.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/rules/no-func-assign.js

   1 /**
   2  * @fileoverview Rule to flag use of function declaration identifiers as variables.
   3  * @author Ian Christian Myers
   4  */
   5
   6 "use strict";
   7
   8 const astUtils = require("./utils/ast-utils");
   9
  10 //------------------------------------------------------------------------------
  11 // Rule Definition
  12 //------------------------------------------------------------------------------
  13
  14 module.exports = {
  15     meta: {
  16         type: "problem",
  17
  18         docs: {
  19             description: "disallow reassigning `function` declarations",
  20             category: "Possible Errors",
  21             recommended: true,
  22             url: "https://eslint.org/docs/rules/no-func-assign"
  23         },
  24
  25         schema: [],
  26
  27         messages: {
  28             isAFunction: "'{{name}}' is a function."
  29         }
  30     },
  31
  32     create(context) {
  33
  34         /**
  35          * Reports a reference if is non initializer and writable.
  36          * @param {References} references Collection of reference to check.
  37          * @returns {void}
  38          */
  39         function checkReference(references) {
  40             astUtils.getModifyingReferences(references).forEach(reference => {
  41                 context.report({
  42                     node: reference.identifier,
  43                     messageId: "isAFunction",
  44                     data: {
  45                         name: reference.identifier.name
  46                     }
  47                 });
  48             });
  49         }
  50
  51         /**
  52          * Finds and reports references that are non initializer and writable.
  53          * @param {Variable} variable A variable to check.
  54          * @returns {void}
  55          */
  56         function checkVariable(variable) {
  57             if (variable.defs[0].type === "FunctionName") {
  58                 checkReference(variable.references);
  59             }
  60         }
  61
  62         /**
  63          * Checks parameters of a given function node.
  64          * @param {ASTNode} node A function node to check.
  65          * @returns {void}
  66          */
  67         function checkForFunction(node) {
  68             context.getDeclaredVariables(node).forEach(checkVariable);
  69         }
  70
  71         return {
  72             FunctionDeclaration: checkForFunction,
  73             FunctionExpression: checkForFunction
  74         };
  75     }
  76 };