diff --git a/test/dev-deps-w-dev.test.js b/test/dev-deps-w-dev.test.js
deleted file mode 100644
index 4560c1f19d..0000000000
--- a/test/dev-deps-w-dev.test.js
+++ /dev/null
@@ -1,80 +0,0 @@
-'use strict';
-var test = require('tap').test;
-var path = require('path');
-var snyk = require('../src/lib');
-
-var dir = path.resolve(__dirname, 'fixtures', 'dev-deps-demo');
-
-var oldValue = null;
-test('setup', function(t) {
-  var config = require('../src/lib/config');
-  oldValue = config.devDeps;
-  config.devDeps = true;
-  t.pass('config primed');
-  t.end();
-});
-
-test('dev deps: dev-deps-demo, including dev deps', function(t) {
-  function runTests(t, error, modules) {
-    var expectedDirectDeps = {
-      'uglify-js': '2.3.6',
-      qs: '0.6.6',
-      semver: '3.0.1',
-      'kind-of': '2.0.1',
-      'dev-deps-demo': null,
-    };
-
-    if (error) {
-      t.fail(error.message);
-      t.bailout();
-    }
-
-    var keys = Object.keys(modules.dependencies);
-    var count = keys.length;
-    t.equal(count, 4, 'dep count');
-
-    keys.forEach(function(key) {
-      t.ok(expectedDirectDeps[key] !== undefined, key + ' was expected');
-
-      // For kind-of, test that its child dependencies were properly included
-      if (key === 'kind-of') {
-        var childDeps = modules.dependencies[key].dependencies;
-        var childKeys = Object.keys(childDeps);
-        t.equal(childKeys.length, 2, 'dep count of kind-of');
-
-        // Check child dependencies
-        t.ok(
-          childDeps['is-buffer'] !== undefined,
-          'is-buffer child dep was expected',
-        );
-        t.ok(
-          childDeps['typeof'] !== undefined,
-          'typeof child dep was expected',
-        );
-      } else {
-        t.equal(
-          expectedDirectDeps[key],
-          modules.dependencies[key].version,
-          key + ' version is correct',
-        );
-      }
-    });
-    t.end();
-  }
-
-  snyk.modules(dir, { dev: true }).then(function(modules) {
-    var error = null;
-    if (error) {
-      console.log(error.stack);
-    }
-    runTests(t, error, modules);
-  });
-});
-
-var oldValue = null;
-test('teardown', function(t) {
-  var config = require('../src/lib/config');
-  config.devDeps = oldValue;
-  t.pass('config restored');
-  t.end();
-});
diff --git a/test/dev-deps-with-dev.test.ts b/test/dev-deps-with-dev.test.ts
new file mode 100644
index 0000000000..de66f255c6
--- /dev/null
+++ b/test/dev-deps-with-dev.test.ts
@@ -0,0 +1,62 @@
+import { test } from 'tap';
+import * as path from 'path';
+
+import * as snyk from '../src/lib';
+import * as config from '../src/lib/config';
+
+const dir = path.resolve(__dirname, 'fixtures', 'dev-deps-demo');
+
+let oldValue = null;
+
+test('setup', async (t) => {
+  oldValue = (config as any).devDeps;
+  (config as any).devDeps = true;
+  t.pass('config primed');
+});
+
+test('dev deps: dev-deps-demo, including dev deps', async (t) => {
+  const expectedDirectDeps = {
+    qs: '0.6.6',
+    semver: '3.0.1',
+    'kind-of': '2.0.1',
+    'uglify-js': '2.3.6',
+    'dev-deps-demo': null,
+  };
+
+  try {
+    const modules = await snyk.modules(dir, { dev: true });
+    const keys = Object.keys(modules.dependencies);
+    t.equal(keys.length, 4, 'dep count');
+
+    keys.forEach((key) => {
+      t.ok(expectedDirectDeps[key] !== undefined, key + ' was expected');
+
+      // For kind-of, test that its child dependencies were properly included
+      if (key === 'kind-of') {
+        const childDeps = modules.dependencies[key].dependencies;
+        const childKeys = Object.keys(childDeps);
+        t.equal(childKeys.length, 2, 'dep count of kind-of');
+
+        // Check child dependencies
+        t.ok(
+          childDeps['is-buffer'] !== undefined,
+          'is-buffer child dep was expected',
+        );
+        t.ok(childDeps.typeof !== undefined, 'typeof child dep was expected');
+      } else {
+        t.equal(
+          expectedDirectDeps[key],
+          modules.dependencies[key].version,
+          key + ' version is correct',
+        );
+      }
+    });
+  } catch (e) {
+    t.threw(e);
+  }
+});
+
+test('teardown', async (t) => {
+  (config as any).devDeps = oldValue;
+  t.pass('config restored');
+});