source: imaps-frontend/node_modules/eslint/lib/rules/no-shadow-restricted-names.js

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Last change on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago

Update repo after prototype presentation

  • Property mode set to 100644
File size: 2.2 KB
Line 
1/**
2 * @fileoverview Disallow shadowing of NaN, undefined, and Infinity (ES5 section 15.1.1)
3 * @author Michael Ficarra
4 */
5"use strict";
6
7/**
8 * Determines if a variable safely shadows undefined.
9 * This is the case when a variable named `undefined` is never assigned to a value (i.e. it always shares the same value
10 * as the global).
11 * @param {eslintScope.Variable} variable The variable to check
12 * @returns {boolean} true if this variable safely shadows `undefined`
13 */
14function safelyShadowsUndefined(variable) {
15 return variable.name === "undefined" &&
16 variable.references.every(ref => !ref.isWrite()) &&
17 variable.defs.every(def => def.node.type === "VariableDeclarator" && def.node.init === null);
18}
19
20//------------------------------------------------------------------------------
21// Rule Definition
22//------------------------------------------------------------------------------
23
24/** @type {import('../shared/types').Rule} */
25module.exports = {
26 meta: {
27 type: "suggestion",
28
29 docs: {
30 description: "Disallow identifiers from shadowing restricted names",
31 recommended: true,
32 url: "https://eslint.org/docs/latest/rules/no-shadow-restricted-names"
33 },
34
35 schema: [],
36
37 messages: {
38 shadowingRestrictedName: "Shadowing of global property '{{name}}'."
39 }
40 },
41
42 create(context) {
43
44
45 const RESTRICTED = new Set(["undefined", "NaN", "Infinity", "arguments", "eval"]);
46 const sourceCode = context.sourceCode;
47
48 return {
49 "VariableDeclaration, :function, CatchClause"(node) {
50 for (const variable of sourceCode.getDeclaredVariables(node)) {
51 if (variable.defs.length > 0 && RESTRICTED.has(variable.name) && !safelyShadowsUndefined(variable)) {
52 context.report({
53 node: variable.defs[0].name,
54 messageId: "shadowingRestrictedName",
55 data: {
56 name: variable.name
57 }
58 });
59 }
60 }
61 }
62 };
63
64 }
65};
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