I am starting of with typescript and have hit a roadblock where I can't figure out why types are not being validated.
Route
app.use((req: Request, res: Response) => {
// here 404 is a string but should be a number according to type defined but no error is shown
return res.error({ status: '404', message: 'The API route does not exist' })
})
Middleware
interface APIResponse {
status: number,
message?: string | null,
data?: any
}
const responseHelper = (req: Request, res: Response, next: NextFunction) => {
res.showDefaultErrorPage = (status: number = 500) => {
//...
}
res.success = (options: APIResponse) => {
const {
status = 200,
message = null,
data
} = options
//...
}
res.error = (options: APIResponse) => {
const {
status = 500,
message = null
} = options
//...
}
next()
}
export default responseHelper
Custom type definition for express response
/* eslint-disable no-unused-vars */
declare namespace Express {
interface Response {
showDefaultErrorPage?: any
showErrorPage?: any
success?: any
error?: any
}
}
CodePudding user response:
You could change your type definiton to this:
declare namespace Express {
interface Response {
showDefaultErrorPage?: any
showErrorPage?: any
success?: (options: ApiResponse) => Response<any, Record<string, any>, number>
error?: (options: ApiResponse) => Response<any, Record<string, any>, number>
}
}