# What changed in esbuild-loader

> 2 changes in esbuild-loader 4 from its official release notes, upgrade guides and advisories: 1 deprecations. Each one cited. Sources checked 2026-10-18. HTML: https://unstale.sh/npm/esbuild-loader/

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

## esbuild-loader 4

### Deprecations

- Warns when define is used with eval-based devtools. (4.4.2) — [release notes](https://github.com/privatenumber/esbuild-loader/releases/tag/v4.4.2)

### Tooling

- esbuild-loader now supports esbuild 0.28. (4.5.0) — [release notes](https://github.com/privatenumber/esbuild-loader/releases/tag/v4.5.0)