【@vitejs/plugin-legacy】type="module" 对于file协议引入资源会有跨域问题

[kidjayhuang]

Description

某些场景，例如 app 本地h5包，会直接用file协议打开html入口。然后安卓低端机，目前测试结果是 android <=11，会因为跨域问题加载不出脚本，也不会被@vitejs/plugin-legacy 捕捉错误去加载 legacy脚本。建议是加上 type="module"导致的跨域判断[doge]

Suggested solution

我自己fork下来，将__vite_is_modern_browser暂时写死为false，
const detectModernBrowserCode = ${detectModernBrowserDetector}window.${detectModernBrowserVarName}=false;`
建议跟判断是否支持esm一样，判断跨域错误的场景才去加载 legacy 咯

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[bluwy]

If you mean that you're trying to use plugin-legacy with the file protocol, there's a PR to support it: #2574, but it's quite outdated.

[ZHUIMEN]

How to solve this problem in the end also bothers me.