Move IsBuiltinCalendar to ecmascript.ts.

UPSTREAM_COMMIT=bfaabda0bd64ef02413e84ad5f926002e47a1f50

Author: Ms2ger

lib/calendar.ts

@@ -127,7 +127,7 @@ export class Calendar implements Temporal.Calendar {
     }
 
     const id = ES.ToString(idParam);
-    if (!IsBuiltinCalendar(id)) throw new RangeError(`invalid calendar identifier ${id}`);
+    if (!ES.IsBuiltinCalendar(id)) throw new RangeError(`invalid calendar identifier ${id}`);
     CreateSlots(this);
     SetSlot(this, CALENDAR_ID, id);
 
@@ -2540,9 +2540,3 @@ for (const Helper of [
   // calendars. The `helper` property contains per-calendar logic.
   impl[helper.id] = { ...nonIsoImpl, helper };
 }
-
-const BUILTIN_CALENDAR_IDS = Object.keys(impl) as BuiltinCalendarId[];
-
-export function IsBuiltinCalendar(id: string): id is BuiltinCalendarId {
-  return ArrayIncludes.call(BUILTIN_CALENDAR_IDS, id);
-}

lib/ecmascript.ts

@@ -1,3 +1,4 @@
+const ArrayIncludes = Array.prototype.includes;
 const ArrayPrototypePush = Array.prototype.push;
 const IntlDateTimeFormat = globalThis.Intl.DateTimeFormat;
 const MathMin = Math.min;
@@ -36,7 +37,8 @@ import type {
   DurationParams,
   PlainDateTimeParams,
   PlainYearMonthParams,
-  FieldRecord
+  FieldRecord,
+  BuiltinCalendarId
 } from './internaltypes';
 import { GetIntrinsic } from './intrinsicclass';
 import {
@@ -73,7 +75,6 @@ import {
   MICROSECONDS,
   NANOSECONDS
 } from './slots';
-import { IsBuiltinCalendar } from './calendar';
 
 export const ZERO = JSBI.BigInt(0);
 const ONE = JSBI.BigInt(1);
@@ -93,6 +94,28 @@ const ABOUT_TEN_YEARS_NANOS = JSBI.multiply(DAY_NANOS, JSBI.BigInt(366 * 10));
 const ABOUT_ONE_YEAR_NANOS = JSBI.multiply(DAY_NANOS, JSBI.BigInt(366 * 1));
 const TWO_WEEKS_NANOS = JSBI.multiply(DAY_NANOS, JSBI.BigInt(2 * 7));
 
+const BUILTIN_CALENDAR_IDS = [
+  'iso8601',
+  'hebrew',
+  'islamic',
+  'islamic-umalqura',
+  'islamic-tbla',
+  'islamic-civil',
+  'islamic-rgsa',
+  'islamicc',
+  'persian',
+  'ethiopic',
+  'ethioaa',
+  'coptic',
+  'chinese',
+  'dangi',
+  'roc',
+  'indian',
+  'buddhist',
+  'japanese',
+  'gregory'
+];
+
 function IsInteger(value: unknown): value is number {
   if (typeof value !== 'number' || !NumberIsFinite(value)) return false;
   const abs = MathAbs(value);
@@ -5293,6 +5316,10 @@ function GetNumberOption<P extends string, T extends Partial<Record<P, unknown>>
   return MathFloor(value);
 }
 
+export function IsBuiltinCalendar(id: string): id is BuiltinCalendarId {
+  return ArrayIncludes.call(BUILTIN_CALENDAR_IDS, id);
+}
+
 const OFFSET = new RegExp(`^${PARSE.offset.source}$`);
 
 function bisect(