/** @packageDocumentation
 * @module Configuration
 */
/**
 * @public
 * @deprecated  Previously only used by the Config
 */
export declare type ValueType = string | boolean | number;
/** Helper class that manages all configuration settings for an iModel.js application.
 *
 * The static [[Config.App]] is used by many parts of the iModel.js library to retrieve configuration settings.
 *
 * The initial use of [[Config.App]] gathers configuration variables from 3 different locations:
 * 1. Sets 'imjs_env_is_browser' based on if the window is defined.
 * 1. Performs a GET request for a "config.json".  If found merges the files contents into the Config.
 * 1. Appends any environment variable that are prefixed with "imjs".
 *
 * > The order listed above is important because if there is any overlap, the last one to contain the variable will win.
 *
 * After the initial use of `Config.App`, all additional updates to the configuration must be performed using [[Config.App.add]] or [[Config.App.merge]].
 *
 * **Expanding variables** is supported using `${}` syntax.  If the variable is of type string and contains a `${}`, the rest of
 * the configuration variables are searched to populate the place of the variable.
 *  i.e. If the variable `appName='TestApp'`, a variable with a value of 'https://${appName}' will be expanded to `https://TestApp`.
 * > Does not recursively expand variables such as, `appName=${appName}`.
 *
 * @public
 */
export declare class Config {
    private static _appConfig;
    private _container;
    private _expanded;
    private constructor();
    /** Sets up the Config object by performing 3 steps, this order:
     * 1. Sets 'imjs_env_is_browser' based on if the window is defined.
     * 1. Performs a GET request for a "config.json".  If found merges the entire file.
     * 1. Appends environment variables that are prefixed with "imjs".
     */
    private appendSystemVars;
    /** Performs a case insensitive search for the variable name.
     * If the variable exists, return the variable in the casing its currently stored.
     * Otherwise, return the original name provided.
     */
    private checkExists;
    /** Expand variable containing other variables as values.
     * Nested variables are wrapped with ${}.
     *  i.e. ${test1}_${test2}
     *       ${test1}${test2}
     * This is strict function that will fail if recursion is detected or var name is not found.
     */
    private expand;
    /** Checks, case-insensitive, if a variable exists.
     */
    has(varName: string): boolean;
    /** Attempts to retrieve a variable, the search is case-insensitive.
     * @param varName The name of the config variable to find
     * @param defaultVal The default value to return if the variable does not exist.  If undefined, an exception is thrown.
     * @throws if the variable does not exist and a default value is not provided.
     */
    get(varName: string, defaultVal?: boolean | string | number): any;
    /** Retrieves a variable if it exists, otherwise returns undefined.
     */
    query(varName: string): any;
    /** Attempt to get a number type variable value.
     * @param name the variable name to retrieve.
     * @param defaultVal the value to return if the variable does not exist.
     * @throws if the variable does not exist and a default value is not provided.
     */
    getNumber(name: string, defaultVal?: number): number;
    /** Attempt to get a boolean type variable value.
     * @param name the variable name to retrieve.
     * @param defaultVal the value to return if the variable does not exist.
     * @throws if the variable does not exist and a default value is not provided.
     */
    getBoolean(name: string, defaultVal?: boolean): boolean;
    /** Attempt to get a string type variable value.
     * @param name the variable name to retrieve.
     * @param defaultVal the value to return if the variable does not exist.
     * @throws if the variable does not exist and a default value is not provided.
     */
    getString(name: string, defaultVal?: string): string;
    /** Remove a variable from the config.
     * @throws if the variable does not exist.
     */
    remove(varName: string): void;
    /** Set a new property if it does not exist or updates a property to new value.
     */
    set(varName: string, value: boolean | string | number): void;
    /** Return a list of variable names present in the config.
     */
    getVars(): string[];
    /** Merges the provided object into the config.
     * @note Overrides existing variables if already exist.  Immutable properties are skipped.
     * @throws if the provided `source` is not of type object.
     */
    merge(source: any): void;
    /** Copies the properties, recursing into object properties. Only do the translateVar at the top level. */
    private _copyProperties;
    /** Return clone of the internal property container object.
     */
    getContainer(): any;
    /** Provide singleton object for application
     */
    static get App(): Config;
}
//# sourceMappingURL=Config.d.ts.map