issue with RequestBody type helper on "multipart/form-data"

[Kevin-Ethiqais]

Environment

• Operating System: Darwin
• Node Version: v24.10.0
• Nuxt Version: 4.1.2
• CLI Version: 3.28.0
• Nitro Version: 2.12.6
• Package Manager: [email protected]
• Builder: -
• User Config: devtools, typescript, css, compatibilityDate, devServer, vite, runtimeConfig, app, ui, openFetch, scripts, piniaPluginPersistedstate, modules, sentry, sourcemap
• Runtime Modules: @nuxt/[email protected], [email protected], @pinia/[email protected], pinia-plugin-persistedstate/[email protected], @sentry/nuxt/[email protected], @nuxt/[email protected], @nuxt/[email protected], [email protected]
• Build Modules: -

Reproduction

documents_create: {
    parameters: {
        query?: never;
        header?: never;
        path?: never;
        cookie?: never;
    };
    requestBody: {
        content: {
            "multipart/form-data": components["schemas"]["DocumentUploadRequest"];
        };
    };
    responses: {
        201: {
            content: {
                "application/json": components["schemas"]["DocumentUpload"];
            };
        };
    };
};

Describe the bug

The type helper to get an request body is based on content: { 'application/json': infer U } so if I use something else than 'application/json' it always return undefined.

Additional context

No response

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