Method removeObserver

packages/query-core/src/mutation.ts:143–153

(observer: MutationObserver<any, any, any, any>)

  }

  removeObserver(observer: MutationObserver<any, any, any, any>): void {
    this.#observers = this.#observers.filter((x) => x !== observer)

    this.scheduleGc()

    this.#mutationCache.notify({
      type: 'observerRemoved',
      mutation: this,
      observer,
    })
  }

  protected optionalRemove() {
    if (!this.#observers.length) {