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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
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "problem",
docs: {
description: "Disallow reassigning exceptions in `catch` clauses",
recommended: true,
url: "https://eslint.org/docs/latest/rules/no-ex-assign",
},
schema: [],
messages: {
unexpected: "Do not assign to the exception parameter.",
},
},
create(context) {
const sourceCode = context.sourceCode;
/**
* 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) {
sourceCode.getDeclaredVariables(node).forEach(checkVariable);
},
};
},
};