fix: handle absolute path dest correctly (#249)

Author: sapphi-red

.changeset/eighty-mammals-search.md

@@ -0,0 +1,14 @@
+---
+'vite-plugin-static-copy': patch
+---
+
+Fix absolute `dest` paths being nested under the output directory
+
+When `dest` was an absolute path and the source file had a directory component (structured output), the path was incorrectly converted to a relative path, causing files to be nested under the build output directory instead of being copied to the specified absolute path.
+
+```js
+{ src: 'foo/foo.txt', dest: '/home/user/my-repo/bar' }
+```
+
+**Before**: `/home/user/my-repo/dist/home/user/my-repo/bar/foo/foo.txt`
+**After**: `/home/user/my-repo/bar/foo/foo.txt`

src/utils.ts

@@ -249,8 +249,7 @@ export const collectCopyTargets = async (
       if (!dir) {
         destDir = dest
       } else {
-        const destClean = `${dest}/${dirClean}`.replace(/^\/+|\/+$/g, '')
-        destDir = destClean
+        destDir = path.join(dest, dirClean)
       }
 
       copyTargets.push({

test/fixtures/vite.config.ts

@@ -151,6 +151,14 @@ export default defineConfig({
           src: 'foo.txt',
           dest: path.resolve(_dirname, 'dist/fixture13'),
         },
+        {
+          src: 'dir/bar.txt',
+          dest: path.resolve(_dirname, 'dist/fixture13-structured'),
+        },
+        {
+          src: normalizePath(path.resolve(_dirname, 'dir/*.txt')),
+          dest: 'fixture13-absolute-src',
+        },
         {
           src: 'foo.txt',
           dest: 'fixture14/sub',

test/testcases.ts

@@ -157,6 +157,16 @@ export const testcases: Record<string, Testcase[]> = {
       src: './foo.txt',
       dest: '/fixture13/foo.txt',
     },
+    {
+      name: 'absolute path dest with structured dir',
+      src: './dir/bar.txt',
+      dest: '/fixture13-structured/dir/bar.txt',
+    },
+    {
+      name: 'absolute src and absolute dest',
+      src: './dir/bar.txt',
+      dest: '/fixture13-absolute-src/dir/bar.txt',
+    },
     {
       name: 'rename with ../ (non-structured)',
       src: './foo.txt',