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LibJS: Fast-path ToTemporalCalendar when the argument is a Calendar

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This is a normative change in the Temporal spec.

See: 2a43b39
This commit is contained in:
Luke Wilde 2022-10-16 00:01:19 +01:00 • committed by Linus Groh
parent 4b27c6e688
commit 8c3512d6ce
2 changed files with 29 additions and 4 deletions
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18
Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.from.js
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@ -24,4 +24,22 @@ describe("normal behavior", () => {
expect(Temporal.Calendar.from("iso8601").id).toBe("iso8601");
expect(Temporal.Calendar.from("2021-07-06[u-ca=iso8601]").id).toBe("iso8601");
});
test("ToTemporalCalendar fast path returns if it is passed a Temporal.Calendar instance", () => {
// This is obseravble via there being no property lookups (avoiding a "calendar" property lookup in this case)
let madeObservableHasPropertyLookup = false;
class Calendar extends Temporal.Calendar {
constructor() {
super("iso8601");
}
get calendar() {
madeObservableHasPropertyLookup = true;
return this;
}
}
const calendar = new Calendar();
Temporal.Calendar.from(calendar);
expect(madeObservableHasPropertyLookup).toBeFalse();
});
});