chore: use win32 ebusy workaround on middleware-pages fixture (#328)

* chore: use win32 ebusy workaround on middleware-pages fixture

* chore: ignore workflows

---------

Co-authored-by: Matt Kane <[email protected]>
Co-authored-by: Matt Kane <[email protected]>

Author: pieh

.prettierignore

@@ -9,4 +9,6 @@ edge-runtime/vendor/
 deno.lock
 tests/fixtures/simple-next-app-dist-dir/cool/output
 .nx
-custom-dist-dir
+custom-dist-dir
+# to avoid needing extra permissions to format files
+.github/workflows

tests/fixtures/middleware-pages/next.config.js

@@ -1,3 +1,26 @@
+const { platform } = require('process')
+const fsPromises = require('fs/promises')
+
+// Next.js uses `fs.promises.copyFile` to copy files from `.next`to the `.next/standalone` directory
+// It tries copying the same file twice in parallel. Unix is fine with that, but Windows fails
+// with "Resource busy or locked", failing the build.
+// We work around this by memoizing the copy operation, so that the second copy is a no-op.
+// Tracked in TODO: report to Next.js folks
+if (platform === 'win32') {
+  const copies = new Map()
+
+  const originalCopy = fsPromises.copyFile
+  fsPromises.copyFile = (src, dest, mode) => {
+    const key = `${dest}:${src}`
+    const existingCopy = copies.get(key)
+    if (existingCopy) return existingCopy
+
+    const copy = originalCopy(src, dest, mode)
+    copies.set(key, copy)
+    return copy
+  }
+}
+
 module.exports = {
   trailingSlash: true,
   output: 'standalone',

tests/fixtures/wasm/next.config.js

@@ -1,7 +1,7 @@
 const { platform } = require('process')
 const fsPromises = require('fs/promises')
 
-// Next.js uses `fs.promises.copyFile` to copy the `.wasm` file to the `.next` directory
+// Next.js uses `fs.promises.copyFile` to copy files from `.next`to the `.next/standalone` directory
 // It tries copying the same file twice in parallel. Unix is fine with that, but Windows fails
 // with "Resource busy or locked", failing the build.
 // We work around this by memoizing the copy operation, so that the second copy is a no-op.