fix(init): output details and exit error code if unexpected error (#40)

by handling `process.unhandledRejection` event

src/cli.js

@@ -1,6 +1,11 @@
 const yargs = require('yargs')
 const init = require('./init')
 
+process.on('unhandledRejection', (reason) => {
+  process.stderr.write(reason.stack)
+  process.exit(1)
+})
+
 module.exports = function cli() {
   // eslint-disable-next-line no-unused-expressions
   yargs

test/init.test.js

@@ -2,6 +2,7 @@ import path from 'path'
 import os from 'os'
 import fs from 'fs-extra'
 import assert from 'assert'
+import assertThrows from './assert-throws'
 import exec from './exec'
 
 suite('init', () => {
@@ -104,4 +105,14 @@ suite('init', () => {
 }
 `)
   })
+
+  test('error', async () => {
+    await fs.remove(packageJson)
+    const error = await assertThrows(() => exec('init'))
+    const { code, stdout, stderr } = error
+    assert(error instanceof Error)
+    assert(code === 1)
+    assert(stdout === '')
+    assert(stderr.includes('Error: ENOENT:'), stderr)
+  })
 })