Type checking error for generate function

[WangHansen]

Describe the bug

TypeScript error: Argument of type '"string"' is not assignable to parameter of type '"oct"'

To Reproduce

Steps to reproduce the behaviour:

1. create a keystore with new jose.JWT.KeyStore()
2. create a type alias type Algorithm = "RSA" | "EC" | "OKP" | "oct";
3. create a function generateKey:

function generateKey(alg: Algorithm) {
  return keystore.generateSync(alg, "P-256");
}

Reproduction link: https://codesandbox.io/s/laughing-shockley-hlpr1?file=/src/index.ts

Expected behaviour
Expect no error with type checking

Environment:

• jose version: v1.26.0
• node version: v12.13.1

Additional context
Add any other context about the problem here.

• the bug is happening on latest jose too.
• i have searched the issues tracker on github for similar issues and couldn't find anything related.

[panva]

@WangHansen please see the fix-80 branch and let me know if it resolves the issue.

[WangHansen]

@panva Sorry for the late reply, it works now, thank you for the fast fix. It apparently has something to do with TypeScript itself as well, see this. But with your fix, it should work now, thanks again!