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import { IScheduler } from '../Scheduler';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
export declare type ConditionFunc<S> = (state: S) => boolean;
export declare type IterateFunc<S> = (state: S) => S;
export declare type ResultFunc<S, T> = (state: S) => T;
export interface GenerateBaseOptions<S> {
/**
* Initial state.
*/
initialState: S;
/**
* Condition function that accepts state and returns boolean.
* When it returns false, the generator stops.
* If not specified, a generator never stops.
*/
condition?: ConditionFunc<S>;
/**
* Iterate function that accepts state and returns new state.
*/
iterate: IterateFunc<S>;
/**
* IScheduler to use for generation process.
* By default, a generator starts immediately.
*/
scheduler?: IScheduler;
}
export interface GenerateOptions<T, S> extends GenerateBaseOptions<S> {
/**
* Result selection function that accepts state and returns a value to emit.
*/
resultSelector: ResultFunc<S, T>;
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export declare class GenerateObservable<T, S> extends Observable<T> {
private initialState;
private condition;
private iterate;
private resultSelector;
private scheduler;
constructor(initialState: S, condition: ConditionFunc<S>, iterate: IterateFunc<S>, resultSelector: ResultFunc<S, T>, scheduler?: IScheduler);
/**
* Generates an observable sequence by running a state-driven loop
* producing the sequence's elements, using the specified scheduler
* to send out observer messages.
*
* <img src="./img/generate.png" width="100%">
*
* @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>
* var res = Rx.Observable.generate(0, x => x < 10, x => x + 1, x => x);
*
* @example <caption>Using asap scheduler, produces sequence of 2, 3, 5, then completes.</caption>
* var res = Rx.Observable.generate(1, x => x < 5, x => x * 2, x => x + 1, Rx.Scheduler.asap);
*
* @see {@link from}
* @see {@link create}
*
* @param {S} initialState Initial state.
* @param {function (state: S): boolean} condition Condition to terminate generation (upon returning false).
* @param {function (state: S): S} iterate Iteration step function.
* @param {function (state: S): T} resultSelector Selector function for results produced in the sequence.
* @param {Scheduler} [scheduler] A {@link IScheduler} on which to run the generator loop. If not provided, defaults to emit immediately.
* @returns {Observable<T>} The generated sequence.
*/
static create<T, S>(initialState: S, condition: ConditionFunc<S>, iterate: IterateFunc<S>, resultSelector: ResultFunc<S, T>, scheduler?: IScheduler): Observable<T>;
/**
* Generates an observable sequence by running a state-driven loop
* producing the sequence's elements, using the specified scheduler
* to send out observer messages.
* The overload uses state as an emitted value.
*
* <img src="./img/generate.png" width="100%">
*
* @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>
* var res = Rx.Observable.generate(0, x => x < 10, x => x + 1);
*
* @example <caption>Using asap scheduler, produces sequence of 1, 2, 4, then completes.</caption>
* var res = Rx.Observable.generate(1, x => x < 5, x => x * 2, Rx.Scheduler.asap);
*
* @see {@link from}
* @see {@link create}
*
* @param {S} initialState Initial state.
* @param {function (state: S): boolean} condition Condition to terminate generation (upon returning false).
* @param {function (state: S): S} iterate Iteration step function.
* @param {Scheduler} [scheduler] A {@link IScheduler} on which to run the generator loop. If not provided, defaults to emit immediately.
* @returns {Observable<S>} The generated sequence.
*/
static create<S>(initialState: S, condition: ConditionFunc<S>, iterate: IterateFunc<S>, scheduler?: IScheduler): Observable<S>;
/**
* Generates an observable sequence by running a state-driven loop
* producing the sequence's elements, using the specified scheduler
* to send out observer messages.
* The overload accepts options object that might contain initial state, iterate,
* condition and scheduler.
*
* <img src="./img/generate.png" width="100%">
*
* @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>
* var res = Rx.Observable.generate({
* initialState: 0,
* condition: x => x < 10,
* iterate: x => x + 1
* });
*
* @see {@link from}
* @see {@link create}
*
* @param {GenerateBaseOptions<S>} options Object that must contain initialState, iterate and might contain condition and scheduler.
* @returns {Observable<S>} The generated sequence.
*/
static create<S>(options: GenerateBaseOptions<S>): Observable<S>;
/**
* Generates an observable sequence by running a state-driven loop
* producing the sequence's elements, using the specified scheduler
* to send out observer messages.
* The overload accepts options object that might contain initial state, iterate,
* condition, result selector and scheduler.
*
* <img src="./img/generate.png" width="100%">
*
* @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>
* var res = Rx.Observable.generate({
* initialState: 0,
* condition: x => x < 10,
* iterate: x => x + 1,
* resultSelector: x => x
* });
*
* @see {@link from}
* @see {@link create}
*
* @param {GenerateOptions<T, S>} options Object that must contain initialState, iterate, resultSelector and might contain condition and scheduler.
* @returns {Observable<T>} The generated sequence.
*/
static create<T, S>(options: GenerateOptions<T, S>): Observable<T>;
/** @deprecated internal use only */ _subscribe(subscriber: Subscriber<any>): Subscription | Function | void;
private static dispatch<T, S>(state);
}