/**
 * Checks if a message event is from a supported app source.
 *
 * @param evt - The message event to check
 * @returns true if the event is from a supported app source, false otherwise
 */
export declare function isSupportedAppSource(evt: MessageEvent<{
    type?: string;
    source?: string;
}>): boolean;
//# sourceMappingURL=supported-app-sources.d.ts.map