Cannot read property 'styles' of undefined

[candisecandise]

Version

17.0.0

Reproduction link

Steps to reproduce

I wanted to create a vue project with webpack.
I installed vue@2, version was 2.7.0, but I installed the lastest vue-loader, version was 17.0.0.
Then I ran webpack-dev-server --mode development, I got an error:

ERROR in ./src/App.vue
Module build failed (from ./node_modules/vue-loader/dist/index.js):
TypeError: Cannot read property 'styles' of undefined
    at Object.loader (/Users/admin/xxx/node_modules/vue-loader/dist/index.js:70:34)
 @ ./src/main.js 2:0-28 6:17-20

Is it vue@2 cannot be used with vue-loader@17?

What is actually happening?

My project ran failed.

Thanks~

[vue-bot]

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[bpossolo]

@candisecandise I'm experiencing this same thing as well using

• vue 2.7.0
• vue-loader 16.8.3
• typescript 4.7.4
• sass-loader 11.0.1
• css-loader 5.2.4

I removed my dependency on vue-template-compiler as mentioned in step 2 of the upgrade guide.

here is the relevant part of my webpack config

{
  test: /\.ts$/,
  loader: 'ts-loader',
  exclude: /node_modules/,
  options: {
    appendTsSuffixTo: [/\.vue$/]
  }
},
{
  test: /\.vue$/,
  loader: 'vue-loader'
},
{
  test: /\.scss$/,
  use: [
    'style-loader',
    'css-loader',
    'sass-loader',
  ]
}

I wouldn't recommend using vue-loader 17 because the changelog says it requires vue 3

[bpossolo]

I tried downgrading to some earlier versions of vue-loader:

• 16.8.3
• 16.8.2
• 16.8.1
• 16.8.0
• 16.7.1

none of them work with vue 2.7.0

[bpossolo]

@yyx990803 it appears this issue may actually be valid however it got auto-closed by the bot...

[bpossolo]

@candisecandise I managed to get vue 2.7.0 to work with vue-loader 15.10.0 🎉
I also no longer have explicit dependency on vue-template-compiler in my package.json fwiw

upon closer inspection of the 2.7.0 upgrade guide, I see it explicitly says to use 15.10.0
It might be useful to post somewhere on vue-loader docs that 16 and 17 are for vue 3 if that's the case

[candisecandise]

@candisecandise I managed to get vue 2.7.0 to work with vue-loader 15.10.0 🎉 I also no longer have explicit dependency on vue-template-compiler in my package.json fwiw

upon closer inspection of the 2.7.0 upgrade guide, I see it explicitly says to use 15.10.0 It might be useful to post somewhere on vue-loader docs that 16 and 17 are for vue 3 if that's the case

@bpossolo Thank you so much! You are really attentive~, I didn't think to check the upgrade guide for 2.7.0 at all... May i ask where did you find it? I still couldn't find it...
But as you said, the readme of vue-loader should add some instructions, only vue 3 can support 16 and 17@yyx990803

[bpossolo]

Here is the upgrade guide/post

https://blog.vuejs.org/posts/vue-2-7-naruto.html

i can’t remember if I found it on the VueJS Twitter account or if it was directly on the vue blog.

[candisecandise]

Here is the upgrade guide/post

https://blog.vuejs.org/posts/vue-2-7-naruto.html

i can’t remember if I found it on the VueJS Twitter account or if it was directly on the vue blog.

@bpossolo Got it, thank you again~

[B-o0O]

thank you guys