import { type InitializedSourceObservable, type SourceObservable } from '../types/index.mjs';
/**
 * Creates a new Observable source that can manually emit values.
 * This is the primary way to create root observables that start reactive chains.
 *
 * @template A - The type of values emitted by the source
 * @returns A SourceObservable that can emit values via `.next()` method
 *
 * @example
 * ```ts
 * //  Timeline:
 * //
 * //  count$    1     2     3     ...
 * //
 * //  Explanation:
 * //  - source creates a new observable that you can manually emit values to
 * //  - Use .next() to emit values
 * //  - Foundation for building custom observables
 *
 * const count$ = source<number>();
 *
 * const valueHistory: number[] = [];
 *
 * count$.subscribe((value) => {
 *   valueHistory.push(value);
 * });
 *
 * count$.next(1); // logs: 1
 *
 * assert.deepStrictEqual(valueHistory, [1]);
 *
 * count$.next(2); // logs: 2
 *
 * assert.deepStrictEqual(valueHistory, [1, 2]);
 *
 * count$.next(3); // logs: 3
 *
 * assert.deepStrictEqual(valueHistory, [1, 2, 3]);
 * ```
 */
export declare function source<const A>(initialValue: A): InitializedSourceObservable<A>;
export declare function source<const A>(): SourceObservable<A>;
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