refactor: do not re-export system.ts from entry script

Author: johnsoncodehk

src/index.ts

@@ -1,5 +1,3 @@
-export * from './system.js';
-
 import { createReactiveSystem, type ReactiveNode, type ReactiveFlags } from './system.js';
 
 const enum EffectFlags {

tests/build.spec.ts

@@ -7,14 +7,14 @@ test('build: cjs', () => {
 	const index = require('../cjs/index.cjs');
 	const system = require('../cjs/system.cjs');
 
-	expect(typeof index.createReactiveSystem).toBe('function');
+	expect(typeof index.getCurrentSub).toBe('function');
 	expect(typeof system.createReactiveSystem).toBe('function');
 });
 
 test('build: esm', async () => {
 	const index = await import('../esm/index.mjs');
 	const system = await import('../esm/system.mjs');
 
-	expect(typeof index.createReactiveSystem).toBe('function');
+	expect(typeof index.getCurrentSub).toBe('function');
 	expect(typeof system.createReactiveSystem).toBe('function');
 });