70 lines
1.9 KiB
JavaScript
70 lines
1.9 KiB
JavaScript
/**
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* @fileoverview Disallow shadowing of NaN, undefined, and Infinity (ES5 section 15.1.1)
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* @author Michael Ficarra
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: "disallow identifiers from shadowing restricted names",
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category: "Variables",
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recommended: false
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},
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schema: []
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},
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create(context) {
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const RESTRICTED = ["undefined", "NaN", "Infinity", "arguments", "eval"];
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/**
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* Check if the node name is present inside the restricted list
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* @param {ASTNode} id id to evaluate
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* @returns {void}
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* @private
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*/
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function checkForViolation(id) {
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if (RESTRICTED.indexOf(id.name) > -1) {
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context.report({
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node: id,
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message: "Shadowing of global property '{{idName}}'.",
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data: {
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idName: id.name
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}
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});
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}
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}
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return {
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VariableDeclarator(node) {
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checkForViolation(node.id);
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},
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ArrowFunctionExpression(node) {
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[].map.call(node.params, checkForViolation);
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},
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FunctionExpression(node) {
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if (node.id) {
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checkForViolation(node.id);
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}
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[].map.call(node.params, checkForViolation);
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},
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FunctionDeclaration(node) {
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if (node.id) {
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checkForViolation(node.id);
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[].map.call(node.params, checkForViolation);
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}
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},
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CatchClause(node) {
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checkForViolation(node.param);
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}
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};
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}
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};
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