Inferring OAS Schema Types
In feTS, you can use helpers to infer specific fragments of an OpenAPI document.
Models
To infer models from an OpenAPI document, use the OASModel type:
user-type.ts
import type { NormalizeOAS, OASModel } from 'fets'
import type oas from './openapi'
// This will infer User type from your OpenAPI schema
type User = OASModel<NormalizeOAS<typeof oas>, 'User'>Request Parameters
To infer request body parameters from an OpenAPI document, utilize the OASRequestBody type:
user-request-parameters.ts
import type { NormalizeOAS, OASRequestParameters } from 'fets'
import type oas from './openapi'
type AddUserInput = OASRequestParams<NormalizeOAS<typeof oas>, '/user', 'POST'>Response body
Use the OASOutput type, to infer the response body from an OpenAPI document:
user-response-body.ts
import type { NormalizeOAS, OASOutput } from 'fets'
import type oas from './openapi'
type UserByIdResponse = OASOutput<NormalizeOAS<typeof oas>, '/user/:id', 'POST', 200>