--modern flag does't work when config prefetch's fileBlackList in chainWebpack.

[heguichuan]

Version

3.0.5

Reproduction link

https://github.com/heguichuan/vuecli3-issue

Node and OS info

Node 8.11.3 / Windows 7

Steps to reproduce

1. npm install

2. npm run modern

// i init project with vue-cli3 , just add vue.config.js with something in it.

What is expected?

build successfully.

What is actually happening?

vue-cli-service build --modern

• Building legacy bundle for production... ERROR TypeError: Cannot read property 'fileBlacklist' of undefined
  TypeError: Cannot read property 'fileBlacklist' of undefined
  at config.plugin.tap.options (E:\TEST\vuecli3-issue\vue.config.js:8:45)
  at Object.tap (E:\TEST\vuecli3-issue\node_modules\webpack-chain\src\Plugin.js:24:24)
  at chainWebpack (E:\TEST\vuecli3-issue\vue.config.js:7:31)
  ……

[LinusBorg]

This happens because that plugin is only added for the modern bundle, not the legacy bundle.

https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/lib/config/app.js#L155-L171

You should be able to fix your config like this:

module.exports = {
  chainWebpack: config => {
    if (config.plugins.has('prefetch')) {
      config.plugin('prefetch').tap(options => {
        options[0].fileBlacklist = options[0].fileBlacklist || []
        options[0].fileBlacklist.push(/myasyncRoute(.)+?/)
        return options
      })
    }
  }
}

[heguichuan]

This happens because that plugin is only added for the modern bundle, not the legacy bundle.

https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/lib/config/app.js#L155-L171

You should be able to fix your config like this:

module.exports = {
  chainWebpack: config => {
    if (config.plugins.has('prefetch')) {
      config.plugin('prefetch').tap(options => {
        options[0].fileBlacklist = options[0].fileBlacklist || []
        options[0].fileBlacklist.push(/myasyncRoute(.)+?/)
        return options
      })
    }
  }
}

done it!, Thanks!