import LogLevel from './LogLevel';
/**
 * [[Logger]] defines how to write logs for different logging level.
 */
export default interface Logger {
    /**
     * Calls [[debugFunction]] only if the log level is debug and emits the
     * resulting string. Use the debug level to dump large or verbose messages
     * that could slow down performance.
     */
    debug(debugFunction: () => string): void;
    /**
     * Emits an info message if the log level is equal to or lower than info level.
     */
    info(msg: string): void;
    /**
     * Emits a warning message if the log level is equal to or lower than warn level.
     */
    warn(msg: string): void;
    /**
     * Emits an error message if the log level is equal to or lower than error level.
     */
    error(msg: string): void;
    /**
     * Sets the log level.
     */
    setLogLevel(level: LogLevel): void;
    /**
     * Gets the current log level.
     */
    getLogLevel(): LogLevel;
}