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