method TLSSocket.prototype.getEphemeralKeyInfo
Usage in Deno
```typescript import { TLSSocket } from "node:node__tls.d.ts"; ```
TLSSocket.prototype.getEphemeralKeyInfo():
Returns an object representing the type, name, and size of parameter of
an ephemeral key exchange in `perfect forward secrecy` on a client
connection. It returns an empty object when the key exchange is not
ephemeral. As this is only supported on a client socket; `null` is returned
if called on a server socket. The supported types are `'DH'` and `'ECDH'`. The `name` property is available only when type is `'ECDH'`.
For example: `{ type: 'ECDH', name: 'prime256v1', size: 256 }`.