.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/rules/no-confusing-arrow.js

   1 /**
   2  * @fileoverview A rule to warn against using arrow functions when they could be
   3  * confused with comparisons
   4  * @author Jxck <https://github.com/Jxck>
   5  */
   6
   7 "use strict";
   8
   9 const astUtils = require("./utils/ast-utils.js");
  10
  11 //------------------------------------------------------------------------------
  12 // Helpers
  13 //------------------------------------------------------------------------------
  14
  15 /**
  16  * Checks whether or not a node is a conditional expression.
  17  * @param {ASTNode} node node to test
  18  * @returns {boolean} `true` if the node is a conditional expression.
  19  */
  20 function isConditional(node) {
  21     return node && node.type === "ConditionalExpression";
  22 }
  23
  24 //------------------------------------------------------------------------------
  25 // Rule Definition
  26 //------------------------------------------------------------------------------
  27
  28 module.exports = {
  29     meta: {
  30         type: "suggestion",
  31
  32         docs: {
  33             description: "disallow arrow functions where they could be confused with comparisons",
  34             category: "ECMAScript 6",
  35             recommended: false,
  36             url: "https://eslint.org/docs/rules/no-confusing-arrow"
  37         },
  38
  39         fixable: "code",
  40
  41         schema: [{
  42             type: "object",
  43             properties: {
  44                 allowParens: { type: "boolean", default: true }
  45             },
  46             additionalProperties: false
  47         }],
  48
  49         messages: {
  50             confusing: "Arrow function used ambiguously with a conditional expression."
  51         }
  52     },
  53
  54     create(context) {
  55         const config = context.options[0] || {};
  56         const allowParens = config.allowParens || (config.allowParens === void 0);
  57         const sourceCode = context.getSourceCode();
  58
  59
  60         /**
  61          * Reports if an arrow function contains an ambiguous conditional.
  62          * @param {ASTNode} node A node to check and report.
  63          * @returns {void}
  64          */
  65         function checkArrowFunc(node) {
  66             const body = node.body;
  67
  68             if (isConditional(body) && !(allowParens && astUtils.isParenthesised(sourceCode, body))) {
  69                 context.report({
  70                     node,
  71                     messageId: "confusing",
  72                     fix(fixer) {
  73
  74                         // if `allowParens` is not set to true don't bother wrapping in parens
  75                         return allowParens && fixer.replaceText(node.body, `(${sourceCode.getText(node.body)})`);
  76                     }
  77                 });
  78             }
  79         }
  80
  81         return {
  82             ArrowFunctionExpression: checkArrowFunc
  83         };
  84     }
  85 };