import { Logger as PinoLogger } from 'pino';
/**
 * The common set of `Logger` options.
 */
export type LoggerOptions = {
    /**
     * The logger name.
     */
    name: string;
    /**
     * The desired log level.
     */
    level?: LoggerLevelValue;
    /**
     * Create a logger with the fields set
     */
    fields?: Fields;
    /** log to memory instead of to a file.  Intended for Unit Testing */
    useMemoryLogger?: boolean;
};
/**
 * Standard `Logger` levels.
 *
 * **See** {@link https://getpino.io/#/docs/api?id=logger-level |Logger Levels}
 */
export declare enum LoggerLevel {
    TRACE = 10,
    DEBUG = 20,
    INFO = 30,
    WARN = 40,
    ERROR = 50,
    FATAL = 60
}
/**
 * Any numeric `Logger` level.
 */
export type LoggerLevelValue = LoggerLevel | number;
/**
 * An object
 */
export type Fields = Record<string, unknown>;
/**
 * All possible field value types.
 */
export type FieldValue = string | number | boolean | Fields;
/**
 * Log line interface
 */
export type LogLine = {
    name: string;
    hostname: string;
    pid: string;
    log: string;
    level: number;
    msg: string;
    time: string;
    v: number;
};
/**
 * A logging abstraction powered by {@link https://github.com/pinojs/pino | Pino} that provides both a default
 * logger configuration that will log to the default path, and a way to create custom loggers based on the same foundation.
 *
 * ```
 * // Gets the root sfdx logger
 * const logger = await Logger.root();
 *
 * // Creates a child logger of the root sfdx logger with custom fields applied
 * const childLogger = await Logger.child('myRootChild', {tag: 'value'});
 *
 * // Creates a custom logger unaffiliated with the root logger
 * const myCustomLogger = new Logger('myCustomLogger');
 *
 * // Creates a child of a custom logger unaffiliated with the root logger with custom fields applied
 * const myCustomChildLogger = myCustomLogger.child('myCustomChild', {tag: 'value'});
 *
 * // get a raw pino logger from the root instance of Logger
 * // you can use these to avoid constructing another Logger wrapper class and to get better type support
 * const logger = Logger.getRawRootLogger().child({name: 'foo', otherProp: 'bar'});
 * logger.info({some: 'stuff'}, 'a message');
 *
 *
 * // get a raw pino logger from the current instance
 * const childLogger = await Logger.child('myRootChild', {tag: 'value'});
 * const logger = childLogger.getRawLogger();
 * ```
 *
 * **See** https://developer.salesforce.com/docs/atlas.en-us.sfdx_setup.meta/sfdx_setup/sfdx_dev_cli_log_messages.htm
 */
export declare class Logger {
    /**
     * The name of the root sfdx `Logger`.
     */
    static readonly ROOT_NAME = "sf";
    /**
     * The default `LoggerLevel` when constructing new `Logger` instances.
     */
    static readonly DEFAULT_LEVEL = LoggerLevel.WARN;
    /**
     * A list of all lower case `LoggerLevel` names.
     *
     * **See** {@link LoggerLevel}
     */
    static readonly LEVEL_NAMES: string[];
    private static rootLogger?;
    private pinoLogger;
    private memoryLogger?;
    /**
     * Constructs a new `Logger`.
     *
     * @param optionsOrName A set of `LoggerOptions` or name to use with the default options.
     *
     * **Throws** *{@link SfError}{ name: 'RedundantRootLoggerError' }* More than one attempt is made to construct the root
     * `Logger`.
     */
    constructor(optionsOrName: LoggerOptions | string);
    /**
     *
     * Gets the root logger.  It's a singleton
     * See also getRawLogger if you don't need the root logger
     */
    static root(): Promise<Logger>;
    /**
     * Gets the root logger.  It's a singleton
     */
    static getRoot(): Logger;
    /**
     * Destroys the root `Logger`.
     *
     * @ignore
     */
    static destroyRoot(): void;
    /**
     * Create a child of the root logger, inheriting this instance's configuration such as `level`, transports, etc.
     *
     * @param name The name of the child logger.
     * @param fields Additional fields included in all log lines.
     */
    static child(name: string, fields?: Fields): Promise<Logger>;
    /**
     * Create a child of the root logger, inheriting this instance's configuration such as `level`, transports, etc.
     *
     * @param name The name of the child logger.
     * @param fields Additional fields included in all log lines.
     */
    static childFromRoot(name: string, fields?: Fields): Logger;
    /**
     * Gets a numeric `LoggerLevel` value by string name.
     *
     * @param {string} levelName The level name to convert to a `LoggerLevel` enum value.
     *
     * **Throws** *{@link SfError}{ name: 'UnrecognizedLoggerLevelNameError' }* The level name was not case-insensitively recognized as a valid `LoggerLevel` value.
     * @see {@Link LoggerLevel}
     */
    static getLevelByName(levelName: string): LoggerLevelValue;
    /** get the bare (pino) logger instead of using the class hierarchy */
    static getRawRootLogger(): PinoLogger;
    /** get the bare (pino) logger instead of using the class hierarchy */
    getRawLogger(): PinoLogger;
    /**
     * Gets the name of this logger.
     */
    getName(): string;
    /**
     * Gets the current level of this logger.
     */
    getLevel(): LoggerLevelValue;
    /**
     * Set the logging level of all streams for this logger.  If a specific `level` is not provided, this method will
     * attempt to read it from the environment variable `SFDX_LOG_LEVEL`, and if not found,
     * {@link Logger.DEFAULT_LOG_LEVEL} will be used instead. For convenience `this` object is returned.
     *
     * @param {LoggerLevelValue} [level] The logger level.
     *
     * **Throws** *{@link SfError}{ name: 'UnrecognizedLoggerLevelNameError' }* A value of `level` read from `SFDX_LOG_LEVEL`
     * was invalid.
     *
     * ```
     * // Sets the level from the environment or default value
     * logger.setLevel()
     *
     * // Set the level from the INFO enum
     * logger.setLevel(LoggerLevel.INFO)
     *
     * // Sets the level case-insensitively from a string value
     * logger.setLevel(Logger.getLevelByName('info'))
     * ```
     */
    setLevel(level?: LoggerLevelValue): Logger;
    /**
     * Compares the requested log level with the current log level.  Returns true if
     * the requested log level is greater than or equal to the current log level.
     *
     * @param level The requested log level to compare against the currently set log level.
     */
    shouldLog(level: LoggerLevelValue): boolean;
    /**
     * Gets an array of log line objects. Each element is an object that corresponds to a log line.
     */
    getBufferedRecords(): LogLine[];
    /**
     * Reads a text blob of all the log lines contained in memory or the log file.
     */
    readLogContentsAsText(): string;
    /**
     * Create a child logger, typically to add a few log record fields. For convenience this object is returned.
     *
     * @param name The name of the child logger that is emitted w/ log line.  Will be prefixed with the parent logger name and `:`
     * @param fields Additional fields included in all log lines for the child logger.
     */
    child(name: string, fields?: Fields): Logger;
    /**
     * Add a field to all log lines for this logger. For convenience `this` object is returned.
     *
     * @param name The name of the field to add.
     * @param value The value of the field to be logged.
     */
    addField(name: string, value: FieldValue): Logger;
    /**
     * Logs at `trace` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    trace(...args: any[]): Logger;
    /**
     * Logs at `debug` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    debug(...args: unknown[]): Logger;
    /**
     * Logs at `debug` level with filtering applied.
     *
     * @param cb A callback that returns on array objects to be logged.
     */
    debugCallback(cb: () => unknown[] | string): void;
    /**
     * Logs at `info` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    info(...args: unknown[]): Logger;
    /**
     * Logs at `warn` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    warn(...args: unknown[]): Logger;
    /**
     * Logs at `error` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    error(...args: unknown[]): Logger;
    /**
     * Logs at `fatal` level with filtering applied. For convenience `this` object is returned.
     *
     * @param args Any number of arguments to be logged.
     */
    fatal(...args: unknown[]): Logger;
}
export declare const computeLevel: (optionsLevel?: number | string) => string;