58 lines
1.3 KiB
JavaScript
58 lines
1.3 KiB
JavaScript
/**
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* @fileoverview Rule to flag assignment of the exception parameter
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* @author Stephen Murray <spmurrayzzz>
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*/
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"use strict";
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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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/** @type {import('../types').Rule.RuleModule} */
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "Disallow reassigning exceptions in `catch` clauses",
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recommended: true,
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url: "https://eslint.org/docs/latest/rules/no-ex-assign",
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},
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schema: [],
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messages: {
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unexpected: "Do not assign to the exception parameter.",
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},
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},
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create(context) {
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const sourceCode = context.sourceCode;
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/**
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* Finds and reports references that are non initializer and writable.
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* @param {Variable} variable A variable to check.
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* @returns {void}
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*/
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function checkVariable(variable) {
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astUtils
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.getModifyingReferences(variable.references)
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.forEach(reference => {
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context.report({
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node: reference.identifier,
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messageId: "unexpected",
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});
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});
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}
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return {
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CatchClause(node) {
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sourceCode.getDeclaredVariables(node).forEach(checkVariable);
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},
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};
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},
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};
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