if (typeof Intl === "object") {
    const constructors = [
        Int8Array,
        Uint8Array,
        Uint8ClampedArray,
        Int16Array,
        Uint16Array,
        Int32Array,
        Uint32Array,
        Float32Array,
        Float64Array,
    ];

    const localeSep = [,,].toLocaleString();

    const originalNumberToLocaleString = Number.prototype.toLocaleString;

    // Missing arguments are passed as |undefined|.
    for (let constructor of constructors) {
        Number.prototype.toLocaleString = function() {
            assertEq(arguments.length, 2);
            assertEq(arguments[0], undefined);
            assertEq(arguments[1], undefined);
            return "pass";
        };

        // Single element case.
        assertEq(new constructor(1).toLocaleString(), "pass");

        // More than one element.
        assertEq(new constructor(2).toLocaleString(), "pass" + localeSep + "pass");
    }
    Number.prototype.toLocaleString = originalNumberToLocaleString;

    // Missing options is passed as |undefined|.
    for (let constructor of constructors) {
        Number.prototype.toLocaleString = function() {
            assertEq(arguments.length, 2);
            assertEq(arguments[0], locales);
            assertEq(arguments[1], undefined);
            return "pass";
        };
        let locales = {};

        // Single element case.
        assertEq(new constructor(1).toLocaleString(locales), "pass");

        // More than one element.
        assertEq(new constructor(2).toLocaleString(locales), "pass" + localeSep + "pass");
    }
    Number.prototype.toLocaleString = originalNumberToLocaleString;

    // Ensure "locales" and "options" arguments are passed to the array elements.
    for (let constructor of constructors) {
        Number.prototype.toLocaleString = function() {
            assertEq(arguments.length, 2);
            assertEq(arguments[0], locales);
            assertEq(arguments[1], options);
            return "pass";
        };
        let locales = {};
        let options = {};

        // Single element case.
        assertEq(new constructor(1).toLocaleString(locales, options), "pass");

        // More than one element.
        assertEq(new constructor(2).toLocaleString(locales, options), "pass" + localeSep + "pass");
    }
    Number.prototype.toLocaleString = originalNumberToLocaleString;

    assertEq(new Float32Array([NaN]).toLocaleString("ar"), "ليس رقم");
    assertEq(new Float64Array([NaN]).toLocaleString(["zh-hant", "ar"]), "非數值");
    assertEq(new Float32Array([Infinity]).toLocaleString(["dz"]), "གྲངས་མེད");
    assertEq(new Float64Array([-Infinity]).toLocaleString(["fr", "en"]), "-∞");

    const sampleValues = [-0, +0, -1, +1, -2, +2, -0.5, +0.5];
    const sampleLocales = [
        void 0,
        "en",
        "th-th-u-nu-thai",
        ["tlh", "de"],
    ];
    const sampleOptions = [
        void 0,
        {},
        {style: "percent"},
        {style: "currency", currency: "USD", minimumIntegerDigits: 4},
    ];
    for (let locale of sampleLocales) {
        for (let options of sampleOptions) {
            let nf = new Intl.NumberFormat(locale, options);
            for (let constructor of constructors) {
                let typedArray = new constructor(sampleValues);
                let expected = [].map.call(typedArray, nf.format).join(localeSep);
                assertEq(typedArray.toLocaleString(locale, options), expected);
            }
        }
    }
}

if (typeof reportCompare === "function")
    reportCompare(true, true);