Object-assign not found when transforming with babel

[mikemykhaylov]

I use my own boilerplate for react + typescript. Today when I tried to change the pipeline by adding @snowpack/plugin-babel, I've encountered this error:

[18:12:19] [snowpack] Server started in 13ms.
[18:12:19] [snowpack] Local: http://localhost:8080
[18:12:19] [snowpack] Network: http://192.168.20.189:8080
[18:12:21] [snowpack] Error: Package "object-assign" not found. Have you installed it? 
    at Object.resolveEntrypoint (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:43664:15)
    at Object.resolvePackageImport (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:54611:34)
    at resolveImport (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:54528:31)
    at /Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:54531:43
    at /Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:48423:37
    at Array.map (<anonymous>)
    at transformEsmImports (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:48415:31)
    at async Object.load (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:54530:23)
    at async loadUrl (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:131396:32)
    at async handleRequest (/Users/mike/Projects/snowpack-react-boilerplate/.yarn/cache/snowpack-npm-3.2.2-c5baa84fbb-bbd80dc65a.zip/node_modules/snowpack/lib/index.js:131643:28)
[18:12:21] [snowpack] Error: Package "object-assign" not found. Have you installed it? 
[18:12:21] [snowpack] [500] /_snowpack/pkg/react.v17.0.2/common/index-f983e16b.js

This hasn't happened when I used the regular transform. Anyone encountered something similar? Here's the test repo, check babel-issue branch: https://github.com/mmykhaylov/snowpack-react-boilerplate