node/tools/eslint/lib/rules/no-ex-assign.js

/**
 * @fileoverview Rule to flag assignment of the exception parameter
 * @author Stephen Murray <spmurrayzzz>
 */

"use strict";

var astUtils = require("../ast-utils");

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(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(function(reference) {
            context.report(
                reference.identifier,
                "Do not assign to the exception parameter.");
        });
    }

    return {
        "CatchClause": function(node) {
            context.getDeclaredVariables(node).forEach(checkVariable);
        }
    };

};

module.exports.schema = [];