If you're working with our API, you'll likely need to create an Order. While the order model remains consistent across different endpoints, the required fields may vary:
For a POST request, only a few fields are required.
With a PATCH request, all fields become optional.
However, for a PUT request, all fields must be included.
I'm wondering if it's possible to streamline this process in TypeScript by using a single model and adding notes to specify which fields are required for each API call?
To achieve this, you can utilize mapped types in TS2.8 to make properties required or optional. Here's a generic example:
// Require<T, K> makes specified keys in object type T required
type Require<T, K extends keyof T = keyof T> = Pick<T, Exclude<keyof T, K>> &
Required<Pick<T, K>>
// Optionalize<T, K> makes specified keys in object type T optional
type Optionalize<T, K extends keyof T = keyof T> = Pick<T, Exclude<keyof T, K>> &
Partial<Pick<T, K>>
These mapped types complement each other using built-in functions like Pick, Partial, and custom conditional types. The idea is to separate properties with and without specified keys, modify accordingly, then reconstruct the type. You can test it as follows:
// Interface for testing
interface AnInterface {
req1: string;
readonly req2: number;
readonly opt1?: boolean;
opt2?: object;
}
// Test the Require mapping
type SomeRequired = Require<AnInterface, "req1" | "opt1">;
// type SomeRequired = { ... }
// Test the Optionalize mapping
type SomeOptional = Optionalize<AnInterface, "req1" | "opt1">;
// type SomeOptional = { ... }
Once tested successfully, you can apply these mappings to your specific object types and key names. Good luck!
Link to code
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