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LibJS: Implement ECMA-402 Date.prototype.toLocaleString
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2 changed files with 93 additions and 6 deletions
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describe("errors", () => {
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test("called on non-Date object", () => {
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expect(() => {
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Date.prototype.toLocaleString();
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}).toThrowWithMessage(TypeError, "Not an object of type Date");
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});
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test("called with value that cannot be converted to a number", () => {
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expect(() => {
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new Date(Symbol.hasInstance).toLocaleString();
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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expect(() => {
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new Date(1n).toLocaleString();
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}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
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});
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test("time value cannot be clipped", () => {
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expect(() => {
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new Date(-8.65e15).toLocaleString();
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}).toThrowWithMessage(RangeError, "Time value must be between -8.64E15 and 8.64E15");
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});
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});
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describe("correct behavior", () => {
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test("NaN", () => {
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const d = new Date(NaN);
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expect(d.toLocaleString()).toBe("Invalid Date");
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});
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const d0 = new Date(Date.UTC(2021, 11, 7, 17, 40, 50, 456));
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const d1 = new Date(Date.UTC(1989, 0, 23, 7, 8, 9, 45));
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test("defaults to date and time", () => {
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expect(d0.toLocaleString("en", { timeZone: "UTC" })).toBe("12/7/2021, 5:40:50 PM");
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expect(d1.toLocaleString("en", { timeZone: "UTC" })).toBe("1/23/1989, 7:08:09 AM");
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expect(d0.toLocaleString("ar", { timeZone: "UTC" })).toBe("٧/١٢/٢٠٢١, ٥:٤٠:٥٠ م");
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expect(d1.toLocaleString("ar", { timeZone: "UTC" })).toBe("٢٣/١/١٩٨٩, ٧:٠٨:٠٩ ص");
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});
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test("dateStyle may be set", () => {
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expect(d0.toLocaleString("en", { dateStyle: "short", timeZone: "UTC" })).toBe("12/7/21");
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expect(d1.toLocaleString("en", { dateStyle: "short", timeZone: "UTC" })).toBe("1/23/89");
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expect(d0.toLocaleString("ar", { dateStyle: "short", timeZone: "UTC" })).toBe(
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"٧/١٢/٢٠٢١"
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);
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expect(d1.toLocaleString("ar", { dateStyle: "short", timeZone: "UTC" })).toBe(
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"٢٣/١/١٩٨٩"
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);
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});
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test("timeStyle may be set", () => {
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expect(d0.toLocaleString("en", { timeStyle: "short", timeZone: "UTC" })).toBe("5:40 PM");
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expect(d1.toLocaleString("en", { timeStyle: "short", timeZone: "UTC" })).toBe("7:08 AM");
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expect(d0.toLocaleString("ar", { timeStyle: "short", timeZone: "UTC" })).toBe("٥:٤٠ م");
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expect(d1.toLocaleString("ar", { timeStyle: "short", timeZone: "UTC" })).toBe("٧:٠٨ ص");
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});
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});
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