Method removeObserver

packages/query-core/src/query.ts:523–548

@internal

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

  /** @internal */
  removeObserver(observer: QueryObserver<any, any, any, any, any>): void {
    const index = this.observers.indexOf(observer)
    if (index !== -1) {
      this.observers.splice(index, 1)

      if (!this.observers.length) {
        // If the transport layer does not support cancellation
        // we'll let the query continue so the result can be cached
        if (this.#retryer) {
          if (
            this.#abortSignalConsumed ||
            (this.state.fetchStatus === 'paused' &&
              this.state.status === 'pending')
          ) {
            this.#retryer.cancel({ revert: true })
          } else {
            this.#retryer.cancelRetry()
          }
        }

        this.scheduleGc()
      }

      this.#cache.notify({ type: 'observerRemoved', query: this, observer })
    }
  }

  /**
   * Returns the number of observers currently subscribed to this query.