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Next Dynamic doesn't work as expected with swcTransform

vercel/next.js#60174·142385·JavaScript·640 天未动·2 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

### Link to the code that reproduces this issue https://github.com/milap1296/dynamic-import-issue ### To Reproduce 1. yarn install. 2. yarn dev. 3. Set `forceSwcTransforms: true` in next.config.js. 4. See that the dynamically loaded component is preloaded when swc transpilation is enabled. 5. It is not preloaded when `forceSwcTransforms: false` is set and works as expected with babel transpilation. ### Current vs. Expected behavior **Current Behavior** Click on the `Show Header` button and the chunk corresponding to `Hello` should only be rendered then. It works as **expected** when **forceSwcTransforms is false** but when **forceSwcTransforms is true**, it preloads the `Hello` even before we click the `Show Header` button. <img width="1728" alt="image" src="https://github.com/vercel/next.js/assets/19545730/aaa0e8dc-530c-4eb7-a502-ba2d031208e1"> The underlying issue here is with this particular code - ```dynamic(import('../components/Header')```, it works as expected with swc if I replace it with ```dynamic(() => import('../components/Header')```, but what should be the ideal behavior because there are many instances of such in my app. **Expected Behavior** Lazy Loading should work as expected when **forceSwcTransforms is true**. This also doesn't work when the babel.config.js file is not present and we don't have any experimental configuration as well. ### Verify canary release - [X] I verified that the issue exists in the latest Next.js canary release ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 23.0.0: Fri Sep 15 14:41:43 PDT 2023; root:xnu-10002.1.13~1/RELEASE_ARM64_T6000 Binaries: Node: 18.18.2 npm: 9.8.1 Yarn: 1.22.19 pnpm: N/A Relevant Packages: next: 14.0.4 eslint-config-next: 14.0.4 react: 18.2.0 react-dom: 18.2.0 typescript: N/A Next.js Config: { swcMinify: true, reactStrictMode: true } ``` ### Which area(s) are affected? (Select all that apply) SWC…
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