/** MIME resolver; `undefined` means the resolver declines and a later resolver may decide. */
export type MimeResolver = (ctx: {
    path: string;
    declared?: string;
    /** Read a bounded prefix only; this callback cannot read the whole file. */
    peek: (bytes: number) => Promise<Uint8Array>;
}) => string | undefined | Promise<string | undefined>;
/** MIME resolver schema. */
export declare const mimeResolverSchema: import("@nhtio/validation").AnySchema<any>;
/** MIME resolver guard. */
export declare const implementsMimeResolver: (v: unknown) => v is MimeResolver;