diff --git a/src/lib/migration.coffee b/src/lib/migration.coffee
deleted file mode 100644
index d60cd32e..00000000
--- a/src/lib/migration.coffee
+++ /dev/null
@@ -1,53 +0,0 @@
-
-exports.defaultLegacyVolume = -> 'resin-data'
-
-exports.singleToMulticontainerApp = (app) ->
-	environment = {}
-	for key of app.env
-		if !/^RESIN_/.test(key)
-			environment[key] = app.env[key]
-
-	appId = app.appId
-	conf = app.config ? {}
-	newApp = {
-		appId: appId
-		commit: app.commit
-		name: app.name
-		releaseId: 1
-		networks: {}
-		volumes: {}
-	}
-	defaultVolume = exports.defaultLegacyVolume()
-	newApp.volumes[defaultVolume] = {}
-	updateStrategy = conf['RESIN_SUPERVISOR_UPDATE_STRATEGY'] ? 'download-then-kill'
-	handoverTimeout = conf['RESIN_SUPERVISOR_HANDOVER_TIMEOUT'] ? ''
-	restartPolicy = conf['RESIN_APP_RESTART_POLICY'] ? 'always'
-	newApp.services = {
-		'1': {
-			appId: appId
-			serviceName: 'main'
-			imageId: 1
-			commit: app.commit
-			releaseId: 1
-			image: app.imageId
-			privileged: true
-			networkMode: 'host'
-			volumes: [
-				"#{defaultVolume}:/data"
-			],
-			labels: {
-				'io.resin.features.kernel-modules': '1'
-				'io.resin.features.firmware': '1'
-				'io.resin.features.dbus': '1',
-				'io.resin.features.supervisor-api': '1'
-				'io.resin.features.resin-api': '1'
-				'io.resin.update.strategy': updateStrategy
-				'io.resin.update.handover-timeout': handoverTimeout
-				'io.resin.legacy-container': '1'
-			},
-			environment: environment
-			restart: restartPolicy
-			running: true
-		}
-	}
-	return newApp
diff --git a/src/lib/migration.ts b/src/lib/migration.ts
new file mode 100644
index 00000000..a0f5895e
--- /dev/null
+++ b/src/lib/migration.ts
@@ -0,0 +1,69 @@
+import * as _ from 'lodash';
+
+import { Application } from '../types/application';
+
+export const defaultLegacyVolume = () => 'resin-data';
+
+export function singleToMulticontainerApp(app: Dictionary<any>): Application {
+	const environment: Dictionary<string> = {};
+	for (const key in app.env) {
+		if (!/^RESIN_/.test(key)) {
+			environment[key] = app.env[key];
+		}
+	}
+
+	const { appId } = app;
+	const conf = app.config != null ? app.config : {};
+	const newApp = new Application();
+	_.assign(newApp, {
+		appId,
+		commit: app.commit,
+		name: app.name,
+		releaseId: 1,
+		networks: {},
+		volumes: {},
+	});
+	const defaultVolume = exports.defaultLegacyVolume();
+	newApp.volumes[defaultVolume] = {};
+	const updateStrategy =
+		conf['RESIN_SUPERVISOR_UPDATE_STRATEGY'] != null
+			? conf['RESIN_SUPERVISOR_UPDATE_STRATEGY']
+			: 'download-then-kill';
+	const handoverTimeout =
+		conf['RESIN_SUPERVISOR_HANDOVER_TIMEOUT'] != null
+			? conf['RESIN_SUPERVISOR_HANDOVER_TIMEOUT']
+			: '';
+	const restartPolicy =
+		conf['RESIN_APP_RESTART_POLICY'] != null
+			? conf['RESIN_APP_RESTART_POLICY']
+			: 'always';
+	newApp.services = {
+		// Disable the next line, as this *has* to be a string
+		// tslint:disable-next-line
+		'1': {
+			appId,
+			serviceName: 'main',
+			imageId: 1,
+			commit: app.commit,
+			releaseId: 1,
+			image: app.imageId,
+			privileged: true,
+			networkMode: 'host',
+			volumes: [`${defaultVolume}:/data`],
+			labels: {
+				'io.resin.features.kernel-modules': '1',
+				'io.resin.features.firmware': '1',
+				'io.resin.features.dbus': '1',
+				'io.resin.features.supervisor-api': '1',
+				'io.resin.features.resin-api': '1',
+				'io.resin.update.strategy': updateStrategy,
+				'io.resin.update.handover-timeout': handoverTimeout,
+				'io.resin.legacy-container': '1',
+			},
+			environment,
+			restart: restartPolicy,
+			running: true,
+		},
+	};
+	return newApp;
+}
diff --git a/src/types/application.ts b/src/types/application.ts
new file mode 100644
index 00000000..3afac3ef
--- /dev/null
+++ b/src/types/application.ts
@@ -0,0 +1,12 @@
+import { ServiceComposeConfig } from '../compose/types/service';
+
+export class Application {
+	public appId: number;
+	public commit: string;
+	public name: string;
+	public releaseId: number;
+	public networks: Dictionary<any>;
+	public volumes: Dictionary<any>;
+
+	public services: Dictionary<ServiceComposeConfig>;
+}