/**
 * Helpers for Lambda-shaped runtimes (AWS API Gateway proxy events, Netlify
 * Functions, classic GCP). Bodies arrive as strings (optionally base64) and
 * responses are `{ statusCode, headers, body: string }` shapes.
 */
export interface LambdaLikeEvent {
    body: string | null;
    isBase64Encoded?: boolean;
}
export interface LambdaResult {
    statusCode: number;
    headers?: {
        [key: string]: string;
    };
    body: string;
}
/**
 * Decode an API Gateway / Netlify body, supporting base64 payloads. Throws
 * `SyntaxError` on malformed JSON so callers can map it to a 400 cleanly.
 */
export declare function decodeLambdaBody(event: LambdaLikeEvent): unknown;
/** Lambda-shaped JSON response shorthand. */
export declare function lambdaResponse(statusCode: number, body: unknown, headers: Record<string, string>): LambdaResult;