/** Minimal internal diagnostics sink used by query runtimes. */
export interface DiagnosticsSink {
    record(message: string, error?: unknown): void;
}
export type SdkDiagnosticsOptions = {
    debug?: boolean;
    debugFile?: string;
    stderr?: (data: string) => void;
};
export declare function isSdkDiagnosticsEnabled(options: SdkDiagnosticsOptions): boolean;
export declare function resolveSdkDiagnosticsFilePath(options: SdkDiagnosticsOptions): string | undefined;
export declare class SdkDiagnostics implements DiagnosticsSink {
    private readonly enabled;
    private readonly debugFile?;
    private readonly stderr?;
    constructor(options?: SdkDiagnosticsOptions);
    record(message: string, error?: unknown): void;
    get filePath(): string | undefined;
    private writeToFile;
    private writeToStderr;
    private formatLine;
    private formatError;
}