What kind of change does this PR introduce?

🚧 WIP...

improve output for external module oflibrary.type: module

Before:

import*as__WEBPACK_EXTERNAL_MODULE_externalfrom'external'__WEBPACK_EXTERNAL_MODULE_external.foo;

This PR:

import{foo}from'external'foo;

ExternalModule is imported thoughInitFragment, which will insert a namespace import, but user may want to keep the code as is

// inputimport{foo}from'external'foo;// outputimport*as__WEBPACK_EXTERNAL_MODULE_externalfrom'external'__WEBPACK_EXTERNAL_MODULE_external.foo;

As we know theexportsInfo, we can use them to improve the output.

IfexportsInfo.getUsedExports() equals:

• true: used unknown exports from external module, fallback to namespace import like before
• Set<string>: we know exactly used exports from external module, render them, we should also insert the exported specifier intoConcatenationScope.allUsedNames to avoid conflicts

Did you add tests for your changes?

WIP...

Does this PR introduce a breaking change?

No

What needs to be documented once your changes are merged?