Cannot build app (3.0.0-beta.1)

[soanvig]

Version

3.0.0-alpha.13

Reproduction link

https://github.com/soanvig/vue-cli-issue

Steps to reproduce

1. Create application using vue create test-vue (version 3.0.0-beta.1, which is not included in issue creator)
2. Enter application directory cd test-vue
3. Run yarn build

What is expected?

The build finishes.

What is actually happening?

Building for production...buffer.js:202
  throw new TypeError(kFromErrorMsg);
  ^

TypeError: First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.
    at Function.Buffer.from (buffer.js:202:9)
    at new Buffer (buffer.js:158:17)
    at writeOut (/mnt/pliki/Repos/test-vue/node_modules/webpack/lib/Compiler.js:334:17)
    at require.forEach (/mnt/pliki/Repos/test-vue/node_modules/webpack/lib/Compiler.js:345:12)
    at /mnt/pliki/Repos/test-vue/node_modules/async/dist/async.js:3096:16
    at eachOfArrayLike (/mnt/pliki/Repos/test-vue/node_modules/async/dist/async.js:1055:9)
    at eachOf (/mnt/pliki/Repos/test-vue/node_modules/async/dist/async.js:1103:5)
    at Object.eachLimit (/mnt/pliki/Repos/test-vue/node_modules/async/dist/async.js:3158:5)
    at emitFiles (/mnt/pliki/Repos/test-vue/node_modules/webpack/lib/Compiler.js:315:21)
    at /mnt/pliki/Repos/test-vue/node_modules/mkdirp/index.js:30:20
    at FSReqWrap.oncomplete (fs.js:135:15)
error An unexpected error occurred: "Command failed.\nExit code: 1\nCommand: sh\nArguments: -c vue-cli-service build\nDirectory: /mnt/pliki/Repos/test-vue\nOutput:\n".
info If you think this is a bug, please open a bug report with the information provided in "/mnt/pliki/Repos/test-vue/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

---

From yarn-error.log:

Yarn version: 
  1.4.0
Node version: 
  8.9.4
Platform: 
  linux x64

Exactly the same error on Windows 7 x64 after yarn install and yarn build

[yyx990803]

This seems to be duplicate of #893 and fixed by #897.