diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..ef87455
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,8 @@
+{
+  "all": true,
+  "plugins": ["istanbul"],
+  "include": ["src"],
+  "exclude": ["**/mock*", "**/*.test.ts"],
+  "sourceMaps": false,
+  "instrument": false
+}
diff --git a/coverage/lcov-report/add-number.ts.html b/coverage/lcov-report/add-number.ts.html
index 19c895a..d54b5cd 100644
--- a/coverage/lcov-report/add-number.ts.html
+++ b/coverage/lcov-report/add-number.ts.html
@@ -97,7 +97,7 @@ <h1><a href="index.html">All files</a> add-number.ts</h1>
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at Wed Apr 13 2022 13:51:46 GMT+0530 (India Standard Time)
+                at Wed Apr 13 2022 17:39:30 GMT+0530 (India Standard Time)
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/coverage/lcov-report/index.html b/coverage/lcov-report/index.html
index 5d3a841..80517d5 100644
--- a/coverage/lcov-report/index.html
+++ b/coverage/lcov-report/index.html
@@ -116,7 +116,7 @@ <h1>All files</h1>
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at Wed Apr 13 2022 13:51:46 GMT+0530 (India Standard Time)
+                at Wed Apr 13 2022 17:39:30 GMT+0530 (India Standard Time)
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/coverage/lcov-report/subtract-number.ts.html b/coverage/lcov-report/subtract-number.ts.html
index 52949c4..14c6c83 100644
--- a/coverage/lcov-report/subtract-number.ts.html
+++ b/coverage/lcov-report/subtract-number.ts.html
@@ -71,12 +71,10 @@ <h1><a href="index.html">All files</a> subtract-number.ts</h1>
 <a name='L6'></a><a href='#L6'>6</a>
 <a name='L7'></a><a href='#L7'>7</a>
 <a name='L8'></a><a href='#L8'>8</a>
-<a name='L9'></a><a href='#L9'>9</a>
-<a name='L10'></a><a href='#L10'>10</a></td><td class="line-coverage quiet"><span class="cline-any cline-no">&nbsp;</span>
+<a name='L9'></a><a href='#L9'>9</a></td><td class="line-coverage quiet"><span class="cline-any cline-no">&nbsp;</span>
 <span class="cline-any cline-no">&nbsp;</span>
 <span class="cline-any cline-no">&nbsp;</span>
 <span class="cline-any cline-neutral">&nbsp;</span>
-<span class="cline-any cline-neutral">&nbsp;</span>
 <span class="cline-any cline-no">&nbsp;</span>
 <span class="cline-any cline-neutral">&nbsp;</span>
 <span class="cline-any cline-neutral">&nbsp;</span>
@@ -85,7 +83,6 @@ <h1><a href="index.html">All files</a> subtract-number.ts</h1>
 <span class="cstat-no" title="statement not covered" >  <span class="missing-if-branch" title="if path not taken" >I</span>if (num1 &lt; 10 &amp;&amp; num2 &lt; 10) {</span>
 <span class="cstat-no" title="statement not covered" >    return num1 - num2</span>
   }
-&nbsp;
 <span class="cstat-no" title="statement not covered" >  return num1 - num2 + 10</span>
 }
 &nbsp;
@@ -97,7 +94,7 @@ <h1><a href="index.html">All files</a> subtract-number.ts</h1>
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at Wed Apr 13 2022 13:51:46 GMT+0530 (India Standard Time)
+                at Wed Apr 13 2022 17:39:30 GMT+0530 (India Standard Time)
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/coverage/lcov.info b/coverage/lcov.info
index 76ec9c0..f456de1 100644
--- a/coverage/lcov.info
+++ b/coverage/lcov.info
@@ -25,8 +25,8 @@ FNDA:0,(anonymous_0)
 DA:1,0
 DA:2,0
 DA:3,0
-DA:6,0
-DA:9,0
+DA:5,0
+DA:8,0
 LF:5
 LH:0
 BRDA:2,0,0,0
diff --git a/jest.config.json b/jest.config.json
index 9425161..c6d0fc4 100644
--- a/jest.config.json
+++ b/jest.config.json
@@ -2,7 +2,5 @@
   "testRegex": ".*\\.test\\.(ts)$",
   "transform": { "\\.[jt]sx?$": "ts-jest" },
   "moduleFileExtensions": ["ts", "js"],
-  "coverageReporters": ["lcov", ["text", { "skipFull": true }]],
-  "verbose": true,
-  "collectCoverageFrom": ["**/*.{ts, js}", "!**/node_modules/**", "!**/vendor/**"]
+  "collectCoverageFrom": ["**/*.ts", "!**/node_modules/**", "!**/vendor/**"]
 }
diff --git a/package.json b/package.json
index 71d4c5f..525e31e 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "dependencies": {
     "@istanbuljs/nyc-config-typescript": "^1.0.2",
     "@types/jest": "^27.4.1",
+    "babel-plugin-istanbul": "^6.1.1",
     "chai": "^4.3.6",
     "jest": "^27.5.1",
     "ts-jest": "^27.1.4"