run build before start

bin/next-start

@@ -1,9 +1,10 @@
 #!/usr/bin/env node
 
-import { resolve } from 'path'
+import { resolve, join } from 'path'
 import parseArgs from 'minimist'
 import Server from '../server'
 import {exists} from 'mz/fs'
+import { spawn } from 'cross-spawn'
 
 const argv = parseArgs(process.argv.slice(2), {
   alias: {
@@ -40,11 +41,13 @@ const dir = resolve(argv._[0] || '.')
 
 const srv = new Server({ dir })
 
-exists(resolve(process.cwd(), '.next')).then(exists => {
+exists(resolve(dir, '.next')).then(exists => {
   if (!exists) {
-    console.error(`> Error! The application should be compiled with \`next build\` first.`)
-    process.exit(0)
+    console.log(`> Running \`next build\` first...`)
+    return spawn.sync(join(__dirname, 'next-build'), { stdio: 'inherit', customFds: [0, 1, 2] })
   }
+})
+.then(() => {
   srv.start(argv.port)
 })
 .then(() => {