fix(migrations): account for members with doc strings and no modifiers (#57389)

Fixes that the migration was duplicating the doc strings of members that don't have modifiers.

PR Close #57389

packages/core/schematics/ng-generate/inject-migration/migration.ts

@@ -95,7 +95,7 @@ export function migrateFile(sourceFile: ts.SourceFile, options: MigrationOptions
 
           const newProperty = ts.factory.createPropertyDeclaration(
             cloneModifiers(property.modifiers),
-            property.name,
+            cloneName(property.name),
             property.questionToken,
             property.type,
             initializer,
@@ -626,3 +626,26 @@ function cloneModifiers(modifiers: ts.ModifierLike[] | ts.NodeArray<ts.ModifierL
       : ts.factory.createModifier(modifier.kind);
   });
 }
+
+/**
+ * Clones the name of a property. Can be useful to strip away
+ * the comments of a property without modifiers.
+ */
+function cloneName(node: ts.PropertyName): ts.PropertyName {
+  switch (node.kind) {
+    case ts.SyntaxKind.Identifier:
+      return ts.factory.createIdentifier(node.text);
+    case ts.SyntaxKind.StringLiteral:
+      return ts.factory.createStringLiteral(node.text, node.getText()[0] === `'`);
+    case ts.SyntaxKind.NoSubstitutionTemplateLiteral:
+      return ts.factory.createNoSubstitutionTemplateLiteral(node.text, node.rawText);
+    case ts.SyntaxKind.NumericLiteral:
+      return ts.factory.createNumericLiteral(node.text);
+    case ts.SyntaxKind.ComputedPropertyName:
+      return ts.factory.createComputedPropertyName(node.expression);
+    case ts.SyntaxKind.PrivateIdentifier:
+      return ts.factory.createPrivateIdentifier(node.text);
+    default:
+      return node;
+  }
+}

packages/core/schematics/test/inject_migration_spec.ts

@@ -1784,10 +1784,14 @@ describe('inject migration', () => {
           `@Directive()`,
           `class MyDir {`,
           `  /** Value of Foo */`,
-          `  private value: number;`,
+          `  private readonly value: number;`,
+          ``,
+          `  /** ID of Foo */`,
+          `  id: string;`,
           ``,
           `  constructor(private foo: Foo) {`,
           `    this.value = this.foo.getValue();`,
+          `    this.id = this.foo.getId();`,
           `  }`,
           `}`,
         ].join('\n'),
@@ -1804,7 +1808,10 @@ describe('inject migration', () => {
         `  private foo = inject(Foo);`,
         ``,
         `  /** Value of Foo */`,
-        `  private value: number = this.foo.getValue();`,
+        `  private readonly value: number = this.foo.getValue();`,
+        ``,
+        `  /** ID of Foo */`,
+        `  id: string = this.foo.getId();`,
         `}`,
       ]);
     });