fix(loader): restore legacy slash-prefixed class resolution for container:graph

lib/Loader/FileLoader.js

@@ -313,12 +313,18 @@ class FileLoader {
    * @private
    */
   async _requireClassNameFromPath (classObject, mainClassName) {
-    const fromDirectory = this._getFromDirectoryByClassObject(classObject)
-    const exportedModule = await this._getExportedModule(fromDirectory, classObject)
+    // Normalize legacy slash-prefixed single-segment class references (e.g. '/Kernel' → 'Kernel').
+    // These are distinguished from real absolute paths by having only one path segment after '/'.
+    const normalizedClass = (classObject && classObject.startsWith('/') && classObject.lastIndexOf('/') === 0)
+      ? classObject.slice(1)
+      : classObject
+
+    const fromDirectory = this._getFromDirectoryByClassObject(normalizedClass)
+    const exportedModule = await this._getExportedModule(fromDirectory, normalizedClass)
 
     const mainClass = exportedModule[mainClassName]
     const defaultClass = exportedModule.default
-    const fileNameClass = exportedModule[path.basename(classObject)]
+    const fileNameClass = exportedModule[path.basename(normalizedClass)]
     return mainClass || defaultClass || fileNameClass || exportedModule
   }
 

test/Resources/config/Kernel.js

@@ -0,0 +1,3 @@
+class Kernel {}
+
+export default Kernel

test/Resources/config/slash-prefixed-class.yml

@@ -0,0 +1,4 @@
+services:
+    kernel:
+        class: /Kernel
+        arguments: []

test/node-dependency-injection/lib/Loader/YamlFileLoader.spec.js

@@ -246,6 +246,20 @@ describe('YamlFileLoader', () => {
       return assert.instanceOf(syntheticService, SyntheticService)
     })
 
+    it('should load a service with a legacy slash-prefixed class reference', async () => {
+      // Arrange.
+      const serviceName = 'kernel'
+
+      // Act.
+      await loader.load(
+        path.join(__dirname, '/../../../Resources/config/slash-prefixed-class.yml'))
+      await container.compile()
+      const actual = container.get(serviceName)
+
+      // Assert.
+      return assert.isObject(actual)
+    })
+
     it('should load properly service without default export', async () => {
       // Arrange.
       const serviceName = 'named'