Error with 'import' statement without .js extension using npm module with Laravel Mix

Question

I'm using CKEditor 5 in a Laravel project, getting it from a CDN, so initially I have not needed to run npm. But now I need an alignment plugin, so I used Laravel Mix to run npm install, and then copy the plugin to public folder. Like this:

mix.copyDirectory('node_modules/@ckeditor', 'public/@ckeditor');

In my code, I tried to import it:

import Alignment from '/@ckeditor/ckeditor5-alignment/src/alignment.js';

So it threw this error in console

Uncaught TypeError: Failed to resolve module specifier "@ckeditor/ckeditor5-core/src/plugin". Relative references must start with either "/", "./", or "../".

I solved it by auto replacing all @ckeditor/ckeditor5-core/src references in the plugin with /@ckeditor/ckeditor5-core/src

But now, it's throwing these import errors, and it's because of the lack of .js extension inside the plugin codes when importing

alignment.js:10 GET http://localhost:8000/@ckeditor/ckeditor5-core/src/plugin net::ERR_ABORTED 404 (Not Found)

alignment.js:12 GET http://localhost:8000/@ckeditor/ckeditor5-alignment/src/alignmentediting net::ERR_ABORTED 404 (Not Found)

alignment.js:13 GET http://localhost:8000/@ckeditor/ckeditor5-alignment/src/alignmentui net::ERR_ABORTED 404 (Not Found)

我的问题是是否有一些工具可以在这些 import 语句的末尾添加扩展，或者是否有一种更简单的方法可以在不运行 Node.js 的情况下使用此 npm 模块，因为我是npm的菜鸟。