[6.2.0-rc.2] problem with resolving imports in development mode

[idbartosz]

Describe the bug

In Storybook 6.2.0 development mode there's a problem with import resolving. This problem only occurs in the development mode the builded version works fine.

To Reproduce

1. Bootstrap an example project with npx -p @storybook/cli@next sb init --type react
2. Install some packages which support different modules like CJS and ESM
3. In development mode try to import and use that package

• when imported in standard way import ReactMapboxGl, { Layer, Feature } from "react-mapbox-gl" package doesn't work correctly in Storybook
• when specifying the import path directly to ESM it works ok import ReactMapboxGl, { Layer, Feature } from "react-mapbox-gl/lib-esm"

Expected behavior

Imports in development mode should work as they were in Storybook 6.1

Screenshots

Screen.Recording.2021-03-18.at.10.27.49.mov

System

  System:
    OS: macOS 11.2.3
    CPU: (8) x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
  Binaries:
    Node: 14.16.0 - ~/.nvm/versions/node/v14.16.0/bin/node
    Yarn: 1.22.10 - ~/.nvm/versions/node/v14.16.0/bin/yarn
    npm: 6.14.11 - ~/.nvm/versions/node/v14.16.0/bin/npm
  Browsers:
    Chrome: 89.0.4389.90
    Firefox: 86.0.1
    Safari: 14.0.3
  npmPackages:
    @storybook/addon-actions: ^6.2.0-rc.2 => 6.2.0-rc.2 
    @storybook/addon-essentials: ^6.2.0-rc.2 => 6.2.0-rc.2 
    @storybook/addon-links: ^6.2.0-rc.2 => 6.2.0-rc.2 
    @storybook/react: ^6.2.0-rc.2 => 6.2.0-rc.2 

┆Issue is synchronized with this Asana task by Unito

[shilman]

Do you have a repro repo you can share?

[idbartosz]

@shilman I see there's already a PR with fix, do you still need a reproduction repo?

[shilman]

@idbartosz no, i think we figured out the problem and can hopefully get you the fix soon

[shilman]

Gadzooks!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.2.0-rc.4 containing PR #14271 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.