Renaming tags doesn't propagate to Action.match keys

[OliverJAsh]

I think this can be boiled down to a TypeScript issue. In the following example, foo is not renamed within match, but it should be:

{
  type MyActions = { foo: {}; bar: {} };
  type Cases = Record<keyof MyActions, {}>;
  const match = (cases: Cases) => {}

  match({
    foo: 1,
    bar: 2,
  })
}

If Record is replaced with mapped types, renaming does work:

{
  type MyActions = { foo: {}; bar: {} };
  type Cases = { [key in keyof MyActions]: {} };
  const match = (cases: Cases) => {}

  match({
    foo: 1,
    bar: 2,
  })
}

I opened an issue on TypeScript to track this microsoft/TypeScript#20272.

Filing here in case other people find the same problem when using unionize!

(And thanks for the fantastic library.)

[OliverJAsh]

This no longer appears to be an issue. Did we stop using Record in place of mapped types somewhere along the line?

[pelotom]

Nothing has changed in the basic approach, my guess is the TS language service just got a little smarter at some point 🙂