Method revoke

packages/markmap-common/src/hook.ts:11–14

(fn: HookCallback<T>)

  }

  revoke(fn: HookCallback<T>): void {
    const i = this.listeners.indexOf(fn);
    if (i >= 0) this.listeners.splice(i, 1);
  }

  revokeAll(): void {
    this.listeners.splice(0);