Note: The underlying issue was asked separately. This is a follow-up to a provided solution.
Typescript allows to create an Omit type since 2.8 via Exclude.
I want to use Omit in on an older codebase using typescript@2.3.
On this blog an implementation is shown which is:
type Diff<T extends string, U extends string> = ({[P in T]: P } & {[P in U]: never } & { [x: string]: never })[T];
type Omit<T, K extends keyof T> = Pick<T, Diff<keyof T, K>>;
Yet this one behaves weirdly for me, as:
inteface MyTarget {
a: string;
b: string;
c: string;
}
type MyPartial = Omit<MyTarget, "a" | "b">;
const foo: MyPartial = {
c: "foo",
};
will complain that my foo is lacking properties:
src/helper/types/Omit.ts(12,7): error TS2322: Type '{ c: string; }' is not assignable to type 'Pick<MyTarget, "a" | "b" | "c">'.
Property 'a' is missing in type '{ c: string; }'.
Yet the whole idea is to generate a type that lacks certain fields.
How do I create a proper Omit type in TypeScript without upgrading to a more current typescript version?
