Plugins: @rollup/plugin-babel: babelHelpers option error

[dangreen]

• Rollup Plugin Name: @rollup/plugin-babel
• Rollup Plugin Version: 5.0.0
• Rollup Version: 1.13.0
• Operating System (or Browser): macOS
• Node Version: v11.15.0

How Do We Reproduce?

https://github.com/canvg/canvg/pull/1046#discussion_r423445163

Expected Behavior

Lookup @babel/plugin-transform-runtime over babelrc and presets.

Actual Behavior

With babelHelpers: 'runtime' @rollup/plugin-babel lookup @babel/plugin-transform-runtime only in plugin options, but plugin-transform-runtime is included in preset (or in babelrc).

src/index.ts → lib/index.js, lib/index.es.js...
[!] (plugin babel) Error: You must use the `@babel/plugin-transform-runtime` plugin when `babelHelpers` is "runtime".

node_modules/regenerator-runtime/runtime.js
Error: You must use the `@babel/plugin-transform-runtime` plugin when `babelHelpers` is "runtime".

    at error (/Users/dangreen/github/canvg/node_modules/rollup/dist/shared/node-entry.js:5400:30)
    at throwPluginError (/Users/dangreen/github/canvg/node_modules/rollup/dist/shared/node-entry.js:11878:12)
    at Object.error (/Users/dangreen/github/canvg/node_modules/rollup/dist/shared/node-entry.js:12912:24)
    at Object.error (/Users/dangreen/github/canvg/node_modules/rollup/dist/shared/node-entry.js:12081:38)
    at preflightCheck (/Users/dangreen/github/canvg/node_modules/@rollup/plugin-babel/dist/index.js:188:11)

error Command failed with exit code 1.

[lijialiang]

I encountered the same problem

rollup.config.js

import babel, { getBabelOutputPlugin } from '@rollup/plugin-babel'

export default {
  input: './index.js',
  output: {
    format: 'umd',
    dir: 'dist'
  },
  plugins: [
    getBabelOutputPlugin({
      configFile: path.resolve(__dirname, '.babelrc'),
      allowAllFormats: true
    }),
    babel({
      babelHelpers: 'runtime'
    })
  ]
}

.babelrc

{
  "presets": [
    "@babel/preset-env"
  ],
  "plugins": [
    [
      "@babel/plugin-proposal-class-properties",
      { "loose": true }
    ],
    [
      "@babel/plugin-transform-runtime",
      { "corejs": 2 }
    ]
  ]
}

./index.js → dist...
[!] (plugin babel) Error: You must use the `@babel/plugin-transform-runtime` plugin when `babelHelpers` is "runtime".

node_modules/@babel/runtime-corejs2/core-js/promise.js

[lijialiang]

I found a configuration method to avoid this error

babel({
    babelHelpers: 'runtime',
    skipPreflightCheck: true
})

but how do you compile the dependencies of babel runtime to a file? :(

[shellscape]

@dangreen A link to a PR is not a proper reproduction.

Citing the issue template:

Issues without minimal reproductions will be closed! Please provide one by:

1. Using the REPL.it plugin reproduction template at https://repl.it/@rollup/rollup-plugin-repro
2. Provide a minimal repository link (Read https://git.io/fNzHA for instructions).
   These may take more time to triage than the other options.
3. Using the REPL at https://rollupjs.org/repl/

Please add a reproduction and we'll be happy to triage further. Given there's a workaround already posted, we'll leave this open, but the rollup team won't triage this until a proper repro is added.

[dangreen]

@shellscape https://repl.it/repls/IckyBrightCache

[IanMitchell]

Ran into this too while updating dependencies. Happy to push the WIP branch if it helps

[anthonator]

@shellscape looks like @dangreen provided a reproduction. Does that suffice? Is there anything else you need from us?

[shellscape]

A PR would be amazing. I'm not the sole contributor here and I haven't worked on the Babel plugin.

[stale[bot]]

Hey folks. This issue hasn't received any traction for 60 days, so we're going to close this for housekeeping. If this is still an ongoing issue, please do consider contributing a Pull Request to resolve it. Further discussion is always welcome even with the issue closed. If anything actionable is posted in the comments, we'll consider reopening it. ⓘ

[chovy]

I'm still getting this.