Method constructor

lib/async_hooks.js:180–217

(type, opts = kEmptyObject)

class AsyncResource {
  constructor(type, opts = kEmptyObject) {
    validateString(type, 'type');

    let triggerAsyncId = opts;
    let requireManualDestroy = false;
    if (typeof opts !== 'number') {
      triggerAsyncId = opts.triggerAsyncId === undefined ?
        getDefaultTriggerAsyncId() : opts.triggerAsyncId;
      requireManualDestroy = !!opts.requireManualDestroy;
    }

    // Unlike emitInitScript, AsyncResource doesn't supports null as the
    // triggerAsyncId.
    if (!NumberIsSafeInteger(triggerAsyncId) || triggerAsyncId < -1) {
      throw new ERR_INVALID_ASYNC_ID('triggerAsyncId', triggerAsyncId);
    }

    this[contextFrameSymbol] = AsyncContextFrame.current();

    const asyncId = newAsyncId();
    this[async_id_symbol] = asyncId;
    this[trigger_async_id_symbol] = triggerAsyncId;

    if (initHooksExist()) {
      if (type.length === 0) {
        throw new ERR_ASYNC_TYPE(type);
      }

      emitInit(asyncId, type, triggerAsyncId, this);
    }

    if (!requireManualDestroy && destroyHooksExist()) {
      // This prop name (destroyed) has to be synchronized with C++
      const destroyed = { destroyed: false };
      this[destroyedSymbol] = destroyed;
      registerDestroyHook(this, asyncId, destroyed);
    }
  }

  runInAsyncScope(fn, thisArg, ...args) {
    const asyncId = this[async_id_symbol];