Support structuredClone

[SimenB]

Ships in Node 17

https://nodejs.org/api/globals.html#structuredclonevalue-options
https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

it is also used by e.g. worker_threads, which ships from node 10

const envalid = require('envalid');

const config = envalid.cleanEnv({ HELLO: 'foobar' }, { HELLO: envalid.str() });

structuredClone(config);

throws

Uncaught:
DOMException [DataCloneError]: #<Object> could not be cloned.
    at structuredClone (node:internal/structured_clone:15:17)

[af]

Good idea, I hadn't seen this API yet. Any idea how to opt into it? I'm guessing it's the proxy middleware that's problematic here

[SimenB]

I don't know if it's possible actually. Seems to be undiscoverable by spec: https://bugzilla.mozilla.org/show_bug.cgi?id=1269327

Should at least add a note in the readme to warn users

[af]

Added a Readme note in a new faq section: https://github.com/af/envalid#faq