diff --git a/src/rz/angular/angular-effect.spec.ts b/src/rz/angular/angular-effect.spec.ts
new file mode 100644
index 0000000..4bfc61d
--- /dev/null
+++ b/src/rz/angular/angular-effect.spec.ts
@@ -0,0 +1,13 @@
+import { NOT_SUPPORTED } from "../morph";
+import { angularFilesToAffect } from "./angular-effects";
+
+describe('AngularEffects', () => {
+  it('should return NOT_SUPPORTED if not supported', () => {
+    const filePath = 'libs/hello.ts';
+    const fileTree: string[] = [];
+    const type = 'zulu' as any;
+
+    const result = angularFilesToAffect(filePath, fileTree, type, []);
+    expect(result).toEqual(NOT_SUPPORTED)
+  })
+})
\ No newline at end of file
diff --git a/src/rz/angular/angular-effects.ts b/src/rz/angular/angular-effects.ts
index 3702555..5b3bd2f 100644
--- a/src/rz/angular/angular-effects.ts
+++ b/src/rz/angular/angular-effects.ts
@@ -1,5 +1,5 @@
 import { Parameters } from "../morph";
-import { EditFileEffect } from "../morph/interfaces/morph.interface";
+import { EditFileEffect, NOT_SUPPORTED, NOT_SUPPORTED_TYPE } from "../morph/interfaces/morph.interface";
 import { addClassToDeclarationsAndImports, componentEffects, fileToAddClassToDeclarationsAndImports } from "./effects/component/component-effects";
 import { exportDirectiveFile } from "./effects/directive/directive";
 import { exportGraphqlFile } from "./effects/graphql/graphql";
@@ -11,12 +11,12 @@ import { exportServiceFile } from "./effects/service/service";
 import { exportComponentFile } from "./effects/standalone-component/standalone-component";
 import { AngularType, AngularTypeNames, AngularOptionalType } from "./types/types";
 
-export function angularFilesToAffect(filePathWithName: string, fileTree: string[], type: AngularTypeNames, optionalTypes: AngularOptionalType[]): string[] {
+export function angularFilesToAffect(filePathWithName: string, fileTree: string[], type: AngularTypeNames, optionalTypes: AngularOptionalType[]): string[] | NOT_SUPPORTED_TYPE {
   switch(type) {
     case AngularTypeNames.Component:
       return fileToAddClassToDeclarationsAndImports(filePathWithName, fileTree, optionalTypes);
     default:
-      return [];
+      return NOT_SUPPORTED;
   }
 }
 
diff --git a/src/rz/morph/index.ts b/src/rz/morph/index.ts
index f984df0..a4ba1d6 100644
--- a/src/rz/morph/index.ts
+++ b/src/rz/morph/index.ts
@@ -1,3 +1,3 @@
 export { morphCode, filesToAffect, effects, standaloneEffects, Parameters, types } from "./morph";
-export { EditFile, EditInput} from "./interfaces/morph.interface";
+export { EditFile, EditInput, NOT_SUPPORTED_TYPE, NOT_SUPPORTED} from "./interfaces/morph.interface";
 export { communityPaths, supportedCommunityPaths } from "./community-paths/community-paths";
\ No newline at end of file
diff --git a/src/rz/morph/interfaces/morph.interface.ts b/src/rz/morph/interfaces/morph.interface.ts
index 268cd94..8368d36 100644
--- a/src/rz/morph/interfaces/morph.interface.ts
+++ b/src/rz/morph/interfaces/morph.interface.ts
@@ -7,6 +7,9 @@ export interface EditInput {
   edits: EditFile[];
 }
 
+export type NOT_SUPPORTED_TYPE = 'NOT_SUPPORTED';
+export const NOT_SUPPORTED = 'NOT_SUPPORTED';
+
 export interface EditFile { 
   nodeType?: 'import' | 'export' | 'classDeclaration' | 'classMethod' | 'addNgModuleImport' | 'addNgModuleImportToSpec' | 
   'addNgModuleProvider' | 'addNgModuleDeclaration' | 'addNgModuleProviderToSpec' | 'addToVariableObject' | 'editImport' | 'addConstructorMethod' | 
diff --git a/src/rz/morph/morph.spec.ts b/src/rz/morph/morph.spec.ts
index ff7abbe..223ac83 100644
--- a/src/rz/morph/morph.spec.ts
+++ b/src/rz/morph/morph.spec.ts
@@ -1,8 +1,8 @@
 import { EditScssInput } from './../scss/interfaces/morph-scss.interface';
 import { readFileSync, writeFileSync } from 'fs';
 import { EditHtmlFile, EditHtmlInput } from '../angular/interfaces/edit-html.interface';
-import { EditInput } from './interfaces/morph.interface';
-import { morphCode } from "./morph"; 
+import { EditInput, NOT_SUPPORTED } from './interfaces/morph.interface';
+import { filesToAffect, morphCode } from "./morph"; 
 
 describe('morph', () => {
   const siblingCodeBlock = `<mat-paginator *ngIf="isPageable"
@@ -106,6 +106,43 @@ describe('morph', () => {
     expect(morphCode(editScssInput as EditScssInput)).toEqual(expected);
   });
 
+  describe('NOT_SUPPORTED', () => {
+
+    it('should return NOT_SUPPORTED if not language supported', () => {
+      const mockFilePath = 'path/to/another/src/hello.component.ts';
+      const mockParameter = {
+        optionalTypes: {},
+        type: 'component' as any
+      } as any;
+      
+      const fileTree = [
+        "path/to/another/src",
+        "path/to/another/src/hello.component.ts",
+        "path/to/another/hello.module.ts",
+        "path/to/another"
+      ];
+      const fileToModify = filesToAffect(mockFilePath, fileTree, mockParameter, 'felipe');
+      expect(fileToModify).toEqual(NOT_SUPPORTED);
+    });
+
+    it('should return NOT_SUPPORTED if language supported but type is not', () => {
+      const mockFilePath = 'path/to/another/src/hello.component.ts';
+      const mockParameter = {
+        optionalTypes: {},
+        type: 'yolo' as any
+      } as any;
+      
+      const fileTree = [
+        "path/to/another/src",
+        "path/to/another/src/hello.component.ts",
+        "path/to/another/hello.module.ts",
+        "path/to/another"
+      ];
+      const fileToModify = filesToAffect(mockFilePath, fileTree, mockParameter, 'angular');
+      expect(fileToModify).toEqual(NOT_SUPPORTED);
+    })
+  })
+
   describe('insertIntoHtmlTag', () => {
     it('should insert html into the specified tag if parent tag is div', () => {
       const fileToBeAddedTo = readFileSync('src/rz/angular/snapshots/insert-into-html-tag/insert-into-html-tag.html.snap').toString();
diff --git a/src/rz/morph/morph.ts b/src/rz/morph/morph.ts
index 9ffdf30..8418ba2 100644
--- a/src/rz/morph/morph.ts
+++ b/src/rz/morph/morph.ts
@@ -11,7 +11,7 @@ import { EditJsonInput } from '../json/interfaces/json-morph.interface';
 import { angularEffects, angularFilesToAffect, angularStandaloneEffects } from '../angular/angular-effects';
 import { reactTypes } from '../react';
 import { TemplateInputParameter } from '../utils/interfaces/template-parameters';
-import { EditFileEffect } from './interfaces/morph.interface';
+import { EditFileEffect, NOT_SUPPORTED, NOT_SUPPORTED_TYPE } from './interfaces/morph.interface';
 
 // takes in singular object and makes all edits to files 
 // used when editing a file
@@ -38,12 +38,12 @@ export interface Parameters {
 
 // sister function to "effects"
 // This function happens first and then effects is called
-export function filesToAffect(filePathWithName: string, fileTree: string[], parameter: TemplateInputParameter, programmingLanguage: string): string[] {
+export function filesToAffect(filePathWithName: string, fileTree: string[], parameter: TemplateInputParameter, programmingLanguage: string): string[] | NOT_SUPPORTED_TYPE {
   switch(programmingLanguage) {
     case 'angular':
       return angularFilesToAffect(filePathWithName, fileTree, (parameter.type) as AngularTypeNames, (parameter.optionalTypes) as any as AngularOptionalType[]);
     default:
-      return [];
+      return NOT_SUPPORTED;
   }
 }
 
@@ -58,7 +58,7 @@ export function standaloneEffects(programmingLanguage: string, parameter: Templa
     case CommunityPaths.Angular:
       return angularStandaloneEffects((parameter.type) as AngularTypeNames, fileEffects)
     default:
-      return []  
+      return []
   }
 }