rollup-plugin-tree-shakeable

A Rollup plugin (v2.0.0, latest) that automatically adds @__PURE__ annotations to top-level expressions in your JavaScript/TypeScript modules, convincing bundlers like Rollup, esbuild, and webpack that the module is side-effect free and enabling effective tree-shaking. Unlike setting `sideEffects: false` in package.json, which cannot handle function calls at module scope, this plugin annotates each call individually. Requires Node >= 22 and Rollup. Lightweight, zero-config, and actively maintained with few dependencies.