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picklemik

•Created by picklemik on 5/3/2025 in #questions

Can't infer type of schema when using "scope"

I am using arktype to parse data from incoming web requests. I define the schema and the parsed result will be passed into my handler. It looks like this and is working perfectly fine right now:

server.endpoint({
    url: "PUT /admin/user/:id",
    auth: "basic",
    params: type({
      id: "string",
    }),
    query: type({
      "year?": "string.integer.parse",
    }),
    form: type({
      firstName: "string",
      lastName: "string",
      code: "string",
    })
    async handler(req, reply) {
        // req.params has the infered type from the schema, e.g. { id: string }
    }

server.endpoint({
    url: "PUT /admin/user/:id",
    auth: "basic",
    params: type({
      id: "string",
    }),
    query: type({
      "year?": "string.integer.parse",
    }),
    form: type({
      firstName: "string",
      lastName: "string",
      code: "string",
    })
    async handler(req, reply) {
        // req.params has the infered type from the schema, e.g. { id: string }
    }

What I want to do now is change id in the params schema to not be a string, but instead define my own "objectId" value. It would parse the string into a mongo ObjectId object, so I don't have to do that in the handler. I believe scopes are what I am looking for, so I tried doing that, but it breaks my type system and I don't understand why. I recreated the issue I have in this playground: https://tinyurl.com/arktype

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