type Command = 'generate' | 'migrate' | 'status' | 'drift' | 'check' | 'plugin' | 'query';
/** Whether any JSON payload (success or error) has already been written to stdout. */
export declare function hasEmittedJson(): boolean;
export declare function printOutput(value: unknown, jsonMode: boolean): void;
export declare function emitJson<T extends object>(command: Command, payload: T): void;
export interface JsonError {
    code: string;
    message: string;
    hint?: string;
}
export interface JsonErrorEnvelope {
    command: string;
    schemaVersion: number;
    ok: false;
    error: JsonError;
}
export declare function buildJsonErrorEnvelope(command: string, error: JsonError): JsonErrorEnvelope;
/**
 * Emit a stable machine-readable error envelope to stdout for `--json` consumers.
 * Without this, a thrown error left stdout empty and printed plain text to
 * stderr, breaking any pipe to `jq` on the first failure.
 */
export declare function emitJsonError(command: string, error: JsonError): void;
export {};
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