Fix ts-node invocation in balena-dev

Properly pull in the project file, as it exists in a different
directory.

Change-type: patch
Signed-off-by: Cameron Diver <cameron@balena.io>

bin/balena-dev

@@ -11,13 +11,19 @@ process.env.UV_THREADPOOL_SIZE = '64';
 
 // Use fast-boot to cache require lookups, speeding up startup
 require('fast-boot2').start({
-	cacheFile: '.fast-boot.json'
+	cacheFile: '.fast-boot.json',
 });
 require('coffeescript/register');
+
+const path = require('path');
+const rootDir = path.join(__dirname, '..');
 // Note: before ts-node v6.0.0, 'transpile-only' (no type checking) was the
 // default option. We upgraded ts-node and found that adding 'transpile-only'
 // was necessary to avoid a mysterious 'null' error message. On the plus side,
 // it is supposed to run faster. We still benefit from type checking when
 // running 'npm run build'.
-require('ts-node/register/transpile-only');
+require('ts-node').register({
+	project: path.join(rootDir, 'tsconfig.json'),
+	transpileOnly: true,
+});
 require('../lib/app').run();