feat(@formatjs/intl-locale): update impl to match stage-3

also fix #4375

BREAKING CHANGE: a lot of getters have been removed from the spec so
we've also removed them from this polyfill

packages/ecma402-abstract/index.ts

@@ -31,23 +31,24 @@ export {default as _formatToParts} from './NumberFormat/format_to_parts'
 export * from './PartitionPattern'
 export * from './SupportedLocales'
 export {
+ createDataProperty,
+ defineProperty,
  getInternalSlot,
+ getMagnitude,
  getMultiInternalSlots,
  isLiteralPart,
  setInternalSlot,
  setMultiInternalSlots,
- getMagnitude,
- defineProperty,
 } from './utils'
 export type {LiteralPart} from './utils'
 
+export * from './262'
 export {isMissingLocaleDataError} from './data'
-export * from './types/relative-time'
+export type {LocaleData} from './types/core'
 export * from './types/date-time'
+export * from './types/displaynames'
 export * from './types/list'
-export * from './types/plural-rules'
 export * from './types/number'
-export * from './types/displaynames'
+export * from './types/plural-rules'
+export * from './types/relative-time'
 export {invariant} from './utils'
-export type {LocaleData} from './types/core'
-export * from './262'

packages/ecma402-abstract/utils.ts

@@ -118,6 +118,25 @@ export function defineProperty<T extends object>(
  })
 }
 
+/**
+ * 7.3.5 CreateDataProperty
+ * @param target
+ * @param name
+ * @param value
+ */
+export function createDataProperty<T extends object>(
+ target: T,
+ name: string | symbol,
+ value: any
+) {
+ Object.defineProperty(target, name, {
+ configurable: true,
+ enumerable: true,
+ writable: true,
+ value,
+ })
+}
+
 export const UNICODE_EXTENSION_SEQUENCE_REGEX = /-u(?:-[0-9a-z]{2,8})+/gi
 
 export function invariant(

packages/intl-locale/get_internal_slots.ts

@@ -5,10 +5,23 @@ import Locale, {IntlLocaleInternal} from '.'
 
 const internalSlotMap = new WeakMap<Locale, IntlLocaleInternal>()
 
-export default function getInternalSlots(x: Locale): IntlLocaleInternal {
+export default function getInternalSlots(
+ x: Locale,
+ internalSlotsList: string[] = []
+): IntlLocaleInternal {
  let internalSlots = internalSlotMap.get(x)
  if (!internalSlots) {
- internalSlots = Object.create(null) as IntlLocaleInternal
+ internalSlots = Object.create(
+ null,
+ internalSlotsList.reduce<PropertyDescriptorMap>((all, prop) => {
+ all[prop] = {
+ enumerable: false,
+ writable: true,
+ configurable: true,
+ }
+ return all
+ }, {})
+ ) as IntlLocaleInternal
  internalSlotMap.set(x, internalSlots)
  }
  return internalSlots