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/**
* @fileoverview Rule to flag assignment of the exception parameter
* @author Stephen Murray <spmurrayzzz>
*/
"use strict";
const astUtils = require("../util/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);
}
};
}
};