# What changed in @storybook/addon-webpack5-compiler-babel

> 2 changes in @storybook/addon-webpack5-compiler-babel 4 from its official release notes, upgrade guides and advisories: 2 breaking. Each one cited. Sources checked 2026-10-20. HTML: https://unstale.sh/npm/@storybook/addon-webpack5-compiler-babel/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## @storybook/addon-webpack5-compiler-babel 4

### Breaking changes

- The addon is now ESM-only, affecting how developers load it. (4.0.0) — [release notes](https://github.com/storybookjs/addon-webpack5-compiler-babel/releases/tag/v4.0.0)
- The addon was upgraded to Storybook 10. (4.0.0) — [release notes](https://github.com/storybookjs/addon-webpack5-compiler-babel/releases/tag/v4.0.0)