Line endings are silly... what a world

Author: calebeby

src/module-server/middleware/js.ts

@@ -1,5 +1,4 @@
 import { promises as fs } from 'node:fs';
-import { EOL } from 'node:os';
 import { dirname, isAbsolute, posix, relative, resolve, sep } from 'node:path';
 
 import type { DecodedSourceMap, RawSourceMap } from '@ampproject/remapping';
@@ -103,6 +102,13 @@ export const jsMiddleware = async ({
           import.meta.pleasantestArgs = [...window._pleasantestArgs]
         }`;
         const fileSrc = await fs.readFile(file, 'utf8');
+        let EOL = '\n';
+        // Find the first line end (\n) and check if the character before is \r
+        // This tells us whether the file uses \r\n or just \n for line endings.
+        // Using node:os.EOL is not sufficient because git on windows
+        // Can be configured to check out files with either kind of line ending.
+        const firstLineEndPos = fileSrc.indexOf('\n');
+        if (fileSrc[firstLineEndPos - 1] === '\r') EOL = '\r\n';
         const inlineStartIdx = fileSrc.indexOf(code.replaceAll('\n', EOL));
         code = injectedArgsCode + code;
         if (inlineStartIdx !== -1) {