Add example for starting cds with ts-node

hello/package.json

@@ -2,6 +2,7 @@
   "name": "@capire/hello-world",
   "version": "1.0.0",
   "scripts": {
-    "watch": "cds serve world.cds"
+    "watch": "cds serve world.cds",
+    "watch:ts": "npx ts-node ../node_modules/@sap/cds/bin/cds serve world.cds"
   }
 }

hello/world.ts

@@ -0,0 +1,5 @@
+module.exports = class say {
+    hello(req: any) {
+        return `Hello ${req.data.to} from a typescript file!`
+    }
+}

package.json

@@ -16,11 +16,14 @@
     "express": "^4"
   },
   "devDependencies": {
+    "@types/jest": "^26.0.23",
+    "@types/node": "^15.12.0",
     "cds-swagger-ui-express": "^0.2.0",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "chai-subset": "^1.6.0",
-    "sqlite3": "^5.0.0"
+    "sqlite3": "^5.0.0",
+    "ts-jest": "^27.0.2"
   },
   "scripts": {
     "cleanup": "rm -rf node_modules && rm -rf */node_modules && rm -rf */*/node_modules",
@@ -30,7 +33,8 @@
     "media": "cds watch media",
     "mocha": "npx mocha || echo",
     "jest": "npx jest",
-    "test": "npm run jest --silent"
+    "test": "npm run jest --silent --testMatch test/*.test.js && npm run test:ts",
+    "test:ts": "npm run jest --silent --preset ts-jest --testMatch test/*.test.ts"
   },
   "mocha": {
     "parallel": true

test/hello-world-ts.test.ts

@@ -0,0 +1,13 @@
+const testKit = require('../test')
+process.env.TYPESCRIPT_SUPPORT = 'true';
+
+const {GET} = testKit.run('serve', 'hello/world.cds')
+
+describe('Hello world!', () => {
+
+    it('should say hello with class impl from a typescript file', async () => {
+        const {data} = await GET`/say/hello(to='world')`
+        expect(data.value).toEqual('Hello world from a typescript file!')
+    })
+
+})