/**
 * Prefixes the given endpoint with the `defaultProtocol` if one isn't defined already.
 *
 * @param endpoint
 * @param defaultProtocol defaults to "https://"
 * @returns the endpoint, which will always have a protocol
 */
export declare function withDefaultProtocol(endpoint: string, defaultProtocol?: string): string;
export declare function withDefaultProtocol(endpoint: string | undefined, defaultProtocol?: string): string | undefined;
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