[Bug report]vuepress unexpected .vue files building

[dousybox]

• I confirm that this is an issue rather than a question.

Bug report

Steps to reproduce

# clone reproduction repo
git clone https://github.com/dousybox/vuepress-unexpected-SFC-building && cd vuepress-unexpected-SFC-building

# install dependencies
npm i

# run docs:build
npm run docs:build

What is expected?

Success! Generated static files in docs.

What is actually happening?

Building error with a long error message:

too long do not paste
see the reproduce repo

In short, it mean that the component can not be found.

Other relevant information

• My VuePress version is higher than 1.0.0-alpha.47, the following is the output of npx vuepress info in my VuePress project:

Environment Info:

  System:
    OS: macOS 10.14.5
    CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
  Binaries:
    Node: 10.14.2 - /usr/local/bin/node
    Yarn: 1.12.3 - /usr/local/bin/yarn
    npm: 6.9.0 - /usr/local/bin/npm
  Browsers:
    Chrome: 75.0.3770.80
    Firefox: Not Found
    Safari: 12.1.1
  npmPackages:
    @vuepress/core:  1.0.1 
    @vuepress/theme-default:  1.0.1 
    vuepress: ^1.0.1 => 1.0.1 
  npmGlobalPackages:
    vuepress: Not Found

This problem is only repetition in vuepress-1.x.

Every thing is ok in vuepress-0.x, you can checkout the 0.14.11 branch of reproduction repo.

The problem is that vuepress trying to build an irrelevant vue component.
this only repetition in build mode, it's ok in dev mode.

[dousybox]

This bug is fixed in #1705。
Using the siteConfig.patterns=[**/*.md] can make the build process work properly.