node_modules/rxjs/dist/esm/internal/Observable.js

import { SafeSubscriber, Subscriber } from './Subscriber';
import { isSubscription } from './Subscription';
import { observable as Symbol_observable } from './symbol/observable';
import { pipeFromArray } from './util/pipe';
import { config } from './config';
import { isFunction } from './util/isFunction';
import { errorContext } from './util/errorContext';
export class Observable {
    constructor(subscribe) {
        if (subscribe) {
            this._subscribe = subscribe;
        }
    }
    lift(operator) {
        const observable = new Observable();
        observable.source = this;
        observable.operator = operator;
        return observable;
    }
    subscribe(observerOrNext, error, complete) {
        const subscriber = isSubscriber(observerOrNext) ? observerOrNext : new SafeSubscriber(observerOrNext, error, complete);
        errorContext(() => {
            const { operator, source } = this;
            subscriber.add(operator
                ?
                    operator.call(subscriber, source)
                : source
                    ?
                        this._subscribe(subscriber)
                    :
                        this._trySubscribe(subscriber));
        });
        return subscriber;
    }
    _trySubscribe(sink) {
        try {
            return this._subscribe(sink);
        }
        catch (err) {
            sink.error(err);
        }
    }
    forEach(next, promiseCtor) {
        promiseCtor = getPromiseCtor(promiseCtor);
        return new promiseCtor((resolve, reject) => {
            const subscriber = new SafeSubscriber({
                next: (value) => {
                    try {
                        next(value);
                    }
                    catch (err) {
                        reject(err);
                        subscriber.unsubscribe();
                    }
                },
                error: reject,
                complete: resolve,
            });
            this.subscribe(subscriber);
        });
    }
    _subscribe(subscriber) {
        var _a;
        return (_a = this.source) === null || _a === void 0 ? void 0 : _a.subscribe(subscriber);
    }
    [Symbol_observable]() {
        return this;
    }
    pipe(...operations) {
        return pipeFromArray(operations)(this);
    }
    toPromise(promiseCtor) {
        promiseCtor = getPromiseCtor(promiseCtor);
        return new promiseCtor((resolve, reject) => {
            let value;
            this.subscribe((x) => (value = x), (err) => reject(err), () => resolve(value));
        });
    }
}
Observable.create = (subscribe) => {
    return new Observable(subscribe);
};
function getPromiseCtor(promiseCtor) {
    var _a;
    return (_a = promiseCtor !== null && promiseCtor !== void 0 ? promiseCtor : config.Promise) !== null && _a !== void 0 ? _a : Promise;
}
function isObserver(value) {
    return value && isFunction(value.next) && isFunction(value.error) && isFunction(value.complete);
}
function isSubscriber(value) {
    return (value && value instanceof Subscriber) || (isObserver(value) && isSubscription(value));
}
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