/**
 * Used to create a token that can be sent to foreigh lands a later awaited.
 * This is different from regular Promise (which this class just wraps) is that Promise does not expose `resolve` function
 * but this does. It allows you to send somewhere (e.g. in an event) a callback (the `resolve` function) and when this token is awaited
 * it will wait for the `resolve` to be called
 *
 * # Example
 *
 * ```typescript
 * const token = new ResolutionToken<void>()
 *
 * // send token elsewhere (then `resolve` is somehow called)
 * dispatch("someEvent", token.resolve) // svelte dispatch
 *
 * // awaits the call of `resolve`
 * const payloadFromParent = await token
 * ```
 */
export default class ResolutionToken<T> {
    resolve: ((x: any) => void) | null;
    reject: ((x: any) => void) | null;
    private promise;
    constructor();
    then<TRes>(callback: (x: T) => TRes | Promise<TRes>): Promise<TRes>;
}