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4 |
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5 | "use strict";
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6 |
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8 |
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12 |
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13 |
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14 | function safelyShadowsUndefined(variable) {
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15 | return variable.name === "undefined" &&
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16 | variable.references.every(ref => !ref.isWrite()) &&
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17 | variable.defs.every(def => def.node.type === "VariableDeclarator" && def.node.init === null);
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18 | }
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19 |
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20 |
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21 |
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22 |
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23 |
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24 | module.exports = {
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25 | meta: {
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26 | type: "suggestion",
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27 |
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28 | docs: {
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29 | description: "disallow identifiers from shadowing restricted names",
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30 | category: "Variables",
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31 | recommended: true,
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32 | url: "https://eslint.org/docs/rules/no-shadow-restricted-names"
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33 | },
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34 |
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35 | schema: [],
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36 |
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37 | messages: {
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38 | shadowingRestrictedName: "Shadowing of global property '{{name}}'."
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39 | }
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40 | },
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41 |
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42 | create(context) {
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43 |
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44 |
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45 | const RESTRICTED = new Set(["undefined", "NaN", "Infinity", "arguments", "eval"]);
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46 |
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47 | return {
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48 | "VariableDeclaration, :function, CatchClause"(node) {
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49 | for (const variable of context.getDeclaredVariables(node)) {
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50 | if (variable.defs.length > 0 && RESTRICTED.has(variable.name) && !safelyShadowsUndefined(variable)) {
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51 | context.report({
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52 | node: variable.defs[0].name,
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53 | messageId: "shadowingRestrictedName",
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54 | data: {
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55 | name: variable.name
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56 | }
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57 | });
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58 | }
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59 | }
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60 | }
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61 | };
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62 |
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63 | }
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64 | };
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