/**
 * The lowercased `type/subtype` essence of a Content-Type value, or `undefined`
 * when the value isn't exactly one well-formed media type. A comma is refused
 * outright: browsers resolve a comma-separated list to its *last* entry, so
 * `image/png, text/html` renders as HTML while a check that reads up to the
 * first `;` sees an image. Control characters are refused for the same reason
 * a header would be.
 */
export declare const mediaTypeEssence: (value: string) => string | undefined;
//# sourceMappingURL=media-type.d.ts.map