fix(core): prevent /*#__PURE__*/ annotation inside function declarations (#2585)

zernonia · claude · web-flow · commit d7349e7db110 · 2026-04-08T00:30:43.000+08:00
The pureAnnotationPlugin regex matched `createContext(` inside function declarations like `function createContext(...)`, inserting the annotation between the `function` keyword and the name. This caused Rollup/Vite to emit a warning about uninterpretable annotations. Added a negative lookbehind `(?<!function\s)` to skip function declarations, so only actual call sites get annotated. Fixes #2579 Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
diff --git a/packages/core/tsdown.config.ts b/packages/core/tsdown.config.ts
@@ -3,8 +3,9 @@ import { defineConfig } from 'tsdown'
 
 // Match `defineComponent(`, `createContext(`, `reactive(` at word boundaries,
 // skipping calls already preceded by a PURE annotation or prefixed with a
-// word character (e.g. _defineComponent).
-const PURE_PATTERN = /(?<=^|[^.\w$])(defineComponent|createContext|reactive)\s*\(/g
+// word character (e.g. _defineComponent), or preceded by `function` keyword
+// (function declarations should not be annotated).
+const PURE_PATTERN = /(?<!function\s)(?<=^|[^.\w$])(defineComponent|createContext|reactive)\s*\(/g
 const ALREADY_PURE = /\/\*\s*[#@]__PURE__\s*\*\/\s*$/
 const PATH_SEP = /[\\/]/g
 
