/**
 * Warns that a deprecated function has been used via the public
 * {@link onDeprecationWarning} / {@link onEveryDeprecationWarning} callback arrays.
 * @param message Plain-language detail about what has been deprecated. This **should not** include unique data; use {@link source}.
 * @param source A reference object to include alongside the message, e.g. `this`.
 */
export declare function warnDeprecated(message: string, source?: object): void;