fix: enum name extraction after typescript build

src/decorators/is-enum.spec.ts

@@ -67,6 +67,25 @@ describe('IsEnum', () => {
       enumField!: Enum;
     }
 
+    it('works with enums after TypeScript build', async () => {
+      // Emulate Enum name after TS build - module_1.TestEnum
+      const module_1 = {
+        Enum
+      }
+
+      class TestDto {
+        @IsEnum({ enum: () => module_1.Enum })
+        enumField!: Enum;
+      }
+
+      expect(await input(TestDto, { enumField: 'On' })).toStrictEqual(
+        Result.ok(make(TestDto, { enumField: Enum.On }))
+      );
+      expect(await input(TestDto, { enumField: 'Off' })).toStrictEqual(
+        Result.ok(make(TestDto, { enumField: Enum.Off }))
+      );
+    })
+
     it('generates correct schema', async () => {
       expect(await generateSchemas([Test])).toStrictEqual({
         Enum: {

src/decorators/is-enum.ts

@@ -58,11 +58,16 @@ function getEnumNameAndValues<T extends number | string>(
 }
 
 function getEnumNameFromFunction(e: () => unknown) {
-  const enumName = e.toString().split('=>')[1].trim();
+  const fullEnumName = e.toString().split('=>')[1].trim();
 
-  if (!/^\w+$/.test(enumName)) {
-    throw new Error(`Invalid enum name: ${enumName}`);
+  // after TS build to commonjs modules enums are
+  // replaced with {module-name}.{enum}, example gender_1.Gender
+  // So need to extract actuall enumName
+  const match = fullEnumName.match(/^(\w+\.)?(?<name>\w+)$/);
+
+  if (!match) {
+    throw new Error(`Invalid enum name: ${fullEnumName}`);
   }
 
-  return enumName;
+  return match.groups?.name;
 }