regenerator-runtime error message when bundling for older web browsers

[moritzlaube]

When trying to bundle my webpage with parceljs and the browserslist config set to "defaults" I get the following error:
@parcel/core: Failed to resolve 'regenerator-runtime' from './node\\_modules/@parcel/transformer-js/lib/JSTransformer.js'

When setting the browserslist config to "since 2017-06". Everything works fine. Does it has to do with Babel? Installing the regenerator-runtime with npm install regenerator-runtime silences this message. But in my case, GSAP (also installed via npm) stops working then. Does anyone have an idea why that happens? Appreciate your help.

(I am using 2.0.0-nightly.665by the way...)

[mischnic]

Installing the regenerator-runtime with npm install regenerator-runtime silences this message.

I would have suggested that as a workaround, but #6326 should actually fix this

[moritzlaube]

Thanks! How it worked for me:

• installing @babel/preset-env as a dev-dependency
• installing regenerator(not regenerator-runtime as it has a smaller footprint)
• in package.json adding "browserslist": ["defaults"]
• adding a .babelrcfile with the following content:

{
  "presets": [
      ["@babel/env"]
  ]
}