diff --git a/bin/cli.js b/bin/cli.js
index 4d937b8..68082fd 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -1,6 +1,10 @@
 #!/usr/bin/env node
 "use strict";
-const fs = require("fs");
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const fs_1 = __importDefault(require("fs"));
 const port = getPortnumber();
 const testsPort = port + 1;
 const objPorts = { 'port': port, 'testsPort': testsPort };
@@ -9,8 +13,8 @@ let wpEnvJsonData;
 /**
  * Check if ".wp-env.json" exist.
  */
-if (fs.existsSync(wpEnvJson)) {
-    wpEnvJsonData = JSON.parse(fs.readFileSync(wpEnvJson, 'utf8'));
+if (fs_1.default.existsSync(wpEnvJson)) {
+    wpEnvJsonData = JSON.parse(fs_1.default.readFileSync(wpEnvJson, 'utf8'));
     // Add numbers for "port" and "testsPort".
     Object.keys(objPorts).forEach(key => {
         wpEnvJsonData[key] = objPorts[key];
@@ -23,7 +27,7 @@ else {
 /**
  * Write to .wp-env.json.
  */
-fs.writeFileSync(wpEnvJson, JSON.stringify(wpEnvJsonData, null, 2));
+fs_1.default.writeFileSync(wpEnvJson, JSON.stringify(wpEnvJsonData, null, 2));
 /**
  * Generate port number from time stamp.
  * Function restarts if port number has unwanted values.
diff --git a/bin/cli.js.map b/bin/cli.js.map
index 2385dce..d714635 100644
--- a/bin/cli.js.map
+++ b/bin/cli.js.map
@@ -1 +1 @@
-{"version":3,"file":"cli.js","sourceRoot":"","sources":["../src/cli.ts"],"names":[],"mappings":";;AAEA,MAAM,EAAE,GAAG,OAAO,CAAC,IAAI,CAAC,CAAC;AACzB,MAAM,IAAI,GAAG,aAAa,EAAE,CAAC;AAC7B,MAAM,SAAS,GAAG,IAAI,GAAG,CAAC,CAAC;AAC3B,MAAM,QAAQ,GAAgC,EAAC,MAAM,EAAE,IAAI,EAAE,WAAW,EAAE,SAAS,EAAC,CAAA;AACpF,MAAM,SAAS,GAAG,cAAc,CAAC;AACjC,IAAI,aAA0C,CAAA;AAE9C;;GAEG;AACH,IAAI,EAAE,CAAC,UAAU,CAAC,SAAS,CAAC,EAAE;IAC1B,aAAa,GAAG,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC,YAAY,CAAC,SAAS,EAAE,MAAM,CAAC,CAAC,CAAA;IAC9D,0CAA0C;IAC1C,MAAM,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC,OAAO,CAAC,GAAG,CAAC,EAAE;QAChC,aAAa,CAAC,GAAG,CAAC,GAAG,QAAQ,CAAC,GAAG,CAAC,CAAA;IACtC,CAAC,CAAC,CAAC;CACN;KAAM;IACH,wBAAwB;IACxB,aAAa,GAAG,QAAQ,CAAC;CAC5B;AAED;;GAEG;AACH,EAAE,CAAC,aAAa,CAAC,SAAS,EAAE,IAAI,CAAC,SAAS,CAAC,aAAa,EAAE,IAAI,EAAE,CAAC,CAAC,CAAC,CAAA;AAEnE;;;;;GAKG;AACH,SAAS,aAAa;IAClB,qCAAqC;IACrC,MAAM,SAAS,GAAG,KAAK,CAAA;IACvB,IAAI,UAAU,GAAG,QAAQ,CAAC,IAAI,CAAC,GAAG,EAAE,CAAC,QAAQ,EAAE,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;IAC3D,IAAI,UAAU,IAAI,SAAS,EAAE;QACzB,UAAU,GAAG,QAAQ,CAAC,UAAU,CAAC,QAAQ,EAAE,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;KAC1D;IAED,0BAA0B;IAC1B,MAAM,cAAc,GAAG,CAAC,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,GAAG,EAAE,GAAG,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,KAAK,CAAC,CAAA;IAC3G,IAAI,cAAc,CAAC,QAAQ,CAAC,UAAU,CAAC,EAAE;QACrC,aAAa,EAAE,CAAA;KAClB;IAED,OAAO,UAAU,CAAA;AACrB,CAAC"}
\ No newline at end of file
+{"version":3,"file":"cli.js","sourceRoot":"","sources":["../src/cli.ts"],"names":[],"mappings":";;;;;;AAEA,4CAAoB;AACpB,MAAM,IAAI,GAAG,aAAa,EAAE,CAAC;AAC7B,MAAM,SAAS,GAAG,IAAI,GAAG,CAAC,CAAC;AAC3B,MAAM,QAAQ,GAAgC,EAAC,MAAM,EAAE,IAAI,EAAE,WAAW,EAAE,SAAS,EAAC,CAAA;AACpF,MAAM,SAAS,GAAG,cAAc,CAAC;AACjC,IAAI,aAA0C,CAAA;AAE9C;;GAEG;AACH,IAAI,YAAE,CAAC,UAAU,CAAC,SAAS,CAAC,EAAE;IAC1B,aAAa,GAAG,IAAI,CAAC,KAAK,CAAC,YAAE,CAAC,YAAY,CAAC,SAAS,EAAE,MAAM,CAAC,CAAC,CAAA;IAC9D,0CAA0C;IAC1C,MAAM,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC,OAAO,CAAC,GAAG,CAAC,EAAE;QAChC,aAAa,CAAC,GAAG,CAAC,GAAG,QAAQ,CAAC,GAAG,CAAC,CAAA;IACtC,CAAC,CAAC,CAAC;CACN;KAAM;IACH,wBAAwB;IACxB,aAAa,GAAG,QAAQ,CAAC;CAC5B;AAED;;GAEG;AACH,YAAE,CAAC,aAAa,CAAC,SAAS,EAAE,IAAI,CAAC,SAAS,CAAC,aAAa,EAAE,IAAI,EAAE,CAAC,CAAC,CAAC,CAAA;AAEnE;;;;;GAKG;AACH,SAAS,aAAa;IAClB,qCAAqC;IACrC,MAAM,SAAS,GAAG,KAAK,CAAA;IACvB,IAAI,UAAU,GAAG,QAAQ,CAAC,IAAI,CAAC,GAAG,EAAE,CAAC,QAAQ,EAAE,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;IAC3D,IAAI,UAAU,IAAI,SAAS,EAAE;QACzB,UAAU,GAAG,QAAQ,CAAC,UAAU,CAAC,QAAQ,EAAE,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;KAC1D;IAED,0BAA0B;IAC1B,MAAM,cAAc,GAAG,CAAC,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,GAAG,EAAE,GAAG,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,IAAI,EAAE,KAAK,CAAC,CAAA;IAC3G,IAAI,cAAc,CAAC,QAAQ,CAAC,UAAU,CAAC,EAAE;QACrC,aAAa,EAAE,CAAA;KAClB;IAED,OAAO,UAAU,CAAA;AACrB,CAAC"}
\ No newline at end of file
diff --git a/src/cli.ts b/src/cli.ts
index 94832ce..fe55e2e 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-const fs = require("fs");
+import fs from 'fs';
 const port = getPortnumber();
 const testsPort = port + 1;
 const objPorts: { [index: string]: number } = {'port': port, 'testsPort': testsPort}