Feature: ability to unset/change built-in defines

[pc-erin]

There's an issue with some libraries that, instead of using process.env.NODE_ENV they use globalThis.process.env.NODE_ENV, and, and the default define behavior (not sure if it's this plugin or SWC) results in code like globalThis."development" === "development".

See: graphql/graphql-js#3928

I've tried to override this behavior using vite's define config option, but it doesn't seem to work.

[ArnaudBarre]

This is working at least when in source code in dev. Probably a mismatch from Vite at build time or optimize deps time. Please open an issue with a small repro on stackblitz on the Vite core repo