/**
 * Indicates the severity of a log message.
 *
 * Log Levels are ordered in increasing severity. So `Debug` is more severe than
 * `Trace`, etc.
 */
export declare enum LogLevel {
    /** Log level for very low severity diagnostic messages. */
    Trace = 0,
    /** Log level for low severity diagnostic messages. */
    Debug = 1,
    /** Log level for informational diagnostic messages. */
    Information = 2,
    /** Log level for diagnostic messages that indicate a non-fatal problem. */
    Warning = 3,
    /** Log level for diagnostic messages that indicate a failure in the current operation. */
    Error = 4,
    /**
     * Log level for diagnostic messages that indicate a failure that will
     * terminate the entire application.
     */
    Critical = 5,
    /**
     * The highest possible log level. Used when configuring logging to indicate
     * that no log messages should be emitted.
     */
    None = 6
}
/** An abstraction that provides a sink for diagnostic messages. */
export interface ILogger {
    /**
     * Called by the framework to emit a diagnostic message.
     *
     * @param {LogLevel} logLevel The severity level of the message.
     * @param {string} message The message.
     */
    log(logLevel: LogLevel, message: string): void;
}
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