import * as winston from 'winston';
export declare const setRootLoggerRedactionList: (redactions: Iterable<string>) => void;
/**
 * A winston formatting function that finds occurrences of filteredKeys
 * and replaces them with the corresponding identifier.
 *
 * @public
 */
export declare function redactWinstonLogLine(info: winston.Logform.TransformableInfo): winston.Logform.TransformableInfo;
/**
 * Creates a pretty printed winston log formatter.
 *
 * @public
 */
export declare const coloredFormat: winston.Logform.Format;
/**
 * Creates a default "root" logger. This also calls {@link setRootLogger} under
 * the hood.
 *
 * @remarks
 *
 * This is the logger instance that will be the foundation for all other logger
 * instances passed to plugins etc, in a given backend.
 *
 * @public
 */
export declare function createRootLogger(options?: winston.LoggerOptions, env?: NodeJS.ProcessEnv): winston.Logger;