| 1 | import { ObservableInput } from '../types';
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| 2 | import { subscribeToArray } from './subscribeToArray';
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| 3 | import { subscribeToPromise } from './subscribeToPromise';
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| 4 | import { subscribeToIterable } from './subscribeToIterable';
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| 5 | import { subscribeToObservable } from './subscribeToObservable';
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| 6 | import { isArrayLike } from './isArrayLike';
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| 7 | import { isPromise } from './isPromise';
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| 8 | import { isObject } from './isObject';
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| 9 | import { iterator as Symbol_iterator } from '../symbol/iterator';
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| 10 | import { observable as Symbol_observable } from '../symbol/observable';
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| 11 | import { Subscription } from '../Subscription';
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| 12 | import { Subscriber } from '../Subscriber';
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| 13 |
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| 14 | export const subscribeTo = <T>(result: ObservableInput<T>): (subscriber: Subscriber<T>) => Subscription | void => {
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| 15 | if (!!result && typeof result[Symbol_observable] === 'function') {
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| 16 | return subscribeToObservable(result as any);
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| 17 | } else if (isArrayLike(result)) {
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| 18 | return subscribeToArray(result);
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| 19 | } else if (isPromise(result)) {
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| 20 | return subscribeToPromise(result as Promise<any>);
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| 21 | } else if (!!result && typeof result[Symbol_iterator] === 'function') {
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| 22 | return subscribeToIterable(result as any);
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| 23 | } else {
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| 24 | const value = isObject(result) ? 'an invalid object' : `'${result}'`;
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| 25 | const msg = `You provided ${value} where a stream was expected.`
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| 26 | + ' You can provide an Observable, Promise, Array, or Iterable.';
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| 27 | throw new TypeError(msg);
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| 28 | }
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| 29 | };
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