import type { Middleware } from "./types.js";
/** Public API contract for log format. */
export type LogFormat = "combined" | "common" | "dev" | "short" | "tiny" | "json";
/** Options accepted by logger. */
export interface LoggerOptions {
    format?: LogFormat;
    skip?: (req: Request) => boolean;
    log?: (message: string) => void;
}
/**
 * Strip CR/LF/tab/other control characters and cap length before a user-controlled
 * header value is written to a log entry. Prevents log injection (CWE-117).
 *
 * Exported for direct unit testing — Deno's `Request` constructor rejects CR/LF
 * in header values, so the helper must be tested without going through `Request`.
 */
export declare function sanitizeHeaderForLog(value: string): string;
/** Create request logging middleware. */
export declare function logger(options?: LoggerOptions): Middleware;
/** Create development request logging middleware. */
export declare function devLogger(): Middleware;
/** Create production request logging middleware. */
export declare function prodLogger(): Middleware;
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