/** Engine-neutral process primitives for short-lived workflow workers. */
import type { WorkerToDaemon } from '../../types.js';
export interface WorkerHandle {
    send(msg: unknown): void;
    on(event: 'message', cb: (msg: WorkerToDaemon) => void): void;
    on(event: 'exit', cb: (code: number | null) => void): void;
    /** ChildProcess `close` is the outer-process resource fence. Unlike `exit`,
     * it is also emitted after a spawn `error` once stdio/IPC are closed. */
    on(event: 'close', cb: (code: number | null) => void): void;
    on(event: 'error', cb: (err: Error) => void): void;
    kill(signal?: NodeJS.Signals): void;
    readonly pid?: number;
    readonly stdout?: NodeJS.ReadableStream | null;
    readonly stderr?: NodeJS.ReadableStream | null;
}
export interface WorkerProcessFactory {
    spawn(opts: WorkerSpawnOptions): WorkerHandle;
}
export type WorkerSpawnOptions = {
    workerPath: string;
    cwd: string;
    env: NodeJS.ProcessEnv;
};
/** Default factory: real `node:child_process.fork` against `worker.js`. */
export declare const forkWorkerJsFactory: WorkerProcessFactory;
export declare function expandWorkflowWorkingDir(workingDir: string | undefined): string | undefined;
/** Deterministically map any string id to a UUID-v4-shaped hex token. */
export declare function syntheticSessionUuid(rawId: string): string;
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