import { Request, Response } from 'express';
/**
 * Log level possibilities.
 */
export type LogLevel = 'error' | 'warn' | 'info' | 'debug' | 'trace';
/**
 * Generic string template type for supporting string interpolation
 * with context args.
 */
export type StringTemplate = ((context: LoggerContext) => string) | string;
/**
 * Hash map for managing context.
 */
export type LoggerContext = Record<string, unknown>;
/**
 * Hash map for adding context in message props.
 */
export type MessageContext = {
    /**
     * Context to be embed to msg
     */
    ctx?: Record<string, unknown>;
};
/**
 * Logger transport type
 */
export declare enum LoggerTransport {
    StdoutPlain = "plain",
    StdoutPretty = "pretty",
    StdoutJson = "json"
}
/**
 * Logger global config
 */
export type GlobalLoggerConfig = {
    /**
     * Global prefixes
     */
    prefixes?: StringTemplate[];
    /**
     * Global manager for logging the context within the message
     */
    shouldLogContext?: boolean;
    /**
     * Log transport
     */
    transport?: LoggerTransport;
    /**
     * Minimum log level
     */
    logLevel?: LogLevel;
};
/**
 * Logger instance config
 */
export type LoggerConfig = {
    /**
     * Instance prefixes
     */
    prefixes?: StringTemplate[];
};
/**
 * Default transport log function.
 */
type transportLogFunc = (
/**
 * Prefix of the message
 */
prefix: string, 
/**
 * Actual log message
 */
message: string, 
/**
 * Additional properties added to log JSON
 */
additionalProperties?: Record<string, unknown>) => void;
/**
 * Defines interface for a Transport implementation
 */
export interface TransportStrategy {
    /**
     * Define minimum log level following the sequence 'error' > 'warn' > 'info' > 'debug' > 'trace'
     */
    setMinLogLevel: (level: LogLevel) => void;
    /**
     * Get minimum log level enabled
     */
    getMinLogLevel: () => LogLevel;
    /**
     * Print message of 'info' log level
     */
    info: transportLogFunc;
    /**
     * Print message of 'debug' log level
     */
    debug: transportLogFunc;
    /**
     * Print message of 'warn' log level
     */
    warn: transportLogFunc;
    /**
     * Print message of 'trace' log level
     */
    trace: transportLogFunc;
    /**
     * Print message of 'error' log level
     */
    error: transportLogFunc;
}
/**
 * Options for logging HTTP Requests
 */
export type RequestLoggerOptions = {
    request: Request;
    response: Response;
    context?: LoggerContext;
    level?: LogLevel;
};
export {};