import { type LogEntry } from "@thi.ng/logger/api";
import type { Transducer } from "@thi.ng/transducers";
import type { BodyFormat, DateFormat, LogEntryObj } from "./api.js";
export declare const isoDate: (dt: number) => string;
/**
 * Log entry formatter/transducer. Formats a {@link LogEntry} tuple as string
 * using optionally provided formatters.
 *
 * @remarks
 * If `wrap` is given, it will be called with both the already formatted message
 * string and the original log entry. The function can be used to post-process
 * the message (e.g. to wrap it in ANSI color escape sequences, based on logger
 * ID and/or level, also see [thi.ng/text-format](https://thi.ng/text-format))
 *
 * @param dateFmt
 * @param bodyFmt
 * @param wrap
 */
export declare const formatString: (dateFmt?: DateFormat, bodyFmt?: BodyFormat, wrap?: (msg: string, entry: LogEntry) => string) => Transducer<LogEntry, string>;
/**
 * Takes an array of regex patterns and optional `mask` string. Returns
 * transducer which replaces all found pattern occurrences with `mask`.
 * Intended to be used in combination / after {@link formatString} to avoid
 * leaking of sensitive information via logged messages.
 *
 *
 * @example
 * ```ts tangle:../export/mask-secrets.ts
 * import {
 *   Logger, formatString, maskSecrets, writeConsole
 * } from "@thi.ng/rstream-log";
 *
 * const logger = new Logger();
 *
 * logger.stream.transform(
 *   formatString(),
 *   maskSecrets([/(?<=[A-Z0-9_]\=)\w+/g])
 * ).subscribe(
 *   writeConsole()
 * );
 *
 * logger.info("logged in USER=toxi, using TOKEN=123456");
 * // [INFO] logger-0: 2024-06-21T12:22:58.004Z  logged in USER=****, using TOKEN=****
 * ```
 *
 * @param patterns -
 * @param mask -
 */
export declare const maskSecrets: (patterns: RegExp[], mask?: string) => Transducer<string, string>;
/**
 * Log entry transducer which converts a {@link LogEntry} tuple to a
 * {@link LogEntryObj}.
 */
export declare const formatObject: () => Transducer<LogEntry, LogEntryObj>;
/**
 * Log entry formatter/transducer. Format a {@link LogEntry} tuple into a
 * serialized JSON string (object keys: `id`, `level`, `time`, `body`), with the
 * entry's timestamp formatted using given `dateFmt` (default: {@link isoDate}).
 *
 * @param dateFmt
 */
export declare const formatJSON: (dateFmt?: DateFormat) => Transducer<LogEntry, string>;
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