support `import.meta.dirname` and `import.meta.filename` about webpack HOT 2 OPEN

I want to say it is expected, __dirname !== "import.meta.url" (with /..), so that is why you don't query, __dirname === import.meta.dirname (node.js 21 and we will improve it soon, if you browserslist contains node 21)

Try this:

index.mjs

const x = import('./test.mjs?reload=123');

test.mjs

console.log(import.meta.url);
console.log(import.meta.dirname);

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/cc @vankop I think we need to start support import.meta.dirname and import.meta.filename, there are two improvements:

1. Use import.meta.dirname and import.meta.filename instead __webpack_fileURLToPath__(import.meta.url + "/..") if target/browserslist support it
2. Don't output undefined for import.meta.dirname and import.meta.filename, i.e. output them as is if they supported or replace on our shim with __webpack_fileURLToPath__(import.meta.url + "/..") (I think we need options here i.e. node.importMetaDirname and node.importMetaFilename)

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