diff --git a/tests/shared/messages.spec.js b/tests/shared/messages.spec.js
deleted file mode 100644
index 83257682..00000000
--- a/tests/shared/messages.spec.js
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * Copyright 2016 balena.io
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-'use strict'
-
-const m = require('mochainon')
-const _ = require('lodash')
-// eslint-disable-next-line node/no-missing-require
-const messages = require('../../lib/shared/messages')
-
-describe('Shared: Messages', function () {
-  beforeEach(function () {
-    this.drives = [
-      {
-        description: 'My Drive',
-        displayName: '/dev/disk1'
-      },
-      {
-        description: 'Other Drive',
-        displayName: '/dev/disk2'
-      }
-    ]
-  })
-
-  it('should contain object properties', function () {
-    m.chai.expect(_.every(_.map(messages, _.isPlainObject))).to.be.true
-  })
-
-  it('should contain function properties in each category', function () {
-    _.each(messages, (category) => {
-      m.chai.expect(_.every(_.map(category, _.isFunction))).to.be.true
-    })
-  })
-
-  describe('.info', function () {
-    describe('.flashComplete()', function () {
-      it('should use singular when there are single results', function () {
-        const msg = messages.info.flashComplete('image.img', this.drives, {
-          failed: 1,
-          successful: 1
-        })
-
-        m.chai.expect(msg).to.equal('image.img was successfully flashed to 1 target and failed to be flashed to 1 target')
-      })
-
-      it('should use plural when there are multiple results', function () {
-        const msg = messages.info.flashComplete('image.img', this.drives, {
-          failed: 2,
-          successful: 2
-        })
-
-        m.chai.expect(msg).to.equal('image.img was successfully flashed to 2 targets and failed to be flashed to 2 targets')
-      })
-
-      it('should not contain failed target part when there are none', function () {
-        const msg = messages.info.flashComplete('image.img', this.drives, {
-          failed: 0,
-          successful: 2
-        })
-
-        m.chai.expect(msg).to.equal('image.img was successfully flashed to 2 targets')
-      })
-
-      it('should show drive name and description when only target', function () {
-        const msg = messages.info.flashComplete('image.img', this.drives, {
-          failed: 0,
-          successful: 1
-        })
-
-        m.chai.expect(msg).to.equal('image.img was successfully flashed to My Drive (/dev/disk1)')
-      })
-    })
-  })
-
-  describe('.error', function () {
-    describe('.flashFailure()', function () {
-      it('should use plural when there are multiple drives', function () {
-        const msg = messages.error.flashFailure('image.img', this.drives)
-
-        m.chai.expect(msg).to.equal('Something went wrong while writing image.img to 2 targets.')
-      })
-
-      it('should use singular when there is one drive', function () {
-        const msg = messages.error.flashFailure('image.img', [ this.drives[0] ])
-
-        m.chai.expect(msg).to.equal('Something went wrong while writing image.img to My Drive (/dev/disk1).')
-      })
-    })
-  })
-})
diff --git a/tests/shared/messages.spec.ts b/tests/shared/messages.spec.ts
new file mode 100644
index 00000000..b0d18ad5
--- /dev/null
+++ b/tests/shared/messages.spec.ts
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016 balena.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { expect } from 'chai';
+import * as _ from 'lodash';
+
+import * as messages from '../../lib/shared/messages';
+
+describe('Shared: Messages', function() {
+	beforeEach(function() {
+		this.drives = [
+			{
+				description: 'My Drive',
+				displayName: '/dev/disk1',
+			},
+			{
+				description: 'Other Drive',
+				displayName: '/dev/disk2',
+			},
+		];
+	});
+
+	it('should contain object properties', function() {
+		expect(_.every(_.map(messages, _.isPlainObject))).to.be.true;
+	});
+
+	it('should contain function properties in each category', function() {
+		_.each(messages, category => {
+			expect(_.every(_.map(category, _.isFunction))).to.be.true;
+		});
+	});
+
+	describe('.info', function() {
+		describe('.flashComplete()', function() {
+			it('should use singular when there are single results', function() {
+				const msg = messages.info.flashComplete('image.img', this.drives, {
+					failed: 1,
+					successful: 1,
+				});
+
+				expect(msg).to.equal(
+					'image.img was successfully flashed to 1 target and failed to be flashed to 1 target',
+				);
+			});
+
+			it('should use plural when there are multiple results', function() {
+				const msg = messages.info.flashComplete('image.img', this.drives, {
+					failed: 2,
+					successful: 2,
+				});
+
+				expect(msg).to.equal(
+					'image.img was successfully flashed to 2 targets and failed to be flashed to 2 targets',
+				);
+			});
+
+			it('should not contain failed target part when there are none', function() {
+				const msg = messages.info.flashComplete('image.img', this.drives, {
+					failed: 0,
+					successful: 2,
+				});
+
+				expect(msg).to.equal('image.img was successfully flashed to 2 targets');
+			});
+
+			it('should show drive name and description when only target', function() {
+				const msg = messages.info.flashComplete('image.img', this.drives, {
+					failed: 0,
+					successful: 1,
+				});
+
+				expect(msg).to.equal(
+					'image.img was successfully flashed to My Drive (/dev/disk1)',
+				);
+			});
+		});
+	});
+
+	describe('.error', function() {
+		describe('.flashFailure()', function() {
+			it('should use plural when there are multiple drives', function() {
+				const msg = messages.error.flashFailure('image.img', this.drives);
+
+				expect(msg).to.equal(
+					'Something went wrong while writing image.img to 2 targets.',
+				);
+			});
+
+			it('should use singular when there is one drive', function() {
+				const msg = messages.error.flashFailure('image.img', [this.drives[0]]);
+
+				expect(msg).to.equal(
+					'Something went wrong while writing image.img to My Drive (/dev/disk1).',
+				);
+			});
+		});
+	});
+});