build/lib/tsb/transpiler.ts/Transpiler/join
class Transpiler:	async join() {
		// wait for all penindg jobs
		this._consumeQueue();
		await Promise.allSettled(this._allJobs);
		this._allJobs.length = 0;

		// terminate all worker
		this._workerPool.forEach(w => w.terminate());
		this._workerPool.length = 0;
	}