fix: trace dependency with nft (#3)

* fix: trace dependency with nft

* add esbuild as dependency

* tweaks

example/handler.ts

@@ -1,8 +1,10 @@
 import type { Handler } from '../'
+import { transform } from 'esbuild'
 
-export const handler: Handler = (req, res, next) => {
+export const handler: Handler = async (req, res, next) => {
   if (req.path === '/foo') {
-    res.end('foo')
+    const result = await transform(`export const foo = 1`, { format: 'cjs' })
+    res.end(result.code)
     return
   }
   next()

example/test-function.js

@@ -0,0 +1,9 @@
+const polka = require('polka')
+
+const app = polka()
+const handler = require('./.vercel_build_output/functions/node/render').default
+
+app.use(handler)
+
+app.listen(3000)
+console.log('http://localhost:3000')

package.json

@@ -28,6 +28,7 @@
     "@sucrase/jest-plugin": "^2.0.0",
     "@types/jest": "^26.0.20",
     "@types/polka": "^0.5.2",
+    "esbuild": "^0.11.13",
     "jest": "^26.6.3",
     "polka": "^0.5.2",
     "prettier": "^2.2.1",
@@ -42,6 +43,6 @@
     "vite": "^2.2.1"
   },
   "dependencies": {
-    "esbuild": "^0.11.13"
+    "@vercel/nft": "^0.10.1"
   }
 }