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codeql-action/node_modules/eslint/lib/rules/no-catch-shadow.js
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/** | |
* @fileoverview Rule to flag variable leak in CatchClauses in IE 8 and earlier | |
* @author Ian Christian Myers | |
* @deprecated in ESLint v5.1.0 | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const astUtils = require("./utils/ast-utils"); | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow `catch` clause parameters from shadowing variables in the outer scope", | |
recommended: false, | |
url: "https://eslint.org/docs/latest/rules/no-catch-shadow" | |
}, | |
replacedBy: ["no-shadow"], | |
deprecated: true, | |
schema: [], | |
messages: { | |
mutable: "Value of '{{name}}' may be overwritten in IE 8 and earlier." | |
} | |
}, | |
create(context) { | |
const sourceCode = context.sourceCode; | |
//-------------------------------------------------------------------------- | |
// Helpers | |
//-------------------------------------------------------------------------- | |
/** | |
* Check if the parameters are been shadowed | |
* @param {Object} scope current scope | |
* @param {string} name parameter name | |
* @returns {boolean} True is its been shadowed | |
*/ | |
function paramIsShadowing(scope, name) { | |
return astUtils.getVariableByName(scope, name) !== null; | |
} | |
//-------------------------------------------------------------------------- | |
// Public API | |
//-------------------------------------------------------------------------- | |
return { | |
"CatchClause[param!=null]"(node) { | |
let scope = sourceCode.getScope(node); | |
/* | |
* When ecmaVersion >= 6, CatchClause creates its own scope | |
* so start from one upper scope to exclude the current node | |
*/ | |
if (scope.block === node) { | |
scope = scope.upper; | |
} | |
if (paramIsShadowing(scope, node.param.name)) { | |
context.report({ node, messageId: "mutable", data: { name: node.param.name } }); | |
} | |
} | |
}; | |
} | |
}; |