[Feature] add support for changing model property casing

[tolgap]

Some of us are "forced" to use APIs that accept and return PascalCase models.

It would be amazing if a --transformModelCase option was added. It would support snake, pascal, camel.

It would allow us to change a model from:

interface MyModel {
  Id: string;  
}

to

interface MyModel {
  id: string;
}

Of course, if casings are changed at the model level, this needs to be "reset" at the body/query level as well. Another option for this could be provided: --transformRequestCase and/or --transformResponseCase.

Or perhaps someone else has a better idea on how this could be achieved. I would love to know if anyone managed to get around this.

[devraj]

@tolgap I added some thoughts to this ticket ticket, we use Python and achieved this by transforming the output in the OpenAPI schema on the server.

A detailed description of the solution can be found on our project template

[iloveitaly]

This seems to change the names in the generated types:

export default defineConfig({
  output: {
    case: "camelCase",
  },
  client: "@hey-api/client-fetch",
})

But it does not actually translate the API response.