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LibJS: Add fast path TimeZone conversion to PlainDate#toZonedDateTime
This is a normative chane in the Temporal spec.
See: fcab1af
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707f12f927
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2 changed files with 42 additions and 12 deletions
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@ -74,6 +74,26 @@ describe("correct behavior", () => {
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expect(zonedDateTime.calendar).toBe(plainDate.calendar);
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expect(zonedDateTime.timeZone.id).toBe("UTC");
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});
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test("time zone fast path returns if it is passed a Temporal.TimeZone instance", () => {
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const plainDate = new Temporal.PlainDate(2021, 7, 6);
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// This is obseravble via there being no property lookups (avoiding a "timeZone" property lookup in this case)
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let madeObservableHasPropertyLookup = false;
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class TimeZone extends Temporal.TimeZone {
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constructor() {
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super("UTC");
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}
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get timeZone() {
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madeObservableHasPropertyLookup = true;
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return this;
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}
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}
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const timeZone = new TimeZone();
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plainDate.toZonedDateTime(timeZone);
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expect(madeObservableHasPropertyLookup).toBeFalse();
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});
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});
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describe("errors", () => {
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