feat: scanDirs respects input dirs order

playground/composables-override/foo.ts

@@ -0,0 +1,3 @@
+export default function () {
+  return 'bar'
+}

src/scan-dirs.ts

@@ -10,28 +10,29 @@ export async function scanDirExports (dir: string | string[], options?: ScanDirE
 
   const fileFilter = options?.fileFilter || (() => true)
   const filePatterns = options?.filePatterns || ['*.{ts,js,mjs,cjs,mts,cts}']
-  const files = await fg(
-    dirs.flatMap(i => [
-      i,
-      ...filePatterns.map(p => join(i, p))
-    ]),
-    {
-      absolute: true,
-      cwd: options?.cwd || process.cwd(),
-      onlyFiles: true,
-      followSymbolicLinks: true
-    }
-  ).then(r => r.map(f => normalize(f)).sort().filter(fileFilter))
-
-  const imports: Import[] = []
 
-  await Promise.all(
-    files.map(async (path) => {
-      imports.push(...await scanExports(path))
-    })
+  const result = await Promise.all(
+    // Do multiple glob searches to persist the order of input dirs
+    dirs.map(async i => await fg(
+      [i, ...filePatterns].map(p => join(i, p)),
+      {
+        absolute: true,
+        cwd: options?.cwd || process.cwd(),
+        onlyFiles: true,
+        followSymbolicLinks: true
+      })
+      .then(r => r
+        .map(f => normalize(f))
+        .filter(fileFilter)
+        .sort()
+      )
+    )
   )
 
-  return imports
+  const files = Array.from(new Set(result.flat())).filter(fileFilter)
+  const fileExports = await Promise.all(files.map(scanExports))
+
+  return fileExports.flat()
 }
 
 export async function scanExports (filepath: string) {

test/scan-dirs.test.ts

@@ -61,4 +61,23 @@ describe('scan-dirs', () => {
     )
       .toContain('nested/index.ts')
   })
+
+  test('scanDirs should respect dirs order', async () => {
+    const firstFolder = join(__dirname, '../playground/composables')
+    const secondFolder = join(__dirname, '../playground/composables-override')
+    const options = {
+      filePatterns: [
+        '*.{ts,js,mjs,cjs,mts,cts}',
+        '*/index.{ts,js,mjs,cjs,mts,cts}'
+      ]
+    }
+
+    const [result1, result2] = await Promise.all([
+      scanDirExports([firstFolder, secondFolder], options),
+      scanDirExports([secondFolder, firstFolder], options)
+    ])
+
+    expect(result1.at(-1)?.from).toBe(join(secondFolder, 'foo.ts'))
+    expect(result2.at(0)?.from).toBe(join(secondFolder, 'foo.ts'))
+  })
 })