/**
 * Makes a simple GET request and returns the entire response as a Buffer.
 * - Throws if the response status is not 200.
 * - Applies a 3000 ms timeout when `isDev` is `true`.
 */
export declare function fetchResource(url: string, isDev: boolean, errorMessage?: string): Promise<Buffer>;
/**
 * Fetches the CSS containing the @font-face declarations from Google Fonts.
 * The fetch has a user agent header with a modern browser to ensure we'll get .woff2 files.
 *
 * The env variable FONT_GOOGLE_MOCKED_RESPONSES may be set containing a path to mocked data.
 * It's used to define mocked data to avoid hitting the Google Fonts API during tests.
 */
export declare function fetchCSSFromGoogleFonts(url: string, fontFamily: string, isDev: boolean): Promise<string>;
/**
 * Fetches a font file and returns its contents as a Buffer.
 * If NEXT_FONT_GOOGLE_MOCKED_RESPONSES is set, we handle mock data logic.
 */
export declare function fetchFontFile(url: string, isDev: boolean): Promise<Buffer>;
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