/**
 * Child-side record of whether the host is quitting on purpose.
 *
 * The host stops the engine by closing stdin and then sending SIGTERM, and a host
 * that was itself signalled stops it the same way, so the child cannot infer the cause
 * from how it was stopped. The host announces an explicit quit first and waits for the
 * acknowledgement, which makes the flag visible before any stop signal can arrive.
 */
export declare class EngineQuitIntent {
    private explicit;
    private readonly send;
    constructor(send: (line: string) => void);
    get explicitQuitRequested(): boolean;
    handleLine(line: string): boolean;
}
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