export declare enum LogLevel {
    CRITICAL = 0,
    ERROR = 1,
    WARN = 2,
    INFO = 3,
    DEBUG = 4
}
export declare const LogSymbols: {
    [Level in LogLevel]: string;
};
export declare function tryParseLogLevel(text: string): LogLevel | undefined;
export interface LogSink {
    filter: LogLevel;
    handle(record: LogRecord): void;
}
export type ConsoleObject = Pick<typeof console, 'error' | 'warn' | 'info' | 'debug'>;
export type LogFormatter = (record: LogRecord) => string;
export declare class Formatter {
    static readonly sparse: LogFormatter;
    static readonly json: LogFormatter;
    static readonly pretty: LogFormatter;
    static readonly structured: LogFormatter;
    static readonly default: LogFormatter;
    private constructor();
}
export declare function tryParseFormatter(text: string): LogFormatter | undefined;
export declare class ConsoleSink implements LogSink {
    protected formatter: LogFormatter;
    protected consoleObject: ConsoleObject;
    filter: LogLevel;
    constructor(formatter?: LogFormatter, filter?: LogLevel, consoleObject?: ConsoleObject);
    handle(record: LogRecord): void;
}
export declare class InteractiveConsoleSink extends ConsoleSink {
    handle(record: LogRecord): void;
}
export type OnLogMessage = (formattedString: string, record: LogRecord) => void;
export declare class CallbackSink implements LogSink {
    protected formatter: LogFormatter;
    protected cb: OnLogMessage;
    filter: LogLevel;
    constructor(cb: OnLogMessage, formatter?: LogFormatter, filter?: LogLevel);
    handle(record: LogRecord): void;
}
export interface LoggerLike {
    readonly name: string | undefined;
    sinks: LogSink[];
    filter: LogLevel;
    parent: LoggerLike | undefined;
    log(level: LogLevel, message: string, extra?: Record<string, unknown> | undefined): void;
    insert(record: LogRecord): void;
    readonly error: (message: string, extra?: Record<string, unknown>) => void;
    readonly warn: (message: string, extra?: Record<string, unknown>) => void;
    readonly info: (message: string, extra?: Record<string, unknown>) => void;
    readonly debug: (message: string, extra?: Record<string, unknown>) => void;
}
export declare class Logger implements LoggerLike {
    #private;
    sinks: LogSink[];
    filter: LogLevel;
    parent: Logger | undefined;
    get name(): string | undefined;
    constructor(filter: LogLevel, name?: string | undefined, sinks?: LogSink[], parent?: Logger | undefined);
    log(level: LogLevel, message: string, extra?: Record<string, unknown> | undefined): void;
    insert(record: LogRecord): void;
    readonly error: (message: string, extra?: Record<string, unknown>) => void;
    readonly warn: (message: string, extra?: Record<string, unknown>) => void;
    readonly info: (message: string, extra?: Record<string, unknown>) => void;
    readonly debug: (message: string, extra?: Record<string, unknown>) => void;
}
export declare const GLOBAL_LOGGER: Logger;
export type LogFn = (message: string, extra?: Record<string, unknown> | undefined) => void;
export type LogWithLevelFn = (level: LogLevel, message: string, extra?: Record<string, unknown> | undefined) => void;
export declare const error: LogFn;
export declare const warn: LogFn;
export declare const info: LogFn;
export declare const debug: LogFn;
export declare const log: LogWithLevelFn;
export interface LogRecord {
    readonly date: Date;
    readonly level: LogLevel;
    readonly logger: LoggerLike;
    readonly message: string;
    readonly extra: Record<string, unknown> | undefined;
}