Method run

packages/reactivity/src/effect.ts:162–192

()

  }

  run(): T {
    // TODO cleanupEffect

    if (!(this.flags & EffectFlags.ACTIVE)) {
      // stopped during cleanup
      return this.fn()
    }

    this.flags |= EffectFlags.RUNNING
    cleanupEffect(this)
    prepareDeps(this)
    const prevEffect = activeSub
    const prevShouldTrack = shouldTrack
    activeSub = this
    shouldTrack = true

    try {
      return this.fn()
    } finally {
      if (__DEV__ && activeSub !== this) {
        warn(
          'Active effect was not restored correctly - ' +
            'this is likely a Vue internal bug.',
        )
      }
      cleanupDeps(this)
      activeSub = prevEffect
      shouldTrack = prevShouldTrack
      this.flags &= ~EffectFlags.RUNNING
    }
  }

  stop(): void {
    if (this.flags & EffectFlags.ACTIVE) {