/** The slice of a Vite/Rollup plugin this returns. Structural, so `vite` stays an optional peer. */
export interface ServerFnStubPlugin {
    readonly name: string;
    readonly enforce: "pre";
    /** Applied only to the CLIENT build; the server build keeps the real module. */
    readonly applyToEnvironment?: (environment: {
        readonly name: string;
    }) => boolean;
    transform(code: string, id: string, options?: {
        readonly ssr?: boolean;
    }): {
        code: string;
        map: null;
    } | null;
}
/**
 * Replace every `*.fn` module with its client stubs.
 *
 * Client-only by construction: nifra passes this to the client build and the dev server, never to the
 * SSR build, because the server is what actually runs these functions.
 */
export declare function viteServerFnStub(): ServerFnStubPlugin;
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