fix(ie compat): include polyfill for currentScript directly

[ameinhardt]

it would be nice if vue-cli produces libs, that can be used in IE directly.

[ameinhardt]

workaround to overwrite the existing file in vue.config.js:

config
      .plugin('fix-vue-cli-ie')
      .use(NormalModuleReplacementPlugin)
      .init(Plugin => new Plugin(/setPublicPath\.js/, __dirname + '/src/betterSetPublicPath.js'));

[haoqunjiang]

I'm not sure if it's a good idea to add this polyfill for every library build as it's only useful for those who need IE support.

When using Vue CLI to build a library or Web Components, it is recommended to pass useBuiltIns: false to @vue/babel-preset-app to disable automatic polyfill injection. This ensures you don't include unnecessary polyfills in your code, as it should be the responsibility of the consuming app to include polyfills.

I'd rather make it opt-in.

[yyx990803]

I think what we can do is:

• detect whether user intends to support IE by analyzing browserslist in package.json
• If need IE support, inject an env variable NEED_CURRENTSCRIPT_POLYFILL via webpack's define plugin and wrap the polyfill in a conditional block.
• This ensures the polyfill is dropped if user doesn't need IE support
• For the rare use case where user is producing multiple independent webpack bundles (thus duplicating the polyfill a lot), they can manually set NEED_CURRENTSCRIPT_POLYFILL to false in .env files and manage the polyfill themselves.

[haoqunjiang]

Closed in favor of #3760