chore: return with an exit code of 1 on supplying an unknown command (#6079)

packages/@vue/cli/__tests__/args.spec.js

@@ -3,9 +3,12 @@ const execa = require('execa')
 
 const CLI_PATH = path.resolve(__dirname, '..', 'bin', 'vue.js')
 
-const runAsync = async args => await execa(CLI_PATH, args)
+const runAsync = (args, options) => execa(CLI_PATH, args, options)
 
 test('suggests matching command', async () => {
-  const { stdout } = await runAsync(['confgi'])
+  const { code, stdout } = await runAsync(['confgi'], { reject: false })
+
+  // Assertions
+  expect(code).toBe(1)
   expect(stdout).toContain('Did you mean config?')
 })

packages/@vue/cli/bin/vue.js

@@ -213,6 +213,7 @@ program
     console.log(`  ` + chalk.red(`Unknown command ${chalk.yellow(cmd)}.`))
     console.log()
     suggestCommands(cmd)
+    process.exitCode = 1
   })
 
 // add some useful info on help