import type { ObservableLike } from "./Observable.js";
export declare class EmptyError extends Error {
    readonly name = "EmptyError";
}
/**
 * Transforms an observable into a promise that resolves with the first emitted
 * value from the observable. If the observable errors the promise is rejected.
 * If the observable completes without ever emitting a value the promise is
 * rejected with an `EmptyError`.
 *
 * Be careful transforming an observable into a promise. If the observable never
 * emits the promise will never resolve.
 */
export declare function firstValueFrom<T>(observable: ObservableLike<T>): Promise<T>;
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