/// <reference types="node" />
import { AsyncLocalStorage } from 'async_hooks';
import { ILogger } from './ILogger';
import { LogFormatter } from './types/LogFormatter';
import { LogEntryMetadata } from './types/LogEntryMetadata';
import { Severity } from './types/Severity';
export declare class Logger implements ILogger {
    /**
     * Global log level
     */
    protected static level: Severity;
    /**
     * Global default user labels
     */
    protected static labels: Record<string, string | undefined>;
    /**
     * Default context logger
     */
    protected static appLogger: Logger;
    /**
     * Stores logger references in async storage
     */
    protected static storage: AsyncLocalStorage<Logger>;
    /**
     * A formatter function which takes a log entry and formats it to a string
     */
    protected static formatter: LogFormatter;
    /**
     * Sets a global log level
     */
    static setLevel(level: Severity): void;
    /**
     * Sets global default user labels
     */
    static setLabels(labels: Record<string, string | undefined>): void;
    /**
     * Returns global default user labels
     */
    static getLabels(): Record<string, string | undefined>;
    /**
     * Sets a global formatter function to replace the default JSON.stringify based formatter.
     * This can be useful for developers running the application locally and presenting logs in
     * a more developer-friendly form.
     */
    static setFormatter(formatter?: LogFormatter): void;
    /**
     * Calls a function with a given logger
     */
    static runWith<T extends (...args: any[]) => any>(logger: Logger, cb: T): ReturnType<T>;
    /**
     * Returns logger from async context
     * @returns
     */
    static getLogger(): Logger;
    /**
     * Logger unique identifier
     */
    protected readonly name: string;
    /**
     * Logger default user labels
     */
    protected labels: Record<string, string | undefined>;
    constructor(name?: string, labels?: Record<string, string | undefined>);
    log(severity: Severity, message: string, meta?: LogEntryMetadata): void;
    default(message: string, meta?: LogEntryMetadata): void;
    debug(message: string, meta?: LogEntryMetadata): void;
    info(message: string, meta?: LogEntryMetadata): void;
    notice(message: string, meta?: LogEntryMetadata): void;
    warning(message: string, meta?: LogEntryMetadata): void;
    error(message: string, meta?: LogEntryMetadata): void;
    critical(message: string, meta?: LogEntryMetadata): void;
    alert(message: string, meta?: LogEntryMetadata): void;
    emergency(message: string, meta?: LogEntryMetadata): void;
    static log(severity: Severity, message: string, meta?: LogEntryMetadata): void;
    static default(message: string, meta?: LogEntryMetadata): void;
    static debug(message: string, meta?: LogEntryMetadata): void;
    static info(message: string, meta?: LogEntryMetadata): void;
    static notice(message: string, meta?: LogEntryMetadata): void;
    static warning(message: string, meta?: LogEntryMetadata): void;
    static error(message: string, meta?: LogEntryMetadata): void;
    static critical(message: string, meta?: LogEntryMetadata): void;
    static alert(message: string, meta?: LogEntryMetadata): void;
    static emergency(message: string, meta?: LogEntryMetadata): void;
    static getName(): string;
    setLabels(labels: Record<string, string | undefined>): void;
    getLabels(): Record<string, string | undefined>;
    getName(): string;
}
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