1 files changed, 38 insertions, 0 deletions
diff --git a/packages/astro/src/vite-plugin-load-fallback/index.ts b/packages/astro/src/vite-plugin-load-fallback/index.ts
new file mode 100644
index 000000000..6a6af9142
--- /dev/null
+++ b/packages/astro/src/vite-plugin-load-fallback/index.ts
@@ -0,0 +1,38 @@
+import type * as vite from 'vite';
+import nodeFs from 'fs';
+
+type NodeFileSystemModule = typeof nodeFs;
+
+export interface LoadFallbackPluginParams {
+	fs?: NodeFileSystemModule;
+}
+
+export default function loadFallbackPlugin({ fs }: LoadFallbackPluginParams): vite.Plugin | false {
+	// Only add this plugin if a custom fs implementation is provided.
+	if(!fs || fs === nodeFs) {
+		return false;
+	}
+
+  return {
+    name: 'astro:load-fallback',
+	enforce: 'post',
+    async load(id) {
+      try {
+		// await is necessary for the catch
+        return await fs.promises.readFile(cleanUrl(id), 'utf-8')
+      } catch (e) {
+        try {
+			return await fs.promises.readFile(id, 'utf-8');
+		} catch(e2) {
+			// Let fall through to the next
+		}
+      }
+    }
+  }
+}
+
+const queryRE = /\?.*$/s;
+const hashRE = /#.*$/s;
+
+const cleanUrl = (url: string): string =>
+	url.replace(hashRE, '').replace(queryRE, '');