/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { __awaiter } from "tslib";
import { BehaviorSubject } from 'rxjs';
/** Subject used to dispatch and listen for changes to the auto change detection status . */
const autoChangeDetectionSubject = new BehaviorSubject({
    isDisabled: false
});
/** The current subscription to `autoChangeDetectionSubject`. */
let autoChangeDetectionSubscription;
/**
 * The default handler for auto change detection status changes. This handler will be used if the
 * specific environment does not install its own.
 * @param status The new auto change detection status.
 */
function defaultAutoChangeDetectionHandler(status) {
    var _a;
    (_a = status.onDetectChangesNow) === null || _a === void 0 ? void 0 : _a.call(status);
}
/**
 * Allows a test `HarnessEnvironment` to install its own handler for auto change detection status
 * changes.
 * @param handler The handler for the auto change detection status.
 */
export function handleAutoChangeDetectionStatus(handler) {
    stopHandlingAutoChangeDetectionStatus();
    autoChangeDetectionSubscription = autoChangeDetectionSubject.subscribe(handler);
}
/** Allows a `HarnessEnvironment` to stop handling auto change detection status changes. */
export function stopHandlingAutoChangeDetectionStatus() {
    autoChangeDetectionSubscription === null || autoChangeDetectionSubscription === void 0 ? void 0 : autoChangeDetectionSubscription.unsubscribe();
    autoChangeDetectionSubscription = null;
}
/**
 * Batches together triggering of change detection over the duration of the given function.
 * @param fn The function to call with batched change detection.
 * @param triggerBeforeAndAfter Optionally trigger change detection once before and after the batch
 *   operation. If false, change detection will not be triggered.
 * @return The result of the given function.
 */
function batchChangeDetection(fn, triggerBeforeAndAfter) {
    return __awaiter(this, void 0, void 0, function* () {
        // If change detection batching is already in progress, just run the function.
        if (autoChangeDetectionSubject.getValue().isDisabled) {
            return yield fn();
        }
        // If nothing is handling change detection batching, install the default handler.
        if (!autoChangeDetectionSubscription) {
            handleAutoChangeDetectionStatus(defaultAutoChangeDetectionHandler);
        }
        if (triggerBeforeAndAfter) {
            yield new Promise(resolve => autoChangeDetectionSubject.next({
                isDisabled: true,
                onDetectChangesNow: resolve,
            }));
            // The function passed in may throw (e.g. if the user wants to make an expectation of an error
            // being thrown. If this happens, we need to make sure we still re-enable change detection, so
            // we wrap it in a `finally` block.
            try {
                return yield fn();
            }
            finally {
                yield new Promise(resolve => autoChangeDetectionSubject.next({
                    isDisabled: false,
                    onDetectChangesNow: resolve,
                }));
            }
        }
        else {
            autoChangeDetectionSubject.next({ isDisabled: true });
            // The function passed in may throw (e.g. if the user wants to make an expectation of an error
            // being thrown. If this happens, we need to make sure we still re-enable change detection, so
            // we wrap it in a `finally` block.
            try {
                return yield fn();
            }
            finally {
                autoChangeDetectionSubject.next({ isDisabled: false });
            }
        }
    });
}
/**
 * Disables the harness system's auto change detection for the duration of the given function.
 * @param fn The function to disable auto change detection for.
 * @return The result of the given function.
 */
export function manualChangeDetection(fn) {
    return __awaiter(this, void 0, void 0, function* () {
        return batchChangeDetection(fn, false);
    });
}
/**
 * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change
 * detection over the entire operation such that change detection occurs exactly once before
 * resolving the values and once after.
 * @param values A getter for the async values to resolve in parallel with batched change detection.
 * @return The resolved values.
 */
export function parallel(values) {
    return __awaiter(this, void 0, void 0, function* () {
        return batchChangeDetection(() => Promise.all(values()), true);
    });
}
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The callback should then be called as soon as change\n   * detection is done.\n   */\n  onDetectChangesNow?: () => void;\n}\n\n/** Subject used to dispatch and listen for changes to the auto change detection status . */\nconst autoChangeDetectionSubject = new BehaviorSubject<AutoChangeDetectionStatus>({\n  isDisabled: false\n});\n\n/** The current subscription to `autoChangeDetectionSubject`. */\nlet autoChangeDetectionSubscription: Subscription | null;\n\n/**\n * The default handler for auto change detection status changes. This handler will be used if the\n * specific environment does not install its own.\n * @param status The new auto change detection status.\n */\nfunction defaultAutoChangeDetectionHandler(status: AutoChangeDetectionStatus) {\n  status.onDetectChangesNow?.();\n}\n\n/**\n * Allows a test `HarnessEnvironment` to install its own handler for auto change detection status\n * changes.\n * @param handler The handler for the auto change detection status.\n */\nexport function handleAutoChangeDetectionStatus(\n    handler: (status: AutoChangeDetectionStatus) => void) {\n  stopHandlingAutoChangeDetectionStatus();\n  autoChangeDetectionSubscription = autoChangeDetectionSubject.subscribe(handler);\n}\n\n/** Allows a `HarnessEnvironment` to stop handling auto change detection status changes. */\nexport function stopHandlingAutoChangeDetectionStatus() {\n  autoChangeDetectionSubscription?.unsubscribe();\n  autoChangeDetectionSubscription = null;\n}\n\n/**\n * Batches together triggering of change detection over the duration of the given function.\n * @param fn The function to call with batched change detection.\n * @param triggerBeforeAndAfter Optionally trigger change detection once before and after the batch\n *   operation. If false, change detection will not be triggered.\n * @return The result of the given function.\n */\nasync function batchChangeDetection<T>(fn: () => Promise<T>, triggerBeforeAndAfter: boolean) {\n  // If change detection batching is already in progress, just run the function.\n  if (autoChangeDetectionSubject.getValue().isDisabled) {\n    return await fn();\n  }\n\n  // If nothing is handling change detection batching, install the default handler.\n  if (!autoChangeDetectionSubscription) {\n    handleAutoChangeDetectionStatus(defaultAutoChangeDetectionHandler);\n  }\n\n  if (triggerBeforeAndAfter) {\n    await new Promise(resolve => autoChangeDetectionSubject.next({\n      isDisabled: true,\n      onDetectChangesNow: resolve as () => void,\n    }));\n    // The function passed in may throw (e.g. if the user wants to make an expectation of an error\n    // being thrown. If this happens, we need to make sure we still re-enable change detection, so\n    // we wrap it in a `finally` block.\n    try {\n      return await fn();\n    } finally {\n      await new Promise(resolve => autoChangeDetectionSubject.next({\n        isDisabled: false,\n        onDetectChangesNow: resolve as () => void,\n      }));\n    }\n  } else {\n    autoChangeDetectionSubject.next({isDisabled: true});\n    // The function passed in may throw (e.g. if the user wants to make an expectation of an error\n    // being thrown. If this happens, we need to make sure we still re-enable change detection, so\n    // we wrap it in a `finally` block.\n    try {\n      return await fn();\n    } finally {\n      autoChangeDetectionSubject.next({isDisabled: false});\n    }\n  }\n}\n\n/**\n * Disables the harness system's auto change detection for the duration of the given function.\n * @param fn The function to disable auto change detection for.\n * @return The result of the given function.\n */\nexport async function manualChangeDetection<T>(fn: () => Promise<T>) {\n  return batchChangeDetection(fn, false);\n}\n\n\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport function parallel<T1, T2, T3, T4, T5>(\n  values: () =>\n      [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>,\n       T5 | PromiseLike<T5>\n      ]): Promise<[T1, T2, T3, T4, T5]>;\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport function parallel<T1, T2, T3, T4>(\n  values: () =>\n      [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>]):\n  Promise<[T1, T2, T3, T4]>;\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport function parallel<T1, T2, T3>(\n  values: () => [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>]):\n  Promise<[T1, T2, T3]>;\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport function parallel<T1, T2>(values: () => [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>]):\n  Promise<[T1, T2]>;\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport function parallel<T>(values: () => (T | PromiseLike<T>)[]): Promise<T[]>;\n\n/**\n * Resolves the given list of async values in parallel (i.e. via Promise.all) while batching change\n * detection over the entire operation such that change detection occurs exactly once before\n * resolving the values and once after.\n * @param values A getter for the async values to resolve in parallel with batched change detection.\n * @return The resolved values.\n */\nexport async function parallel<T>(values: () => Iterable<T | PromiseLike<T>>): Promise<T[]> {\n  return batchChangeDetection(() => Promise.all(values()), true);\n}\n"]}