import { ObservableInput } from '../types';
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import { subscribeToArray } from './subscribeToArray';
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import { subscribeToPromise } from './subscribeToPromise';
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import { subscribeToIterable } from './subscribeToIterable';
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import { subscribeToObservable } from './subscribeToObservable';
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import { isArrayLike } from './isArrayLike';
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import { isPromise } from './isPromise';
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import { isObject } from './isObject';
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import { iterator as Symbol_iterator } from '../symbol/iterator';
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import { observable as Symbol_observable } from '../symbol/observable';
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import { Subscription } from '../Subscription';
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import { Subscriber } from '../Subscriber';
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export const subscribeTo = <T>(result: ObservableInput<T>): (subscriber: Subscriber<T>) => Subscription | void => {
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if (!!result && typeof result[Symbol_observable] === 'function') {
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return subscribeToObservable(result as any);
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} else if (isArrayLike(result)) {
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return subscribeToArray(result);
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} else if (isPromise(result)) {
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return subscribeToPromise(result as Promise<any>);
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} else if (!!result && typeof result[Symbol_iterator] === 'function') {
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return subscribeToIterable(result as any);
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} else {
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const value = isObject(result) ? 'an invalid object' : `'${result}'`;
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const msg = `You provided ${value} where a stream was expected.`
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+ ' You can provide an Observable, Promise, Array, or Iterable.';
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throw new TypeError(msg);
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}
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};
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