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import { Observable } from '../Observable';
import { SchedulerAction, SchedulerLike } from '../types';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
/**
* Convert an object into an Observable of `[key, value]` pairs.
*
* <span class="informal">Turn entries of an object into a stream.</span>
*
* <img src="./img/pairs.png" width="100%">
*
* `pairs` takes an arbitrary object and returns an Observable that emits arrays. Each
* emitted array has exactly two elements - the first is a key from the object
* and the second is a value corresponding to that key. Keys are extracted from
* an object via `Object.keys` function, which means that they will be only
* enumerable keys that are present on an object directly - not ones inherited
* via prototype chain.
*
* By default these arrays are emitted synchronously. To change that you can
* pass a {@link SchedulerLike} as a second argument to `pairs`.
*
* @example <caption>Converts a javascript object to an Observable</caption>
* ```javascript
* const obj = {
* foo: 42,
* bar: 56,
* baz: 78
* };
*
* pairs(obj)
* .subscribe(
* value => console.log(value),
* err => {},
* () => console.log('the end!')
* );
*
* // Logs:
* // ["foo": 42],
* // ["bar": 56],
* // ["baz": 78],
* // "the end!"
* ```
*
* @param {Object} obj The object to inspect and turn into an
* Observable sequence.
* @param {Scheduler} [scheduler] An optional IScheduler to schedule
* when resulting Observable will emit values.
* @returns {(Observable<Array<string|T>>)} An observable sequence of
* [key, value] pairs from the object.
*/
export declare function pairs<T>(obj: Object, scheduler?: SchedulerLike): Observable<[string, T]>;
/** @internal */
export declare function dispatch<T>(this: SchedulerAction<any>, state: {
keys: string[];
index: number;
subscriber: Subscriber<[string, T]>;
subscription: Subscription;
obj: Object;
}): void;
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