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>;
    protected _subscribe(subscriber: Subscriber<any>): Subscription | Function | void;
    private static dispatch<T, S>(state);
}
