feat: Typescript for API layer (#817)

Co-authored-by: Philip Korsholm <88927411+pKorsholm@users.noreply.github.com>
Co-authored-by: Zakaria El Asri <33696020+zakariaelas@users.noreply.github.com>
Co-authored-by: Kasper Fabricius Kristensen <45367945+kasperkristensen@users.noreply.github.com>
Co-authored-by: Philip Korsholm <philip.korsholm@hotmail.com>
Co-authored-by: Sebastian Rindom <seb@medusa-commerce.com>

packages/medusa/package.json

@@ -20,21 +20,24 @@
     "@babel/cli": "^7.14.3",
     "@babel/core": "^7.14.3",
     "@babel/preset-typescript": "^7.13.0",
+    "@types/express": "^4.17.13",
+    "@types/jsonwebtoken": "^8.5.5",
     "babel-preset-medusa-package": "^1.1.17",
     "cross-env": "^5.2.1",
-    "eslint": "^6.8.0",
+    "eslint": "^7.32.0",
     "jest": "^25.5.2",
     "medusa-interfaces": "^1.1.27",
     "nodemon": "^2.0.1",
     "prettier": "^1.19.1",
     "sqlite3": "^5.0.2",
-    "supertest": "^4.0.2"
+    "supertest": "^4.0.2",
+    "typescript": "^4.4.4"
   },
   "scripts": {
     "start": "nodemon --watch plugins/ --watch src/ --exec babel-node src/app.js",
-    "watch": "babel -w src --out-dir dist/ --ignore **/__tests__ --extensions \".ts,.js\"",
+    "watch": "tsc --build --watch",
     "prepare": "cross-env NODE_ENV=production npm run build",
-    "build": "babel src -d dist --ignore **/__tests__ --extensions \".ts,.js\"",
+    "build": "tsc --build",
     "serve": "node dist/app.js",
     "test": "jest",
     "test:unit": "jest"
@@ -51,6 +54,8 @@
     "body-parser": "^1.19.0",
     "bull": "^3.12.1",
     "chokidar": "^3.4.2",
+    "class-transformer": "^0.4.0",
+    "class-validator": "^0.13.1",
     "connect-redis": "^5.0.0",
     "cookie-parser": "^1.4.4",
     "core-js": "^3.6.5",
@@ -88,4 +93,4 @@
     "winston": "^3.2.1"
   },
   "gitHead": "5afd0dfbabaebfb6b09f0e2f055386ac76059372"
-}
+}