Proper way to logging in plugins?

[berkant]

I'm writing a transformer plugin for Svelte, however trying to print the arguments using console.log doesn't seem to work. Am I missing something, or there is a better way to handle logging for debugging purposes?

[DeMoorJasper]

Yes, Parcel 2 no longer really supports console.log as we use our own internal logger as we need to ensure all messages are being printed by the main thread and because we also support more advanced formatting using diagnostics objects.

All functions in every plugin have a key in their parameter object called logger which has a similar api to console.
An example here:
https://github.com/parcel-bundler/parcel/blob/v2/packages/transformers/postcss/src/PostCSSTransformer.js#L20
https://github.com/parcel-bundler/parcel/blob/v2/packages/transformers/postcss/src/loadConfig.js#L81

And the logger itself can be found here https://github.com/parcel-bundler/parcel/blob/db7e3a12105630abc44058bff7a88eb612f12e75/packages/core/logger/src/Logger.js