import { Injector, Signal } from '@angular/core';
import { QueryFilters } from '@tanstack/query-core';
export interface InjectIsFetchingOptions {
    /**
     * The `Injector` in which to create the isFetching signal.
     *
     * If this is not provided, the current injection context will be used instead (via `inject`).
     */
    injector?: Injector;
}
/**
 * Injects a signal that tracks the number of queries that your application is loading or fetching in the
 * background (useful for app-wide loading indicators).
 *
 * @param filters - The {@link QueryFilters} to narrow down the matched queries.
 * @param options - Additional configuration
 * @returns A `Signal` with the number of queries that your application is currently loading or fetching in
 * the background.
 *
 * @example
 * ```angular-ts
 * @Component({
 *   selector: 'posts-fetching-indicator',
 *   template: `
 *     @if (isFetchingPosts()) {
 *       <span>Refreshing posts...</span>
 *     }
 *   `,
 * })
 * export class PostsFetchingIndicator {
 *   // How many queries matching the posts prefix are fetching?
 *   readonly isFetchingPosts = injectIsFetching({ queryKey: ['posts'] })
 * }
 * ```
 *
 * @example
 * A global loading indicator for any query fetching in the background, not just the ones on screen:
 * ```angular-ts
 * @Component({
 *   selector: 'global-loading-indicator',
 *   template: `
 *     @if (isFetching()) {
 *       <div>Queries are fetching in the background...</div>
 *     }
 *   `,
 * })
 * export class GlobalLoadingIndicator {
 *   readonly isFetching = injectIsFetching()
 * }
 * ```
 */
export declare function injectIsFetching(filters?: QueryFilters, options?: InjectIsFetchingOptions): Signal<number>;