build support for React Fast Refresh (HMR)

[cliffordp]

Parcel got a mention from Dan Abramov at facebook/react#16604 (comment) where he details what it would take for bundlers (e.g. webpack or parcel) to implement Fast Refresh. GIF from Twitter: https://twitter.com/addyosmani/status/1251967793479606272

I thought it'd be swell to at least get the TODO logged here. Not sure if the maintainers would only consider this for Parcel 2, but I don't know P2's status or if it's continually being worked on or when it's expected to be released.

[mischnic]

I thought it'd be swell to at least get the TODO logged here

I don't know why Next.js's experimental implementation has sparked once again sparked interest in Fast Refresh on Twitter.

I have implemented this feature 5 months ago and it's part of Parcel 2 since then: #3654

if it's continually being worked

Yes

[cliffordp]

HaHaHa... dude, parcel is so cool. What's P2's status (alpha/beta)? Is it expected to be released in 2020?