import { type InitializedObservable } from '../core/index.mjs';
/**
 * Creates a reactive state container with getter and setter methods.
 * Provides a simple state management solution with observable state.
 *
 * @template S - The type of the state
 * @param initialState - The initial value of the state
 * @returns A 3-element tuple: `[state, setState, { updateState, resetState, getSnapshot, initialState }]`
 *
 * @example
 * ```ts
 * const [state, setState, { updateState, resetState }] = createState(0);
 *
 * const stateHistory: number[] = [];
 *
 * state.subscribe((value: number) => {
 *   stateHistory.push(value);
 * });
 *
 * assert.deepStrictEqual(stateHistory, [0]);
 *
 * setState(10); // logs: 10
 *
 * assert.deepStrictEqual(stateHistory, [0, 10]);
 *
 * updateState((prev: number) => prev + 1); // logs: 11
 *
 * assert.deepStrictEqual(stateHistory, [0, 10, 11]);
 *
 * resetState(); // logs: 0
 *
 * assert.deepStrictEqual(stateHistory, [0, 10, 11, 0]);
 * ```
 */
export declare const createState: <S>(initialState: S) => readonly [state: InitializedObservable<S>, setState: (v: S) => S, Readonly<{
    updateState: (updateFn: (prev: S) => S) => S;
    resetState: () => S;
    getSnapshot: () => S;
    initialState: S;
}>];
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