = context.options[0] || 'allow-in-func';
+
+      function nameMatches(name) {
+        if (name === methodName) {
+          return true;
+        }
+
+        if (typeof shouldCheckUnsafeCb === 'function' && shouldCheckUnsafeCb(context)) {
+          return name === `UNSAFE_${methodName}`;
+        }
+
+        return false;
+      }
+
+      // --------------------------------------------------------------------------
+      // Public
+      // --------------------------------------------------------------------------
+
+      return {
+
+        CallExpression(node) {
+          const callee = node.callee;
+          if (
+            callee.type !== 'MemberExpression'
+            || callee.object.type !== 'ThisExpression'
+            || callee.property.name !== 'setState'
+          ) {
+            return;
+          }
+          const ancestors = context.getAncestors(callee).reverse();
+          let depth = 0;
+          ancestors.some((ancestor) => {
+            if (/Function(Expression|Declaration)$/.test(ancestor.type)) {
+              depth++;
+            }
+            if (
+              (ancestor.type !== 'Property' && ancestor.type !== 'MethodDefinition' && ancestor.type !== 'ClassProperty')
+              || !nameMatches(ancestor.key.name)
+              || (mode !== 'disallow-in-func' && depth > 1)
+            ) {
+              return false;
+            }
+            context.report({
+              node: callee,
+              messageId: 'noSetState',
+              data: {
+                name: ancestor.key.name
+              }
+            });
+            return true;
+          });
+        }
+      };
+    }
+  };
+}
+
+module.exports = makeNoMethodSetStateRule;

node_modules/eslint-plugin-react/lib/util/pragma.js

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview Utility functions for React pragma configuration
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const JSX_ANNOTATION_REGEX = /@jsx\s+([^\s]+)/;
+// Does not check for reserved keywords or unicode characters
+const JS_IDENTIFIER_REGEX = /^[_$a-zA-Z][_$a-zA-Z0-9]*$/;
+
+function getCreateClassFromContext(context) {
+  let pragma = 'createReactClass';
+  // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+  if (context.settings.react && context.settings.react.createClass) {
+    pragma = context.settings.react.createClass;
+  }
+  if (!JS_IDENTIFIER_REGEX.test(pragma)) {
+    throw new Error(`createClass pragma ${pragma} is not a valid function name`);
+  }
+  return pragma;
+}
+
+function getFragmentFromContext(context) {
+  let pragma = 'Fragment';
+  // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+  if (context.settings.react && context.settings.react.fragment) {
+    pragma = context.settings.react.fragment;
+  }
+  if (!JS_IDENTIFIER_REGEX.test(pragma)) {
+    throw new Error(`Fragment pragma ${pragma} is not a valid identifier`);
+  }
+  return pragma;
+}
+
+function getFromContext(context) {
+  let pragma = 'React';
+
+  const sourceCode = context.getSourceCode();
+  const pragmaNode = sourceCode.getAllComments().find((node) => JSX_ANNOTATION_REGEX.test(node.value));
+
+  if (pragmaNode) {
+    const matches = JSX_ANNOTATION_REGEX.exec(pragmaNode.value);
+    pragma = matches[1].split('.')[0];
+    // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+  } else if (context.settings.react && context.settings.react.pragma) {
+    pragma = context.settings.react.pragma;
+  }
+
+  if (!JS_IDENTIFIER_REGEX.test(pragma)) {
+    throw new Error(`React pragma ${pragma} is not a valid identifier`);
+  }
+  return pragma;
+}
+
+module.exports = {
+  getCreateClassFromContext,
+  getFragmentFromContext,
+  getFromContext
+};

node_modules/eslint-plugin-react/lib/util/propTypesSort.js

@@ -0,0 +1,164 @@
+/**
+ * @fileoverview Common propTypes sorting functionality.
+ */
+
+'use strict';
+
+const astUtil = require('./ast');
+
+/**
+ * Returns the value name of a node.
+ *
+ * @param {ASTNode} node the node to check.
+ * @returns {String} The name of the node.
+ */
+function getValueName(node) {
+  return node.type === 'Property' && node.value.property && node.value.property.name;
+}
+
+/**
+ * Checks if the prop is required or not.
+ *
+ * @param {ASTNode} node the prop to check.
+ * @returns {Boolean} true if the prop is required.
+ */
+function isRequiredProp(node) {
+  return getValueName(node) === 'isRequired';
+}
+
+/**
+ * Checks if the proptype is a callback by checking if it starts with 'on'.
+ *
+ * @param {String} propName the name of the proptype to check.
+ * @returns {Boolean} true if the proptype is a callback.
+ */
+function isCallbackPropName(propName) {
+  return /^on[A-Z]/.test(propName);
+}
+
+/**
+ * Checks if the prop is PropTypes.shape.
+ *
+ * @param {ASTNode} node the prop to check.
+ * @returns {Boolean} true if the prop is PropTypes.shape.
+ */
+function isShapeProp(node) {
+  return Boolean(
+    node && node.callee && node.callee.property && node.callee.property.name === 'shape'
+  );
+}
+
+/**
+ * Returns the properties of a PropTypes.shape.
+ *
+ * @param {ASTNode} node the prop to check.
+ * @returns {Array} the properties of the PropTypes.shape node.
+ */
+function getShapeProperties(node) {
+  return node.arguments && node.arguments[0] && node.arguments[0].properties;
+}
+
+/**
+ * Compares two elements.
+ *
+ * @param {ASTNode} a the first element to compare.
+ * @param {ASTNode} b the second element to compare.
+ * @param {Context} context The context of the two nodes.
+ * @param {Boolean=} ignoreCase whether or not to ignore case when comparing the two elements.
+ * @param {Boolean=} requiredFirst whether or not to sort required elements first.
+ * @param {Boolean=} callbacksLast whether or not to sort callbacks after everyting else.
+ * @returns {Number} the sort order of the two elements.
+ */
+function sorter(a, b, context, ignoreCase, requiredFirst, callbacksLast) {
+  const aKey = String(astUtil.getKeyValue(context, a));
+  const bKey = String(astUtil.getKeyValue(context, b));
+
+  if (requiredFirst) {
+    if (isRequiredProp(a) && !isRequiredProp(b)) {
+      return -1;
+    }
+    if (!isRequiredProp(a) && isRequiredProp(b)) {
+      return 1;
+    }
+  }
+
+  if (callbacksLast) {
+    if (isCallbackPropName(aKey) && !isCallbackPropName(bKey)) {
+      return 1;
+    }
+    if (!isCallbackPropName(aKey) && isCallbackPropName(bKey)) {
+      return -1;
+    }
+  }
+
+  if (ignoreCase) {
+    return aKey.localeCompare(bKey);
+  }
+
+  if (aKey < bKey) {
+    return -1;
+  }
+  if (aKey > bKey) {
+    return 1;
+  }
+  return 0;
+}
+
+/**
+ * Fixes sort order of prop types.
+ *
+ * @param {Fixer} fixer the first element to compare.
+ * @param {Object} context the second element to compare.
+ * @param {Array} declarations The context of the two nodes.
+ * @param {Boolean=} ignoreCase whether or not to ignore case when comparing the two elements.
+ * @param {Boolean=} requiredFirst whether or not to sort required elements first.
+ * @param {Boolean=} callbacksLast whether or not to sort callbacks after everyting else.
+ * @param {Boolean=} sortShapeProp whether or not to sort propTypes defined in PropTypes.shape.
+ * @returns {Object|*|{range, text}} the sort order of the two elements.
+ */
+function fixPropTypesSort(fixer, context, declarations, ignoreCase, requiredFirst, callbacksLast, sortShapeProp) {
+  function sortInSource(allNodes, source) {
+    const originalSource = source;
+    const nodeGroups = allNodes.reduce((acc, curr) => {
+      if (curr.type === 'ExperimentalSpreadProperty' || curr.type === 'SpreadElement') {
+        acc.push([]);
+      } else {
+        acc[acc.length - 1].push(curr);
+      }
+      return acc;
+    }, [[]]);
+
+    nodeGroups.forEach((nodes) => {
+      const sortedAttributes = nodes
+        .slice()
+        .sort((a, b) => sorter(a, b, context, ignoreCase, requiredFirst, callbacksLast));
+
+      source = nodes.reduceRight((acc, attr, index) => {
+        const sortedAttr = sortedAttributes[index];
+        let sortedAttrText = context.getSourceCode().getText(sortedAttr);
+        if (sortShapeProp && isShapeProp(sortedAttr.value)) {
+          const shape = getShapeProperties(sortedAttr.value);
+          if (shape) {
+            const attrSource = sortInSource(
+              shape,
+              originalSource
+            );
+            sortedAttrText = attrSource.slice(sortedAttr.range[0], sortedAttr.range[1]);
+          }
+        }
+        return `${acc.slice(0, attr.range[0])}${sortedAttrText}${acc.slice(attr.range[1])}`;
+      }, source);
+    });
+    return source;
+  }
+
+  const source = sortInSource(declarations, context.getSourceCode().getText());
+
+  const rangeStart = declarations[0].range[0];
+  const rangeEnd = declarations[declarations.length - 1].range[1];
+  return fixer.replaceTextRange([rangeStart, rangeEnd], source.slice(rangeStart, rangeEnd));
+}
+
+module.exports = {
+  fixPropTypesSort
+};

node_modules/eslint-plugin-react/lib/util/propWrapper.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview Utility functions for propWrapperFunctions setting
+ */
+
+'use strict';
+
+function searchPropWrapperFunctions(name, propWrapperFunctions) {
+  const splitName = name.split('.');
+  return Array.from(propWrapperFunctions).some((func) => {
+    if (splitName.length === 2 && func.object === splitName[0] && func.property === splitName[1]) {
+      return true;
+    }
+    return name === func || func.property === name;
+  });
+}
+
+function getPropWrapperFunctions(context) {
+  return new Set(context.settings.propWrapperFunctions || []);
+}
+
+function isPropWrapperFunction(context, name) {
+  if (typeof name !== 'string') {
+    return false;
+  }
+  const propWrapperFunctions = getPropWrapperFunctions(context);
+  return searchPropWrapperFunctions(name, propWrapperFunctions);
+}
+
+function getExactPropWrapperFunctions(context) {
+  const propWrapperFunctions = getPropWrapperFunctions(context);
+  const exactPropWrappers = Array.from(propWrapperFunctions).filter((func) => func.exact === true);
+  return new Set(exactPropWrappers);
+}
+
+function isExactPropWrapperFunction(context, name) {
+  const exactPropWrappers = getExactPropWrapperFunctions(context);
+  return searchPropWrapperFunctions(name, exactPropWrappers);
+}
+
+function formatPropWrapperFunctions(propWrapperFunctions) {
+  return Array.from(propWrapperFunctions, (func) => {
+    if (func.object && func.property) {
+      return `'${func.object}.${func.property}'`;
+    }
+    if (func.property) {
+      return `'${func.property}'`;
+    }
+    return `'${func}'`;
+  }).join(', ');
+}
+
+module.exports = {
+  formatPropWrapperFunctions,
+  getExactPropWrapperFunctions,
+  getPropWrapperFunctions,
+  isExactPropWrapperFunction,
+  isPropWrapperFunction
+};

node_modules/eslint-plugin-react/lib/util/props.js

@@ -0,0 +1,102 @@
+/**
+ * @fileoverview Utility functions for props
+ */
+
+'use strict';
+
+const astUtil = require('./ast');
+
+/**
+ * Checks if the Identifier node passed in looks like a propTypes declaration.
+ * @param {ASTNode} node The node to check. Must be an Identifier node.
+ * @returns {Boolean} `true` if the node is a propTypes declaration, `false` if not
+ */
+function isPropTypesDeclaration(node) {
+  if (node && node.type === 'ClassProperty') {
+    // Flow support
+    if (node.typeAnnotation && node.key.name === 'props') {
+      return true;
+    }
+  }
+  return astUtil.getPropertyName(node) === 'propTypes';
+}
+
+/**
+ * Checks if the node passed in looks like a contextTypes declaration.
+ * @param {ASTNode} node The node to check.
+ * @returns {Boolean} `true` if the node is a contextTypes declaration, `false` if not
+ */
+function isContextTypesDeclaration(node) {
+  if (node && node.type === 'ClassProperty') {
+    // Flow support
+    if (node.typeAnnotation && node.key.name === 'context') {
+      return true;
+    }
+  }
+  return astUtil.getPropertyName(node) === 'contextTypes';
+}
+
+/**
+ * Checks if the node passed in looks like a contextType declaration.
+ * @param {ASTNode} node The node to check.
+ * @returns {Boolean} `true` if the node is a contextType declaration, `false` if not
+ */
+function isContextTypeDeclaration(node) {
+  return astUtil.getPropertyName(node) === 'contextType';
+}
+
+/**
+ * Checks if the node passed in looks like a childContextTypes declaration.
+ * @param {ASTNode} node The node to check.
+ * @returns {Boolean} `true` if the node is a childContextTypes declaration, `false` if not
+ */
+function isChildContextTypesDeclaration(node) {
+  return astUtil.getPropertyName(node) === 'childContextTypes';
+}
+
+/**
+ * Checks if the Identifier node passed in looks like a defaultProps declaration.
+ * @param {ASTNode} node The node to check. Must be an Identifier node.
+ * @returns {Boolean} `true` if the node is a defaultProps declaration, `false` if not
+ */
+function isDefaultPropsDeclaration(node) {
+  const propName = astUtil.getPropertyName(node);
+  return (propName === 'defaultProps' || propName === 'getDefaultProps');
+}
+
+/**
+ * Checks if we are declaring a display name
+ * @param {ASTNode} node The AST node being checked.
+ * @returns {Boolean} True if we are declaring a display name, false if not.
+ */
+function isDisplayNameDeclaration(node) {
+  switch (node.type) {
+    case 'ClassProperty':
+      return node.key && node.key.name === 'displayName';
+    case 'Identifier':
+      return node.name === 'displayName';
+    case 'Literal':
+      return node.value === 'displayName';
+    default:
+      return false;
+  }
+}
+
+/**
+ * Checks if the PropTypes MemberExpression node passed in declares a required propType.
+ * @param {ASTNode} propTypeExpression node to check. Must be a `PropTypes` MemberExpression.
+ * @returns {Boolean} `true` if this PropType is required, `false` if not.
+ */
+function isRequiredPropType(propTypeExpression) {
+  return propTypeExpression.type === 'MemberExpression' && propTypeExpression.property.name === 'isRequired';
+}
+
+module.exports = {
+  isPropTypesDeclaration,
+  isContextTypesDeclaration,
+  isContextTypeDeclaration,
+  isChildContextTypesDeclaration,
+  isDefaultPropsDeclaration,
+  isDisplayNameDeclaration,
+  isRequiredPropType
+};

node_modules/eslint-plugin-react/lib/util/usedPropTypes.js

@@ -0,0 +1,562 @@
+/**
+ * @fileoverview Common used propTypes detection functionality.
+ */
+
+'use strict';
+
+const astUtil = require('./ast');
+const versionUtil = require('./version');
+const ast = require('./ast');
+
+// ------------------------------------------------------------------------------
+// Constants
+// ------------------------------------------------------------------------------
+
+const LIFE_CYCLE_METHODS = ['componentWillReceiveProps', 'shouldComponentUpdate', 'componentWillUpdate', 'componentDidUpdate'];
+const ASYNC_SAFE_LIFE_CYCLE_METHODS = ['getDerivedStateFromProps', 'getSnapshotBeforeUpdate', 'UNSAFE_componentWillReceiveProps', 'UNSAFE_componentWillUpdate'];
+
+function createPropVariables() {
+  /** @type {Map<string, string[]>} Maps the variable to its definition. `props.a.b` is stored as `['a', 'b']` */
+  let propVariables = new Map();
+  let hasBeenWritten = false;
+  const stack = [{propVariables, hasBeenWritten}];
+  return {
+    pushScope() {
+      // popVariables is not copied until first write.
+      stack.push({propVariables, hasBeenWritten: false});
+    },
+    popScope() {
+      stack.pop();
+      propVariables = stack[stack.length - 1].propVariables;
+      hasBeenWritten = stack[stack.length - 1].hasBeenWritten;
+    },
+    /**
+     * Add a variable name to the current scope
+     * @param {string} name
+     * @param {string[]} allNames Example: `props.a.b` should be formatted as `['a', 'b']`
+     * @returns {Map<string, string[]>}
+     */
+    set(name, allNames) {
+      if (!hasBeenWritten) {
+        // copy on write
+        propVariables = new Map(propVariables);
+        Object.assign(stack[stack.length - 1], {propVariables, hasBeenWritten: true});
+        stack[stack.length - 1].hasBeenWritten = true;
+      }
+      return propVariables.set(name, allNames);
+    },
+    /**
+     * Get the definition of a variable.
+     * @param {string} name
+     * @returns {string[]} Example: `props.a.b` is represented by `['a', 'b']`
+     */
+    get(name) {
+      return propVariables.get(name);
+    }
+  };
+}
+
+/**
+ * Checks if the string is one of `props`, `nextProps`, or `prevProps`
+ * @param {string} name The AST node being checked.
+ * @returns {Boolean} True if the prop name matches
+ */
+function isCommonVariableNameForProps(name) {
+  return name === 'props' || name === 'nextProps' || name === 'prevProps';
+}
+
+/**
+ * Checks if the component must be validated
+ * @param {Object} component The component to process
+ * @returns {Boolean} True if the component must be validated, false if not.
+ */
+function mustBeValidated(component) {
+  return !!(component && !component.ignorePropsValidation);
+}
+
+/**
+ * Check if we are in a lifecycle method
+ * @param {object} context
+ * @param {boolean} checkAsyncSafeLifeCycles
+ * @return {boolean} true if we are in a class constructor, false if not
+ */
+function inLifeCycleMethod(context, checkAsyncSafeLifeCycles) {
+  let scope = context.getScope();
+  while (scope) {
+    if (scope.block && scope.block.parent && scope.block.parent.key) {
+      const name = scope.block.parent.key.name;
+
+      if (LIFE_CYCLE_METHODS.indexOf(name) >= 0) {
+        return true;
+      }
+      if (checkAsyncSafeLifeCycles && ASYNC_SAFE_LIFE_CYCLE_METHODS.indexOf(name) >= 0) {
+        return true;
+      }
+    }
+    scope = scope.upper;
+  }
+  return false;
+}
+
+/**
+ * Returns true if the given node is a React Component lifecycle method
+ * @param {ASTNode} node The AST node being checked.
+ * @param {boolean} checkAsyncSafeLifeCycles
+ * @return {Boolean} True if the node is a lifecycle method
+ */
+function isNodeALifeCycleMethod(node, checkAsyncSafeLifeCycles) {
+  const nodeKeyName = (node.key || /** @type {ASTNode} */ ({})).name;
+
+  if (node.kind === 'constructor') {
+    return true;
+  }
+  if (LIFE_CYCLE_METHODS.indexOf(nodeKeyName) >= 0) {
+    return true;
+  }
+  if (checkAsyncSafeLifeCycles && ASYNC_SAFE_LIFE_CYCLE_METHODS.indexOf(nodeKeyName) >= 0) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Returns true if the given node is inside a React Component lifecycle
+ * method.
+ * @param {ASTNode} node The AST node being checked.
+ * @param {boolean} checkAsyncSafeLifeCycles
+ * @return {Boolean} True if the node is inside a lifecycle method
+ */
+function isInLifeCycleMethod(node, checkAsyncSafeLifeCycles) {
+  if ((node.type === 'MethodDefinition' || node.type === 'Property') && isNodeALifeCycleMethod(node, checkAsyncSafeLifeCycles)) {
+    return true;
+  }
+
+  if (node.parent) {
+    return isInLifeCycleMethod(node.parent, checkAsyncSafeLifeCycles);
+  }
+
+  return false;
+}
+
+/**
+ * Check if a function node is a setState updater
+ * @param {ASTNode} node a function node
+ * @return {boolean}
+ */
+function isSetStateUpdater(node) {
+  const unwrappedParentCalleeNode = node.parent.type === 'CallExpression'
+    && ast.unwrapTSAsExpression(node.parent.callee);
+
+  return unwrappedParentCalleeNode
+    && unwrappedParentCalleeNode.property
+    && unwrappedParentCalleeNode.property.name === 'setState'
+    // Make sure we are in the updater not the callback
+    && node.parent.arguments[0] === node;
+}
+
+function isPropArgumentInSetStateUpdater(context, name) {
+  if (typeof name !== 'string') {
+    return;
+  }
+  let scope = context.getScope();
+  while (scope) {
+    const unwrappedParentCalleeNode = scope.block
+      && scope.block.parent
+      && scope.block.parent.type === 'CallExpression'
+      && ast.unwrapTSAsExpression(scope.block.parent.callee);
+    if (
+      unwrappedParentCalleeNode
+      && unwrappedParentCalleeNode.property
+      && unwrappedParentCalleeNode.property.name === 'setState'
+      // Make sure we are in the updater not the callback
+      && scope.block.parent.arguments[0].range[0] === scope.block.range[0]
+      && scope.block.parent.arguments[0].params
+      && scope.block.parent.arguments[0].params.length > 1
+    ) {
+      return scope.block.parent.arguments[0].params[1].name === name;
+    }
+    scope = scope.upper;
+  }
+  return false;
+}
+
+function isInClassComponent(utils) {
+  return utils.getParentES6Component() || utils.getParentES5Component();
+}
+
+/**
+ * Checks if the node is `this.props`
+ * @param {ASTNode|undefined} node
+ * @returns {boolean}
+ */
+function isThisDotProps(node) {
+  return !!node
+    && node.type === 'MemberExpression'
+    && ast.unwrapTSAsExpression(node.object).type === 'ThisExpression'
+    && node.property.name === 'props';
+}
+
+/**
+ * Checks if the prop has spread operator.
+ * @param {object} context
+ * @param {ASTNode} node The AST node being marked.
+ * @returns {Boolean} True if the prop has spread operator, false if not.
+ */
+function hasSpreadOperator(context, node) {
+  const tokens = context.getSourceCode().getTokens(node);
+  return tokens.length && tokens[0].value === '...';
+}
+
+/**
+ * Checks if the node is a propTypes usage of the form `this.props.*`, `props.*`, `prevProps.*`, or `nextProps.*`.
+ * @param {ASTNode} node
+ * @param {Context} context
+ * @param {Object} utils
+ * @param {boolean} checkAsyncSafeLifeCycles
+ * @returns {boolean}
+ */
+function isPropTypesUsageByMemberExpression(node, context, utils, checkAsyncSafeLifeCycles) {
+  const unwrappedObjectNode = ast.unwrapTSAsExpression(node.object);
+
+  if (isInClassComponent(utils)) {
+    // this.props.*
+    if (isThisDotProps(unwrappedObjectNode)) {
+      return true;
+    }
+    // props.* or prevProps.* or nextProps.*
+    if (
+      isCommonVariableNameForProps(unwrappedObjectNode.name)
+      && (inLifeCycleMethod(context, checkAsyncSafeLifeCycles) || utils.inConstructor())
+    ) {
+      return true;
+    }
+    // this.setState((_, props) => props.*))
+    if (isPropArgumentInSetStateUpdater(context, unwrappedObjectNode.name)) {
+      return true;
+    }
+    return false;
+  }
+  // props.* in function component
+  return unwrappedObjectNode.name === 'props' && !ast.isAssignmentLHS(node);
+}
+
+/**
+ * Retrieve the name of a property node
+ * @param {ASTNode} node The AST node with the property.
+ * @param {Context} context
+ * @param {Object} utils
+ * @param {boolean} checkAsyncSafeLifeCycles
+ * @return {string|undefined} the name of the property or undefined if not found
+ */
+function getPropertyName(node, context, utils, checkAsyncSafeLifeCycles) {
+  const property = node.property;
+  if (property) {
+    switch (property.type) {
+      case 'Identifier':
+        if (node.computed) {
+          return '__COMPUTED_PROP__';
+        }
+        return property.name;
+      case 'MemberExpression':
+        return;
+      case 'Literal':
+        // Accept computed properties that are literal strings
+        if (typeof property.value === 'string') {
+          return property.value;
+        }
+        // Accept number as well but only accept props[123]
+        if (typeof property.value === 'number') {
+          if (isPropTypesUsageByMemberExpression(node, context, utils, checkAsyncSafeLifeCycles)) {
+            return property.raw;
+          }
+        }
+        // falls through
+      default:
+        if (node.computed) {
+          return '__COMPUTED_PROP__';
+        }
+        break;
+    }
+  }
+}
+
+module.exports = function usedPropTypesInstructions(context, components, utils) {
+  const checkAsyncSafeLifeCycles = versionUtil.testReactVersion(context, '16.3.0');
+
+  const propVariables = createPropVariables();
+  const pushScope = propVariables.pushScope;
+  const popScope = propVariables.popScope;
+
+  /**
+   * Mark a prop type as used
+   * @param {ASTNode} node The AST node being marked.
+   * @param {string[]} [parentNames]
+   */
+  function markPropTypesAsUsed(node, parentNames) {
+    parentNames = parentNames || [];
+    let type;
+    let name;
+    let allNames;
+    let properties;
+    switch (node.type) {
+      case 'OptionalMemberExpression':
+      case 'MemberExpression':
+        name = getPropertyName(node, context, utils, checkAsyncSafeLifeCycles);
+        if (name) {
+          allNames = parentNames.concat(name);
+          if (
+            // Match props.foo.bar, don't match bar[props.foo]
+            node.parent.type === 'MemberExpression'
+            && node.parent.object === node
+          ) {
+            markPropTypesAsUsed(node.parent, allNames);
+          }
+          // Handle the destructuring part of `const {foo} = props.a.b`
+          if (
+            node.parent.type === 'VariableDeclarator'
+            && node.parent.id.type === 'ObjectPattern'
+          ) {
+            node.parent.id.parent = node.parent; // patch for bug in eslint@4 in which ObjectPattern has no parent
+            markPropTypesAsUsed(node.parent.id, allNames);
+          }
+
+          // const a = props.a
+          if (
+            node.parent.type === 'VariableDeclarator'
+            && node.parent.id.type === 'Identifier'
+          ) {
+            propVariables.set(node.parent.id.name, allNames);
+          }
+          // Do not mark computed props as used.
+          type = name !== '__COMPUTED_PROP__' ? 'direct' : null;
+        }
+        break;
+      case 'ArrowFunctionExpression':
+      case 'FunctionDeclaration':
+      case 'FunctionExpression': {
+        if (node.params.length === 0) {
+          break;
+        }
+        type = 'destructuring';
+        const propParam = isSetStateUpdater(node) ? node.params[1] : node.params[0];
+        properties = propParam.type === 'AssignmentPattern'
+          ? propParam.left.properties
+          : propParam.properties;
+        break;
+      }
+      case 'ObjectPattern':
+        type = 'destructuring';
+        properties = node.properties;
+        break;
+      case 'TSEmptyBodyFunctionExpression':
+        break;
+      default:
+        throw new Error(`${node.type} ASTNodes are not handled by markPropTypesAsUsed`);
+    }
+
+    const component = components.get(utils.getParentComponent());
+    const usedPropTypes = (component && component.usedPropTypes) || [];
+    let ignoreUnusedPropTypesValidation = (component && component.ignoreUnusedPropTypesValidation) || false;
+
+    switch (type) {
+      case 'direct': {
+        // Ignore Object methods
+        if (name in Object.prototype) {
+          break;
+        }
+
+        const reportedNode = node.property;
+        usedPropTypes.push({
+          name,
+          allNames,
+          node: reportedNode
+        });
+        break;
+      }
+      case 'destructuring': {
+        for (let k = 0, l = (properties || []).length; k < l; k++) {
+          if (hasSpreadOperator(context, properties[k]) || properties[k].computed) {
+            ignoreUnusedPropTypesValidation = true;
+            break;
+          }
+          const propName = ast.getKeyValue(context, properties[k]);
+
+          if (!propName || properties[k].type !== 'Property') {
+            break;
+          }
+
+          usedPropTypes.push({
+            allNames: parentNames.concat([propName]),
+            name: propName,
+            node: properties[k]
+          });
+
+          if (properties[k].value.type === 'ObjectPattern') {
+            markPropTypesAsUsed(properties[k].value, parentNames.concat([propName]));
+          } else if (properties[k].value.type === 'Identifier') {
+            propVariables.set(propName, parentNames.concat(propName));
+          }
+        }
+        break;
+      }
+      default:
+        break;
+    }
+
+    components.set(component ? component.node : node, {
+      usedPropTypes,
+      ignoreUnusedPropTypesValidation
+    });
+  }
+
+  /**
+   * @param {ASTNode} node We expect either an ArrowFunctionExpression,
+   *   FunctionDeclaration, or FunctionExpression
+   */
+  function markDestructuredFunctionArgumentsAsUsed(node) {
+    const param = node.params && isSetStateUpdater(node) ? node.params[1] : node.params[0];
+
+    const destructuring = param && (
+      param.type === 'ObjectPattern'
+      || ((param.type === 'AssignmentPattern') && (param.left.type === 'ObjectPattern'))
+    );
+
+    if (destructuring && (components.get(node) || components.get(node.parent))) {
+      markPropTypesAsUsed(node);
+    }
+  }
+
+  function handleSetStateUpdater(node) {
+    if (!node.params || node.params.length < 2 || !isSetStateUpdater(node)) {
+      return;
+    }
+    markPropTypesAsUsed(node);
+  }
+
+  /**
+   * Handle both stateless functions and setState updater functions.
+   * @param {ASTNode} node We expect either an ArrowFunctionExpression,
+   *   FunctionDeclaration, or FunctionExpression
+   */
+  function handleFunctionLikeExpressions(node) {
+    pushScope();
+    handleSetStateUpdater(node);
+    markDestructuredFunctionArgumentsAsUsed(node);
+  }
+
+  function handleCustomValidators(component) {
+    const propTypes = component.declaredPropTypes;
+    if (!propTypes) {
+      return;
+    }
+
+    Object.keys(propTypes).forEach((key) => {
+      const node = propTypes[key].node;
+
+      if (node.value && astUtil.isFunctionLikeExpression(node.value)) {
+        markPropTypesAsUsed(node.value);
+      }
+    });
+  }
+
+  return {
+    VariableDeclarator(node) {
+      const unwrappedInitNode = ast.unwrapTSAsExpression(node.init);
+
+      // let props = this.props
+      if (isThisDotProps(unwrappedInitNode) && isInClassComponent(utils) && node.id.type === 'Identifier') {
+        propVariables.set(node.id.name, []);
+      }
+
+      // Only handles destructuring
+      if (node.id.type !== 'ObjectPattern' || !unwrappedInitNode) {
+        return;
+      }
+
+      // let {props: {firstname}} = this
+      const propsProperty = node.id.properties.find((property) => (
+        property.key
+        && (property.key.name === 'props' || property.key.value === 'props')
+      ));
+
+      if (unwrappedInitNode.type === 'ThisExpression' && propsProperty && propsProperty.value.type === 'ObjectPattern') {
+        markPropTypesAsUsed(propsProperty.value);
+        return;
+      }
+
+      // let {props} = this
+      if (unwrappedInitNode.type === 'ThisExpression' && propsProperty && propsProperty.value.name === 'props') {
+        propVariables.set('props', []);
+        return;
+      }
+
+      // let {firstname} = props
+      if (
+        isCommonVariableNameForProps(unwrappedInitNode.name)
+        && (utils.getParentStatelessComponent() || isInLifeCycleMethod(node, checkAsyncSafeLifeCycles))
+      ) {
+        markPropTypesAsUsed(node.id);
+        return;
+      }
+
+      // let {firstname} = this.props
+      if (isThisDotProps(unwrappedInitNode) && isInClassComponent(utils)) {
+        markPropTypesAsUsed(node.id);
+        return;
+      }
+
+      // let {firstname} = thing, where thing is defined by const thing = this.props.**.*
+      if (propVariables.get(unwrappedInitNode.name)) {
+        markPropTypesAsUsed(node.id, propVariables.get(unwrappedInitNode.name));
+      }
+    },
+
+    FunctionDeclaration: handleFunctionLikeExpressions,
+
+    ArrowFunctionExpression: handleFunctionLikeExpressions,
+
+    FunctionExpression: handleFunctionLikeExpressions,
+
+    'FunctionDeclaration:exit': popScope,
+
+    'ArrowFunctionExpression:exit': popScope,
+
+    'FunctionExpression:exit': popScope,
+
+    JSXSpreadAttribute(node) {
+      const component = components.get(utils.getParentComponent());
+      components.set(component ? component.node : node, {
+        ignoreUnusedPropTypesValidation: true
+      });
+    },
+
+    'MemberExpression, OptionalMemberExpression'(node) {
+      if (isPropTypesUsageByMemberExpression(node, context, utils, checkAsyncSafeLifeCycles)) {
+        markPropTypesAsUsed(node);
+        return;
+      }
+
+      const propVariable = propVariables.get(ast.unwrapTSAsExpression(node.object).name);
+      if (propVariable) {
+        markPropTypesAsUsed(node, propVariable);
+      }
+    },
+
+    ObjectPattern(node) {
+      // If the object pattern is a destructured props object in a lifecycle
+      // method -- mark it for used props.
+      if (isNodeALifeCycleMethod(node.parent.parent, checkAsyncSafeLifeCycles) && node.properties.length > 0) {
+        markPropTypesAsUsed(node.parent);
+      }
+    },
+
+    'Program:exit'() {
+      const list = components.list();
+
+      Object.keys(list).filter((component) => mustBeValidated(list[component])).forEach((component) => {
+        handleCustomValidators(list[component]);
+      });
+    }
+  };
+};

node_modules/eslint-plugin-react/lib/util/variable.js

@@ -0,0 +1,90 @@
+/**
+ * @fileoverview Utility functions for React components detection
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+/**
+ * Search a particular variable in a list
+ * @param {Array} variables The variables list.
+ * @param {string} name The name of the variable to search.
+ * @returns {Boolean} True if the variable was found, false if not.
+ */
+function findVariable(variables, name) {
+  return variables.some((variable) => variable.name === name);
+}
+
+/**
+ * Find and return a particular variable in a list
+ * @param {Array} variables The variables list.
+ * @param {string} name The name of the variable to search.
+ * @returns {Object} Variable if the variable was found, null if not.
+ */
+function getVariable(variables, name) {
+  return variables.find((variable) => variable.name === name);
+}
+
+/**
+ * List all variable in a given scope
+ *
+ * Contain a patch for babel-eslint to avoid https://github.com/babel/babel-eslint/issues/21
+ *
+ * @param {Object} context The current rule context.
+ * @returns {Array} The variables list
+ */
+function variablesInScope(context) {
+  let scope = context.getScope();
+  let variables = scope.variables;
+
+  while (scope.type !== 'global') {
+    scope = scope.upper;
+    variables = scope.variables.concat(variables);
+  }
+  if (scope.childScopes.length) {
+    variables = scope.childScopes[0].variables.concat(variables);
+    if (scope.childScopes[0].childScopes.length) {
+      variables = scope.childScopes[0].childScopes[0].variables.concat(variables);
+    }
+  }
+  variables.reverse();
+
+  return variables;
+}
+
+/**
+ * Find a variable by name in the current scope.
+ * @param {Object} context The current rule context.
+ * @param  {string} name Name of the variable to look for.
+ * @returns {ASTNode|null} Return null if the variable could not be found, ASTNode otherwise.
+ */
+function findVariableByName(context, name) {
+  const variable = getVariable(variablesInScope(context), name);
+
+  if (!variable || !variable.defs[0] || !variable.defs[0].node) {
+    return null;
+  }
+
+  if (variable.defs[0].node.type === 'TypeAlias') {
+    return variable.defs[0].node.right;
+  }
+
+  return variable.defs[0].node.init;
+}
+
+/**
+ * Returns the latest definition of the variable.
+ * @param {Object} variable
+ * @returns {Object | undefined} The latest variable definition or undefined.
+ */
+function getLatestVariableDefinition(variable) {
+  return variable.defs[variable.defs.length - 1];
+}
+
+module.exports = {
+  findVariable,
+  findVariableByName,
+  getVariable,
+  variablesInScope,
+  getLatestVariableDefinition
+};

node_modules/eslint-plugin-react/lib/util/version.js

@@ -0,0 +1,161 @@
+/**
+ * @fileoverview Utility functions for React and Flow version configuration
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const fs = require('fs');
+const resolve = require('resolve');
+const path = require('path');
+const error = require('./error');
+
+let warnedForMissingVersion = false;
+
+function resetWarningFlag() {
+  warnedForMissingVersion = false;
+}
+
+let cachedDetectedReactVersion;
+
+function resetDetectedVersion() {
+  cachedDetectedReactVersion = undefined;
+}
+
+function resolveBasedir(contextOrFilename) {
+  if (contextOrFilename) {
+    const filename = typeof contextOrFilename === 'string' ? contextOrFilename : contextOrFilename.getFilename();
+    const dirname = path.dirname(filename);
+    try {
+      if (fs.statSync(filename).isFile()) {
+        // dirname must be dir here
+        return dirname;
+      }
+    } catch (err) {
+      // https://github.com/eslint/eslint/issues/11989
+      if (err.code === 'ENOTDIR') {
+        // virtual filename could be recursive
+        return resolveBasedir(dirname);
+      }
+    }
+  }
+  return process.cwd();
+}
+
+// TODO, semver-major: remove context fallback
+function detectReactVersion(context) {
+  if (cachedDetectedReactVersion) {
+    return cachedDetectedReactVersion;
+  }
+
+  const basedir = resolveBasedir(context);
+
+  try {
+    const reactPath = resolve.sync('react', {basedir});
+    const react = require(reactPath); // eslint-disable-line global-require, import/no-dynamic-require
+    cachedDetectedReactVersion = react.version;
+    return cachedDetectedReactVersion;
+  } catch (e) {
+    if (e.code === 'MODULE_NOT_FOUND') {
+      if (!warnedForMissingVersion) {
+        error('Warning: React version was set to "detect" in eslint-plugin-react settings, '
+        + 'but the "react" package is not installed. Assuming latest React version for linting.');
+        warnedForMissingVersion = true;
+      }
+      cachedDetectedReactVersion = '999.999.999';
+      return cachedDetectedReactVersion;
+    }
+    throw e;
+  }
+}
+
+function getReactVersionFromContext(context) {
+  let confVer = '999.999.999';
+  // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+  if (context.settings && context.settings.react && context.settings.react.version) {
+    let settingsVersion = context.settings.react.version;
+    if (settingsVersion === 'detect') {
+      settingsVersion = detectReactVersion(context);
+    }
+    if (typeof settingsVersion !== 'string') {
+      error('Warning: React version specified in eslint-plugin-react-settings must be a string; '
+        + `got “${typeof settingsVersion}”`);
+    }
+    confVer = String(settingsVersion);
+  } else if (!warnedForMissingVersion) {
+    error('Warning: React version not specified in eslint-plugin-react settings. '
+      + 'See https://github.com/yannickcr/eslint-plugin-react#configuration .');
+    warnedForMissingVersion = true;
+  }
+  confVer = /^[0-9]+\.[0-9]+$/.test(confVer) ? `${confVer}.0` : confVer;
+  return confVer.split('.').map((part) => Number(part));
+}
+
+// TODO, semver-major: remove context fallback
+function detectFlowVersion(context) {
+  const basedir = resolveBasedir(context);
+
+  try {
+    const flowPackageJsonPath = resolve.sync('flow-bin/package.json', {basedir});
+    const flowPackageJson = require(flowPackageJsonPath); // eslint-disable-line global-require, import/no-dynamic-require
+    return flowPackageJson.version;
+  } catch (e) {
+    if (e.code === 'MODULE_NOT_FOUND') {
+      error('Warning: Flow version was set to "detect" in eslint-plugin-react settings, '
+        + 'but the "flow-bin" package is not installed. Assuming latest Flow version for linting.');
+      return '999.999.999';
+    }
+    throw e;
+  }
+}
+
+function getFlowVersionFromContext(context) {
+  let confVer = '999.999.999';
+  // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+  if (context.settings.react && context.settings.react.flowVersion) {
+    let flowVersion = context.settings.react.flowVersion;
+    if (flowVersion === 'detect') {
+      flowVersion = detectFlowVersion(context);
+    }
+    if (typeof flowVersion !== 'string') {
+      error('Warning: Flow version specified in eslint-plugin-react-settings must be a string; '
+        + `got “${typeof flowVersion}”`);
+    }
+    confVer = String(flowVersion);
+  } else {
+    throw 'Could not retrieve flowVersion from settings'; // eslint-disable-line no-throw-literal
+  }
+  confVer = /^[0-9]+\.[0-9]+$/.test(confVer) ? `${confVer}.0` : confVer;
+  return confVer.split('.').map((part) => Number(part));
+}
+
+function normalizeParts(parts) {
+  return Array.from({length: 3}, (_, i) => (parts[i] || 0));
+}
+
+function test(context, methodVer, confVer) {
+  const methodVers = normalizeParts(String(methodVer || '').split('.').map((part) => Number(part)));
+  const confVers = normalizeParts(confVer);
+  const higherMajor = methodVers[0] < confVers[0];
+  const higherMinor = methodVers[0] === confVers[0] && methodVers[1] < confVers[1];
+  const higherOrEqualPatch = methodVers[0] === confVers[0]
+    && methodVers[1] === confVers[1]
+    && methodVers[2] <= confVers[2];
+
+  return higherMajor || higherMinor || higherOrEqualPatch;
+}
+
+function testReactVersion(context, methodVer) {
+  return test(context, methodVer, getReactVersionFromContext(context));
+}
+
+function testFlowVersion(context, methodVer) {
+  return test(context, methodVer, getFlowVersionFromContext(context));
+}
+
+module.exports = {
+  testReactVersion,
+  testFlowVersion,
+  resetWarningFlag,
+  resetDetectedVersion
+};