import { type Readable, type Signal } from '@vielzeug/ripple';
/**
 * Creates a local writable `Signal<T>` that stays in sync with an external
 * `Reactive<T>`. When `abortSignal` is provided the watcher subscription
 * is disposed automatically on abort; otherwise the caller is responsible for
 * disposal.
 *
 * Initialised synchronously via `untrack` so the first render never reads a
 * stale value. The optional `transform` coerces each incoming value (e.g.
 * `Boolean`, `String`).
 *
 * @example
 * ```ts
 * const value = syncedSignal(options.value, options.signal, (v) => String(v ?? ''));
 * // Without lifecycle signal (test / non-component context):
 * const value = syncedSignal(source);
 * ```
 */
export declare const syncedSignal: <TIn, TOut = TIn>(source: Readable<TIn>, abortSignal?: AbortSignal, transform?: (value: TIn) => TOut) => Signal<TOut>;
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