Switch from WeakMap to Map

Author: Demivan

fluent-bundle/src/bundle.ts

@@ -4,7 +4,7 @@ import { FluentResource } from "./resource.js";
 import { FluentValue, FluentNone, FluentFunction } from "./types.js";
 import { Message, Term, Pattern } from "./ast.js";
 import { NUMBER, DATETIME } from "./builtins.js";
-import { getMemoizerForLocale } from "./memoizer.js";
+import { getMemoizerForLocale, IntlCache } from "./memoizer.js";
 
 export type TextTransform = (text: string) => string;
 
@@ -23,7 +23,7 @@ export class FluentBundle {
   public _functions: Record<string, FluentFunction>;
   public _useIsolating: boolean;
   public _transform: TextTransform;
-  public _intls: WeakMap<object, Record<string, object>>;
+  public _intls: IntlCache;
 
   /**
    * Create an instance of `FluentBundle`.

fluent-bundle/src/memoizer.ts

@@ -1,12 +1,12 @@
-type IntlCache = WeakMap<object, Record<string, object>>;
+export type IntlCache = Map<object, Record<string, object>>;
 
 const cache = new Map<string, IntlCache>();
 
 export function getMemoizerForLocale(locales: string | string[]): IntlCache {
   const stringLocale = Array.isArray(locales) ? locales.join(" ") : locales;
   let memoizer = cache.get(stringLocale);
   if (memoizer === undefined) {
-    memoizer = new WeakMap();
+    memoizer = new Map();
     cache.set(stringLocale, memoizer);
   }