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LibJS: Implement Temporal.PlainDate.prototype.with()
With one caveat: in the PreparePartialTemporalFields AO I made a change to fix a spec issue that would require the input object to always have a month or monthCode property. This is tracked in https://github.com/tc39/proposal-temporal/issues/1910 and may get accepted as-is, in which case we simply need to remove the NOTE comment.
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.PlainDate.prototype.with).toHaveLength(1);
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});
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test("basic functionality", () => {
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const plainDate = new Temporal.PlainDate(1970, 1, 1);
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const values = [
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[{ year: 2021 }, new Temporal.PlainDate(2021, 1, 1)],
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[{ year: 2021, month: 7 }, new Temporal.PlainDate(2021, 7, 1)],
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[{ year: 2021, month: 7, day: 6 }, new Temporal.PlainDate(2021, 7, 6)],
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[{ year: 2021, monthCode: "M07", day: 6 }, new Temporal.PlainDate(2021, 7, 6)],
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];
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for (const [arg, expected] of values) {
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expect(plainDate.with(arg).equals(expected)).toBeTrue();
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}
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// Supplying the same values doesn't change the date, but still creates a new object
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const plainDateLike = { year: plainDate.year, month: plainDate.month, day: plainDate.day };
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expect(plainDate.with(plainDateLike)).not.toBe(plainDate);
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expect(plainDate.with(plainDateLike).equals(plainDate)).toBeTrue();
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});
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});
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describe("errors", () => {
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test("this value must be a Temporal.PlainDate object", () => {
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expect(() => {
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Temporal.PlainDate.prototype.with.call("foo");
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}).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainDate");
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});
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test("argument must be an object", () => {
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expect(() => {
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new Temporal.PlainDate(1970, 1, 1).with("foo");
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}).toThrowWithMessage(TypeError, "foo is not an object");
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expect(() => {
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new Temporal.PlainDate(1970, 1, 1).with(42);
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}).toThrowWithMessage(TypeError, "42 is not an object");
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});
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test("argument must have one of 'day', 'month', 'monthCode', 'year'", () => {
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expect(() => {
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new Temporal.PlainDate(1970, 1, 1).with({});
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}).toThrowWithMessage(
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TypeError,
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"Object must have at least one of the following properties: day, month, monthCode, year"
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);
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});
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test("argument must not have 'calendar' or 'timeZone'", () => {
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expect(() => {
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new Temporal.PlainDate(1970, 1, 1).with({ calendar: {} });
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}).toThrowWithMessage(TypeError, "Object must not have a defined calendar property");
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expect(() => {
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new Temporal.PlainDate(1970, 1, 1).with({ timeZone: {} });
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}).toThrowWithMessage(TypeError, "Object must not have a defined timeZone property");
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});
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});
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