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