fix(core): hide node:async_hooks import from non-Qwik bundlers#8602
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maiieul merged 3 commits intoMay 4, 2026
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use-locale.ts does import('node:async_hooks') inside an if (isServer)
branch to set up AsyncLocalStorage. Consumers that bundle @qwik.dev/core
for the browser without the Qwik Vite plugin (e.g. Cypress's
webpack-preprocessor) can't tree-shake the dead branch and fail at build
time with UnhandledSchemeError.
Build the dynamic-import target at runtime so the literal isn't
preserved through Rollup's constant folding, and add /* webpackIgnore */
+ /* @vite-ignore */ comments to cover consumer bundlers.
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What is it?
Description
`packages/qwik/src/core/use/use-locale.ts` does `import('node:async_hooks')` inside an `if (isServer)` branch (added in #9116 — `bdc690ddf` feat(core): use AsyncLocalStorage for locale) to set up `AsyncLocalStorage` server-side.
The `isServer` flag is a runtime check (`!isBrowser` from `@qwik.dev/core/build`), not a bundler define. Consumers bundling `@qwik.dev/core` for the browser without the Qwik Vite plugin can't tree-shake this branch and fail at build time:
```
Module build failed: UnhandledSchemeError: Reading from "node:async_hooks" is not handled by plugins (Unhandled scheme).
```
I hit this with Cypress's default webpack-preprocessor in a Qwik 2 monorepo migration. Any spec file whose import graph touches `@qwik.dev/core` blows up. Same class of issue would hit raw webpack/esbuild/Parcel setups that don't run the Qwik optimizer.
Fix