Add property symbols

.changeset/fresh-chefs-study.md

@@ -0,0 +1,5 @@
+---
+"@xobj/core": minor
+---
+
+Add property symbols

packages/core/src/encoders/object.ts

@@ -5,7 +5,8 @@ import { EncodeContext } from '../encode';
 export function encodeObject(value: any, context: EncodeContext): void {
 	const { writer, links } = context;
 	links.push(value);
-	const keys = Object.keys(value);
+
+	const keys = Object.getOwnPropertyNames(value);
 	for (const key of keys) {
 		const number = parseFloat(key);
 		if (Number.isInteger(number)) {
@@ -15,5 +16,12 @@ export function encodeObject(value: any, context: EncodeContext): void {
 		}
 		encodeValue(value[key], context);
 	}
+
+	const symbols = Object.getOwnPropertySymbols(value);
+	for (const symbol of symbols) {
+		encodeValue(symbol, context);
+		encodeValue(value[symbol], context);
+	}
+
 	writer.writeUintVar(ValueType.END);
 }

packages/core/test/object.test.ts

@@ -46,4 +46,26 @@ describe('object', () => {
 		const jsonData = new TextEncoder().encode(JSON.stringify(source));
 		expect(jsonData.byteLength).toBeGreaterThan(buffer.byteLength);
 	});
+
+	it('should write object with symbols', () => {
+		const s1 = Symbol('one');
+		const s2 = Symbol('two');
+
+		const source = {
+			one: 11,
+			11: 'one',
+			symbols: [s1, s2],
+			[s1]: 'symbol one',
+			[s2]: 'symbol two',
+		};
+
+		const buffer = encode(source);
+
+		const target = decode(buffer);
+
+		expect(target.one).toBe(source.one);
+		expect(target[11]).toBe(source[11]);
+		expect(target[target.symbols[0]]).toBe('symbol one');
+		expect(target[target.symbols[1]]).toBe('symbol two');
+	});
 });