parse-rest-destructuring-parameter.js

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// |reftest| skip-if(!xulRuntime.shell)

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

function funArgs(params) {

    return Reflect.parse(`function f(${params}) {}`).body[0].rest;

var arrayRest = funArgs("...[]");

assertEq(arrayRest.type, "ArrayPattern");

assertEq(arrayRest.elements.length, 0);

arrayRest = funArgs("...[a]");

assertEq(arrayRest.type, "ArrayPattern");

assertEq(arrayRest.elements.length, 1);

var objectRest = funArgs("...{}");

assertEq(objectRest.type, "ObjectPattern");

assertEq(objectRest.properties.length, 0);

objectRest = funArgs("...{p: a}");

assertEq(objectRest.type, "ObjectPattern");

assertEq(objectRest.properties.length, 1);

if (typeof reportCompare === "function")

    reportCompare(0, 0);