web extension dynamic entry point

[sergey-shpak]

Hi guys,
I'm working on web extension and we are planning to support new browsers soon, but there are differences between manifest file properties for different browsers and versions which cannot be combined into single manifest file(like for example minimum_chrome_version and minimum_opera_version etc). So it would be awesome if there would be possibility to set different entry points for web extension, for example:

"bundle:chrome": "parcel build src/chrome.manifest.json --dist-dir ./chrome  --no-cache",
"bundle:firefox": "parcel build src/firefox.manifest.json --dist-dir ./firefox  --no-cache",

[mischnic]

This is already almost possible, see parcel-bundler/website#1052 (comment)

Would be great if someone could fix that last bit