/**
 * Log levels.
 *
 * Note: Currently, this acts like a bit set, where the upper 4 bits of an
 * unsigned 16 bit value are the log level flags.
 */
export declare enum LogLevel {
    CERR_FATAL = 32768,
    CERR_ERROR = 16384,
    CERR_WARNING = 8192,
    CERR_INFO = 0
}
/**
 * Error codes. Use these when logging messages.
 *
 * Extends https://github.com/keymanapp/keyman/blob/99db3c0d2448f448242e6397f9d72e9a7ccee4b9/windows/src/global/inc/Comperr.h
 */
export declare enum KeymanCompilerError {
    CERR_LEXICAL_MODEL_MIN = 2048,
    CERR_LEXICAL_MODEL_MAX = 2303,
    CERR_FATAL_LM = 34816,
    CERR_ERROR_LM = 18432,
    CERR_WARN_LM = 10240,
    CWARN_MixedNormalizationForms = 10241,
    CWARN_DuplicateWordInSameFile = 10242,
    CWARN_TooManyErrorsOrWarnings = 8359
}
/**
 * How many errors or warnings are too many!
 */
export declare const MAX_MESSAGES = 100;
/**
 * Logs compiler messages (warnings, errors, logs).
 *
 * @param code Error code
 * @param message A helpful message!
 * @param source [optional] the filename/line number in the source that induced this error
 *
 * @see https://github.com/keymanapp/keyman/blob/99db3c0d2448f448242e6397f9d72e9a7ccee4b9/windows/src/developer/TIKE/project/Keyman.Developer.System.Project.ProjectLog.pas#L60-L77
 */
export declare function log(code: KeymanCompilerError, message: string, source?: FilenameAndLineNo): void;
/**
 * Override where log messages go.
 *
 * @param fn The desired log message handler.
 */
export declare function redirectLogMessagesTo(fn: (log: LogMessage) => void): void;
/**
 * Reset the log message handler to the default.
 */
export declare function resetLogMessageHandler(): void;
/**
 * Prints log messages to stdout. The default log action.
 */
export declare function printLogs(log: LogMessage): void;
/**
 * Duct tapes together a filename and a line number of a log.
 */
interface FilenameAndLineNo {
    readonly filename: string;
    readonly lineno: number;
}
/**
 * A log message that knows how to format itself.
 */
export interface LogMessage {
    readonly code: KeymanCompilerError;
    readonly level: LogLevel;
    readonly message: string;
    format(): string;
}
export {};