diff --git a/packages/generators/add-generator.ts b/packages/generators/add-generator.ts
index 014ac28f798..985f7823547 100644
--- a/packages/generators/add-generator.ts
+++ b/packages/generators/add-generator.ts
@@ -9,7 +9,6 @@ import {
 } from "./utils/add/questions";
 
 import {
-	replaceAt,
 	traverseAndGetProperties,
 	webpackDevServerSchema,
 	webpackSchema
@@ -112,7 +111,7 @@ export default class AddGenerator extends Generator {
 							.then((mergeFileAnswer: {
 								mergeFile: string,
 								mergeConfigName: string
-							}) => {
+							}):void => {
 								const resolvedPath = resolve(process.cwd(), mergeFileAnswer.mergeFile);
 								// eslint-disable-next-line
 								this.configuration.config[action] = [mergeFileAnswer.mergeConfigName, resolvedPath];
diff --git a/packages/generators/utils/add/questions/index.ts b/packages/generators/utils/add/questions/index.ts
index 6b08b8709bf..fbbc0dfe138 100644
--- a/packages/generators/utils/add/questions/index.ts
+++ b/packages/generators/utils/add/questions/index.ts
@@ -16,7 +16,7 @@ import { Question } from "inquirer";
  * @param {string} action action for which question has to be prompted
  * @returns {Question} Question for given action
  */
-export const manualOrListInput: (action: string) => Question = (action: string) => {
+export const manualOrListInput = (action: string): Question => {
 	const actionQuestion = `What do you want to add to ${action}?`;
 	return Input("actionAnswer", actionQuestion);
 };
@@ -42,9 +42,9 @@ export const topScopeQuestion: Question = Input(
 	"What do you want to add to topScope?",
 );
 
-const mergeFileQuestionsFunction = () => {
+const mergeFileQuestionsFunction = (): Question[] => {
  const mergePathQuestion = "What is the location of webpack configuration with which you want to merge current configuration?";
- const mergePathValidator = (path: string) => {
+ const mergePathValidator = (path: string): boolean|string => {
 		const resolvedPath = resolve(process.cwd(), path);
 		if (existsSync(resolvedPath)) {
 			if (/\.js$/.test(path)) {
diff --git a/packages/utils/ast-utils.ts b/packages/utils/ast-utils.ts
index 83b39f11f72..c1dc17a15f7 100644
--- a/packages/utils/ast-utils.ts
+++ b/packages/utils/ast-utils.ts
@@ -7,7 +7,7 @@ function isImportPresent (j: JSCodeshift, ast: Node, path: string): boolean {
 		throw new Error(`path parameter should be string, recieved ${typeof path}`);
 	}
 	let isPresent = false;
-	ast.find(j.CallExpression).forEach(callExp => {
+	ast.find(j.CallExpression).forEach((callExp: Node): void => {
 		if ((callExp.value as Node).callee.name === 'require' && (callExp.value as Node).arguments[0].value === path) {
 			isPresent = true;
 		}
@@ -648,11 +648,11 @@ function parseMerge(j: JSCodeshift, ast: Node, value: string[], action: string):
 		return false; // TODO: debug later
 	}
 
-	function addMergeImports(configIdentifier: string, configPath: string) {
+	function addMergeImports(configIdentifier: string, configPath: string): void {
 		if (typeof configIdentifier !== "string" || typeof configPath !== "string") {
-			throw new Error(`Both parameters should be string. Recieved ${configIdentifier}, ${configPath}`)
+			throw new Error(`Both parameters should be string. recieved ${typeof configIdentifier}, ${typeof configPath}`)
 		}
-		ast.find(j.Program).forEach(p => {
+		ast.find(j.Program).forEach((p: Node): void => {
 			if (!isImportPresent(j, ast, 'webpack-merge')) {
 				(p.value as Node).body.splice(-1, 0, `const merge = require('webpack-merge')`);
 			}