refactor

server/build.js

@@ -0,0 +1,9 @@
+import { build } from 'esbuild'
+
+build({
+    entryPoints: ['./src/index.ts'],
+    format: 'esm',
+    platform: 'node',
+    target: 'node10.4',
+    outdir: './dist',
+}).then(r => console.log('Successfully build.'))