diff --git a/lib/utils/colors.js b/lib/utils/colors.js
index 1abb049207..9df8f8ae69 100644
--- a/lib/utils/colors.js
+++ b/lib/utils/colors.js
@@ -1,6 +1,12 @@
 'use strict';
 
 const colors = {
+  /**
+   * info color Method
+   * @param {?boolean} useColor - use color with  message
+   * @param {string} msg -  log message
+   * @returns {string}
+   */
   info(useColor, msg) {
     if (useColor) {
       // Make text blue and bold, so it *pops*
@@ -9,6 +15,12 @@ const colors = {
 
     return msg;
   },
+  /**
+   * error color Method
+   * @param {?boolean} useColor - use color with  message
+   * @param {string} msg -  log message
+   * @returns {string}
+   */
   error(useColor, msg) {
     if (useColor) {
       // Make text red and bold, so it *pops*
diff --git a/lib/utils/createCertificate.js b/lib/utils/createCertificate.js
index e701f8d559..c58cbdd4bb 100644
--- a/lib/utils/createCertificate.js
+++ b/lib/utils/createCertificate.js
@@ -1,7 +1,20 @@
 'use strict';
 
 const selfsigned = require('selfsigned');
+/**
+ * Pem Type generated by the generatePem method of selfsigned package
+ * @typedef {Object} pemType
+ * @property {string} private - privateKeyToPem
+ * @property {string} public - publicKeyToPem
+ * @property {string} cert - certificateToPem
+ * @property {string} fingerprint
+ */
 
+/**
+ * Create Certificate Method
+ * @param {Object} attributes - selfsigned attributes refs : https://github.com/digitalbazaar/forge/blob/0.7.5/lib/x509.js#L129
+ * @returns {pemType}
+ */
 function createCertificate(attributes) {
   return selfsigned.generate(attributes, {
     algorithm: 'sha256',
diff --git a/lib/utils/createConfig.js b/lib/utils/createConfig.js
index 5c15b35c39..d25cf0768e 100644
--- a/lib/utils/createConfig.js
+++ b/lib/utils/createConfig.js
@@ -4,6 +4,24 @@ const path = require('path');
 const isAbsoluteUrl = require('is-absolute-url');
 const defaultTo = require('./defaultTo');
 
+/**
+ * Webpack-dev-server options
+ * @typedef {Object} WDSOptions - refs  https://github.com/webpack/webpack-dev-server/blob/master/bin/options.js#L14
+ */
+
+/**
+ * Custom Configs passed as third argument to createConfig method
+ * @typedef {Object} customConfigs
+ * @property {number} port - port to listen
+ */
+
+/**
+ * Create Config Method
+ * @param {Object} config - Webpack config, refs https://webpack.js.org/configuration/
+ * @param {Object} argv - WDS CLI Arguments passed, refs https://github.com/webpack/webpack-dev-server/blob/master/bin/options.js#L14
+ * @param {customConfigs} customArgs
+ * @returns {WDSOptions}
+ */
 function createConfig(config, argv, { port }) {
   const firstWpOpt = Array.isArray(config) ? config[0] : config;
   const options = firstWpOpt.devServer || {};
diff --git a/tsconfig.json b/tsconfig.json
index 8e65f3f910..77e038bcc7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,5 +12,10 @@
     "types": ["node"],
     "esModuleInterop": true
   },
-  "include": ["lib/utils/addEntries.js"]
+  "include": [
+    "lib/utils/addEntries.js",
+    "lib/utils/colors.js",
+    "lib/utils/createCertificate.js",
+    "lib/utils/createConfig.js"
+  ]
 }