diff --git a/package.json b/package.json
index 8aa267aa6..df361ae61 100644
--- a/package.json
+++ b/package.json
@@ -169,6 +169,7 @@
   "devDependencies": {
     "@babel/cli": "7.1.2",
     "@babel/plugin-proposal-optional-chaining": "7.0.0",
+    "@types/async": "2.0.50",
     "@types/i18n": "0.8.3",
     "@types/node": "10.11.7",
     "@types/os-locale": "2.1.0",
diff --git a/src/lib/modules/debugger/debugger_manager.ts b/src/lib/modules/debugger/debugger_manager.ts
index b47df63b4..f4202fd94 100644
--- a/src/lib/modules/debugger/debugger_manager.ts
+++ b/src/lib/modules/debugger/debugger_manager.ts
@@ -1,6 +1,5 @@
-const RemixDebug = require("remix-debug-debugtest");
-const CmdLine = RemixDebug.CmdLine;
-const async = require("async");
+import async from "async";
+import { CmdLine } from "remix-debug-debugtest";
 
 export default class DebuggerManager {
   private nodeUrl: string;
diff --git a/yarn.lock b/yarn.lock
index 1f47812fa..d7de39ba1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -801,6 +801,18 @@
   dependencies:
     array-from "^2.1.1"
 
+"@types/async@2.0.50":
+  version "2.0.50"
+  resolved "https://registry.yarnpkg.com/@types/async/-/async-2.0.50.tgz#117540e026d64e1846093abbd5adc7e27fda7bcb"
+  integrity sha512-VMhZMMQgV1zsR+lX/0IBfAk+8Eb7dPVMWiQGFAt3qjo5x7Ml6b77jUo0e1C3ToD+XRDXqtrfw+6AB0uUsPEr3Q==
+
+"@types/bn.js@*":
+  version "4.11.3"
+  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.3.tgz#0f09e53e98659b007d7019261ddab9178135df38"
+  integrity sha512-auZ3vEo3UW8tZc9NhF0MTnutKlf+YhsfC3+dwskFcil/EoqqZF60pGuJ2v2Ae1OJTUp3DJnjOJMqrpkmKB904w==
+  dependencies:
+    "@types/node" "*"
+
 "@types/debug@^0.0.30":
   version "0.0.30"
   resolved "https://registry.yarnpkg.com/@types/debug/-/debug-0.0.30.tgz#dc1e40f7af3b9c815013a7860e6252f6352a84df"
@@ -857,11 +869,24 @@
   dependencies:
     "@types/node" "*"
 
+"@types/underscore@*":
+  version "1.8.9"
+  resolved "https://registry.yarnpkg.com/@types/underscore/-/underscore-1.8.9.tgz#fef41f800cd23db1b4f262ddefe49cd952d82323"
+  integrity sha512-vfzZGgZKRFy7KEWcBGfIFk+h6B+thDCLfkD1exMBMRlUsx2icA+J6y4kAbZs/TjSTeY1duw89QUU133TSzr60Q==
+
 "@types/url-join@^0.8.2":
   version "0.8.2"
   resolved "https://registry.yarnpkg.com/@types/url-join/-/url-join-0.8.2.tgz#1181ecbe1d97b7034e0ea1e35e62e86cc26b422d"
   integrity sha1-EYHsvh2XtwNODqHjXmLobMJrQi0=
 
+"@types/web3@1.0.12":
+  version "1.0.12"
+  resolved "https://registry.yarnpkg.com/@types/web3/-/web3-1.0.12.tgz#dd7867ca24040b89577a20b7b07ad662de49c2c0"
+  integrity sha512-CZDwP4Opy2BjWfux+o05DXG0SSIyj7BQt7kYR+M8a8f/wTjJgre1JEECYUQ8Yu9NQg4yX4g7BjW2/Bd1KbZHOg==
+  dependencies:
+    "@types/bn.js" "*"
+    "@types/underscore" "*"
+
 "@webassemblyjs/ast@1.7.6":
   version "1.7.6"
   resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.7.6.tgz#3ef8c45b3e5e943a153a05281317474fef63e21e"