bug: Generate OKPKeys: TypeError [ERR_INVALID_ARG_TYPE]

[kareha]

Describe the bug
When I want to create OKP Keys I get an error:

TypeError [ERR_INVALID_ARG_TYPE]: The "options" argument must be of type object. Received type undefined
    at check (internal/crypto/keygen.js:163:11)
    at generateKeyPair (internal/crypto/keygen.js:33:16)
    at Promise (internal/util.js:274:30)
    at new Promise (<anonymous>)
    at generateKeyPair (internal/util.js:273:12)

To Reproduce

Code to reproduce:

const fs = require('fs')
const path = require('path')
const jose = require('jose')

const keystore = new jose.JWKS.KeyStore()

Promise.all([
  // ...
  keystore.generate('OKP', 'Ed25519', { use: 'sig' })
]).then(() => {
  fs.writeFileSync(path.resolve(__dirname, './keystore.json'), JSON.stringify(keystore.toJWKS(true), null, 2))
})
.then(() => console.log('Generate complete.'))
.catch(console.error)

Expected behaviour
No error

Environment:

• jose version: latest
• node version: latest

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]

OKP is not supported under node 10 which you're clearly running (as opposed to 'latest' you wrote). I'll make sure the error is a bit nicer.