What's preventing this function from deducing the type?

I'm currently utilizing the "openapi-typescript" tool to automatically generate all the types based on my swagger server specifications. In this process, I have created a Type called "GetUrls" which contains all the keys associated with the "get" method.

import { paths } from '../types/swagger.js'

...

type GetPaths = FilterPaths<paths, 'get'>
type GetUrls = keyof GetPaths & string

...

const get = async (url: GetUrls, params: Params) => {
    //mapping over params
    let path = ''
    for (let param in params) {
        path = url.replace('{' + param + '}', params[param])
    }

    type Schema = GetPaths[typeof url]['get']['responses']['200']['content']['*/*']

    return (await axios.get<Schema>(path)).data
}

get('/api/user/{id}', { id: '123' }).then(data => console.log(data))

Although the autocompletion feature for the function "get" is working seamlessly, there seems to be an issue with the type inference.

Interestingly, when I manually include the "url" index, the functionality works as expected:

type Schema = GetPaths['/api/user/{id}']['get']['responses']['200']['content']['*/*']

Answer №1

Resolved

In my solution, I implemented a generic function that enhances the functionality of GetUrls

fetchData = async <U extends GetUrls & string>(url: U, options: Options, useCache = false) => {
    ...
    type DataSchema = paths[U]['get']['responses'][200]['content']['*/*']
    return (await axios.get<DataSchema>(url)).data
}

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