/** Process-facing input and output used by a command-line app. */
export interface ProcessIO {
    /** Available terminal width when output is attached to a sized terminal. */
    readonly columns?: number;
    readonly isInteractive: boolean;
    error(...values: readonly unknown[]): void;
    log(...values: readonly unknown[]): void;
    question(prompt: string): Promise<string>;
    warn(...values: readonly unknown[]): void;
}
/** Control-flow signal used when a non-terminating host records an immediate exit. */
export declare class ProcessExitError extends Error {
    readonly exitCode: number;
    constructor(exitCode: number);
}
/**
 * Structural process boundary for a command-line app.
 *
 * Production implementations may terminate from {@link exit}; recording hosts
 * may return after retaining the requested status.
 */
export interface ProcessHost {
    /** Full argument vector, including the executable and script entries. */
    readonly argv: readonly string[];
    /** Environment visible to this app invocation. */
    readonly environment: Readonly<Record<string, string | undefined>>;
    readonly io: ProcessIO;
    readonly isDevelopment: boolean;
    exit(code: number): void;
    onInterrupt(listener: () => Promise<void> | void): () => void;
}
/**
 * Requests immediate process termination and prevents a recording host from
 * accidentally continuing through code that follows the exit point.
 */
export declare function exitProcess(host: Pick<ProcessHost, 'exit'>, exitCode: number): never;
//# sourceMappingURL=ProcessHost.d.ts.map