Types for route inputs

[Blechlawine]

Describe the feature

Since Nitro generates some types for the response of routes, it would be great if it could also generate types for the input.
As an example:

// routes/index.ts
// This is just a normal eventhandler
export default defineEventHandler(async (event) => {
    const { greet } = (await readBody(event)) satisfies Input;
    return {
        hello: greet,
    };
});
// here comes the fun part:
export type Input = {
    greet: string;
};

Nitro already generates the types for the response from the event handler:

// .nitro/types/nitro.d.ts
interface InternalApi {
    '/': Awaited<ReturnType<typeof import('../../routes/index').default>>
}

With the types for the input this could look something like this:

interface InternalApi {
    '/': Awaited<ReturnType<typeof import('../../routes/index').default>>
}
interface InternalApiInputs {
    '/': import("../../routes/index").Input
}

Additional information

• Would you be willing to help implement this feature?

[pi0]

Lets track in #2758