add isTSEnum() method. not used yet.

Author: endel

src/Metadata.ts

@@ -30,6 +30,13 @@ export function getNormalizedType(type: DefinitionType): DefinitionType  {
             : type;
 }
 
+// TODO: see test: "should support TypeScript enums"
+function isTSEnum(_enum: any) {
+    const keys = Object.keys(_enum);
+    const numericFields = keys.filter(k => /\d+/.test(k));
+    return (numericFields.length === (keys.length / 2) && _enum[_enum[numericFields[0]]] == numericFields[0]);
+}
+
 export const Metadata = {
 
     addField(metadata: any, index: number, name: string, type: DefinitionType, descriptor?: PropertyDescriptor) {

test/Schema.test.ts

@@ -366,16 +366,10 @@ describe("Type: Schema", () => {
             state.players.set("alice", new Player().assign({ items: new SetSchema<Item>([Item.SWORD, Item.SHIELD]) }));
             state.players.set("bob", new Player().assign({ items: new SetSchema<Item>([Item.BOW, Item.POTION]) }));
 
-            const decoded = new State();
-            decoded.decode(state.encodeAll());
-            decoded.decode(state.encode());
-
-            assert.strictEqual(2, decoded.players.size);
-            state.players.delete("bob")
-
-            decoded.decode(state.encode());
+            const decodedState = new State();
+            decodedState.decode(state.encode());
 
-            assert.strictEqual(1, decoded.players.size);
+            assert.strictEqual(2, decodedState.players.size);
             assertDeepStrictEqualEncodeAll(state);
         });
     });