export interface RenderProcess {
    readonly pid: number | undefined;
    readonly stdout: ReadableStream<Uint8Array> | undefined;
    readonly stderr: ReadableStream<Uint8Array>;
    /** Resolves after the process and its stdio handles have closed. */
    readonly exited: Promise<number>;
    kill(): void;
}
/** Share Node's pipe ownership with Playwright, and drain handles before reusing a worker. */
export declare function spawnRenderProcess(args: readonly string[], options: {
    stdout: "pipe" | "ignore";
    stderr: "pipe";
    signal?: AbortSignal;
}): Promise<RenderProcess>;
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