Setting markdown is invalid after upgrading to 0.10.0

[quanzaiyu]

Bug report

Version

0.10.0

Steps to reproduce

It is valid to set markdown before the upgrade, and now it is invalid to set markdown.

config.js look like this

module.exports = {
  ...
  markdown: {
    anchor: { permalink: false },
    toc: { includeLevel: [1, 2, 3] },
    config: md => {
      md.use(require('markdown-it-sub'))
      md.use(require('markdown-it-sup'))
      md.use(require('markdown-it-mark'))
      md.use(require('markdown-it-ins'))
      md.use(require('markdown-it-abbr'))
      md.use(require('markdown-it-kbd'))
      ...
    }
  },
  ...
}

https://github.com/quanzaiyu/xiaoyulive-vuepress/blob/master/website/.vuepress/config.js

What is expected?

The markdown-it plug-in should be loaded and effective.

What is actually happening?

The markdown-it plug-in ineffective.

Other relevant information

• Your OS: Windows 10 1709
• Node.js version: v10.1.0
• Browser version: Chrome63
• Is this a global or local install? global
• Which package manager did you use for the install? yarn

[ulivz]

Cannot reproduced at my side:

  "dependencies": {
    "markdown-it-sub": "^1.0.0",
    "vuepress": "^0.10.0"
  }

Config:

  markdown: {
    config: md => {
      md.use(require('markdown-it-sub'))
    }
  },

Input:

# Test 

H~2~0

Output:

Please double confirm for that, thanks.