feat: enable eol by default and generated formatted output when no entities are found in scan

Author: thetutlage

package.json

@@ -49,11 +49,11 @@
     "@japa/snapshot": "^2.0.9",
     "@poppinss/ts-exec": "^1.4.1",
     "@release-it/conventional-changelog": "^10.0.1",
-    "@types/node": "^24.5.2",
+    "@types/node": "^24.6.0",
     "@types/picomatch": "^4.0.2",
     "@types/pretty-hrtime": "^1.0.3",
     "c8": "^10.1.3",
-    "cross-env": "^10.0.0",
+    "cross-env": "^10.1.0",
     "del-cli": "^7.0.0",
     "eslint": "^9.36.0",
     "hot-hook": "^0.4.1-next.0",

src/index_generator/source.ts

@@ -79,7 +79,7 @@ export class IndexGeneratorSource {
    * content based on configuration, and writes it to disk.
    */
   #generateOutput = throttle(async () => {
-    const buffer = new FileBuffer()
+    const buffer = new FileBuffer().eol(true)
 
     if (this.#config.as === 'barrelFile') {
       this.#asBarrelFile(
@@ -237,6 +237,11 @@ export class IndexGeneratorSource {
         return `() => import('${importGenerator(filePath)}')`
       },
     })
+    const treeLength = Object.keys(tree).length
+    if (!treeLength) {
+      buffer.write(`export const ${exportName} = {}`)
+      return
+    }
 
     if (useEagerImports) {
       buffer.writeLine(importsBuffer)

tests/index_generator.spec.ts

@@ -258,7 +258,7 @@ test.group('Index generator', () => {
     `)
   })
 
-  test('create index from without lazy imports', async ({ assert, fs }) => {
+  test('create index without lazy imports', async ({ assert, fs }) => {
     const outputPath = '.adonisjs/backend/controllers.ts'
     const source = string.toUnixSlash(fs.basePath)
 
@@ -298,4 +298,25 @@ test.group('Index generator', () => {
       }"
     `)
   })
+
+  test('create index when there is nothing to output', async ({ assert, fs }) => {
+    const outputPath = '.adonisjs/backend/controllers.ts'
+    const source = string.toUnixSlash(fs.basePath)
+
+    const transformer = new IndexGenerator(source, ui.logger)
+    transformer.add('controllers', {
+      as: 'barrelFile',
+      disableLazyImports: true,
+      exportName: 'controllers',
+      output: outputPath,
+      source: 'app/controllers',
+      importAlias: '#controllers',
+    })
+    await transformer.generate()
+
+    assert.snapshot(await fs.contents(outputPath)).matchInline(`
+      "export const controllers = {}
+      "
+    `)
+  })
 })