/**
 * @file
 * Log untilies for development builds. In production builds, these functions are no-ops.
 *
 * The `log` function can be used to log messages of varying severity, and the `logOnce` function can be used to log a message only once per unique key.
 *
 * logger is opt-in - if `window.splunkui.logLevel` is not set, no messages will be logged.
 *
 * The log level can be configured by setting `window.splunkui.logLevel` to one of 'debug', 'log', 'warn', 'error', or 'fatal'.
 * If the log level is set, only messages with that level or higher severity will be logged.
 *
 */
/**
 * @public
 */
declare const consoleMethods: readonly ["debug", "log", "warn", "error"];
export type ConsoleType = (typeof consoleMethods)[number];
declare const logLevels: readonly ["debug", "log", "warn", "error", "fatal"];
export type LogLevel = (typeof logLevels)[number];
export type loggerOptions = {
    logLevel?: LogLevel;
};
export type loggerWindow = Window & {
    splunkui?: loggerOptions;
};
/**
 * Gets the current node environment, ie. 'development', 'production', etc.
 * @returns The current node environment string
 */
export declare function getNodeEnv(): string | undefined;
/**
 * In a development environment, logs a message to the console if it hasn't been logged.
 * This should be used in singleton components or situations where the warning may be needlessly releated.
 * Inside `react` components, use `log()` with a `useEffect` to log once per component instance.
 * @param type The type of console method to use ('log', 'warn', 'error')
 * @param message The message to log
 * @param {key} Unique key to identify the message (defaults to the message itself)
 * @returns true if the message was logged, false otherwise
 * @public
 */
export declare function logOnce(type: ConsoleType, message: string, key?: string): boolean;
/**
 * In a development environment, logs a message to the console.
 * @param type The type of console method to use ('log', 'warn', 'error')
 * @param message The message to log
 * @returns true if the message was logged, false otherwise
 * @public
 */
export declare function log(type: ConsoleType | 'fatal', message: string): boolean;
export {};