8000 Prod build does not load component library css · Issue #1287 · vuejs/vue-cli · GitHub
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sanchitnevgi opened this issue May 14, 2018 · 21 comments
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Prod build does not load component library css #1287

sanchitnevgi opened this issue May 14, 2018 · 21 comments
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needs reproduction This issue is missing a minimal runnable reproduction, provided by the author

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@sanchitnevgi
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sanchitnevgi commented May 14, 2018 •
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Version

3.0.0-beta.10

Steps to reproduce

I have a component library that exports .vue files styled with .scss. These are consumed in my project as

import { SomeComponent } from "@comp/lib";

Vue.use("some-component", SomeComponent);

Prior to beta.10, the component css would work as expected (Tested on beta.6). Once I've upgraded to beta.10, The Prod build no longer has the component css. A thing I've noticed it the bundled output css has reduced (From a single 30kb file to multiple files NOT totalling to 30kb [~25kb]).

What is expected?

Component css should be present in Prod build

What is actually happening?

Component css is not present in Prod build

Edit:

Reproduction Link:

https://github.com/sanchitgn/comp-css

Some more details: The component library is hosted on an internal npm. It's a repo with a bunch of .vue files.
My guess is, this has to do with webpack 4 (tree-shaking?)
@LinusBorg
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LinusBorg commented May 14, 2018 •
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Please provide a runnable reproduction, as explained in the issue template.

We will repoen when you do so.

@sanchitnevgi
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sanchitnevgi commented May 14, 2018 •
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I don't know how to provide a reproduction for this particular issue. It relies on installing a 3rd party npm component package. The issue seems to be that vue-cli ignores the 3rd party component css. Nonetheless I've added a basic reproduction.
The 3rd party lib exports an index.js file with a .vue file

Edit:

This is the ui library barebones implementation
https://github.com/sanchitgn/comp-lib

@LinusBorg LinusBorg reopened this May 14, 2018
@LinusBorg
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LinusBorg commented May 14, 2018 •
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Thanks for trying to provide a reproduction. A github repository is totally fine.

@yyx990803
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FYI the reproduction is invalid because there's no way for us to install your private components.

@yyx990803 yyx990803 added the needs reproduction This issue is missing a minimal runnable reproduction, provided by the author label May 15, 2018
@yyx990803
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My guess is this has to do with vendor-prefixed rules being removed during the CSS optimization pass - and you didn't include the non-prefixed version of the rules. If that's not the case, please open a new issue with proper, runnable reproductions.

@sanchitnevgi
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sanchitnevgi commented May 15, 2018 •
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Please check the following repo sanchitgn/comp-css. It has no internal dependencies. For some reason webpack wouldn't recognize the module name in main.js so I had to reference the folder directly in node_modules.

I've published a dummy module comp-lib to npm. It does not have any vendor-prefixed code. Just an export of .vue components.

development build works fine. However the production build loses all css.

Edit: FIXED

Seems like the sideEffects: false flag in package.json in the comp library was the issue. Although isn't this a valid use case for sideEffects? Not to mention it worked fine before beta.10

@sanchitnevgi
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The "sideEffects": false flag in big-module's package.json indicates that the package's modules have no side effects (on evaluation) and only expose exports. This al 8000 lows tools like webpack to optimize re-exports. In the case import { a, b } from "big-module-with-flag" is rewritten to import { a } from "big-module-with-flag/a"; import { b } from "big-module-with-flag/b".

The example contains two variants of big-module. big-module has no sideEffects flag and big-module-with-flag has the sideEffects flag. The example client imports a and b from each of the variants.

After being built by webpack, the output bundle contains index.js a.js b.js c.js from big-module, but only a.js and b.js from big-module-with-flag.

https://github.com/webpack/webpack/tree/master/examples/side-effects

Possibly related: webpack/webpack#6741

@edmorley edmorley mentioned this issue Oct 2, 2018
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@ZTrainWilliams
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vue_cli3.0.5,The "sideEffects": false in package.json.After build, all CSS is lost, including <style> written in App.vue.

@leafiy
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leafiy commented Oct 30, 2018 •
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vue_cli3.0.5,The "sideEffects": false in package.json.After build, all CSS is lost, including <style> written in App.vue.

add css: { extract: false } to vue.config.js
maybe a bug?

@san-kumar
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add css: { extract: false } to vue.config.js
maybe a bug?

I was going crazy too why this isn't working. Adding this line fixed it. Thanks!

@joaoeudes7
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Nothing changed? Is this still the solution? The size grows considerably with this solution

@LinusBorg
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sideEffects: ['*.css']

You can find more information in the webpack documentation about this feature. It's not related to Vue CLI.

@joaoeudes7
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Thanks

@efstajas
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Hey, super sorry to reopen this thread — I think I have the same problem and I'm a bit stuck even after trying everything explained here.

This is my library repo: https://github.com/bingo-bango-corp/simsalabim-design

I set css: { extract: false } there initially, and everything works fine. I can import components from the package and styles are there. However, now, we're setting up some pages in nuxt, and that approach won't work there because applying the inlined styles obviously causes a document is undefined error. We could disable server side rendering for these components of course, but it would kind of defeat the purpose of using nuxt in the first place as lots and lots of components will be coming from the above bundle.

So, now, when I put "sideEffects": ["*.css"] in package.json, I don't get a css file at all in dist, even with extract specifically set to true in vue.config.js. Meaning — nuxt doesn't crash on render, but there's also no styles. Setting sideEffects: false of course results in no styles either.

I think I might just be dumb, in this case, sorry, but I'm a bit lost here.

@LinusBorg
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Just remove the sideEffects flag, it won't have any positive effect on the bundled code as we pack won't be able to treeshake anything anyway.

Unless your package is also consumable unpackaged source.

@efstajas
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efstajas commented Jun 2, 2019

Thanks for the response! When I remove the sideEffects flag and set extract to true, I get a CSS file but the styles aren't being displayed. With no sideEffects flag and extract set to false, I get styles embedded in the bundle, which works fine for a normal Vue app but does not support server side rendering in Nuxt. For now I'm using my library as client-side only in nuxt, which of course works, but since I'm planning to extract a lot of components to my library I'd really like to find a way to render these on the server.

@LinusBorg
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but the styles aren't being displayed.

Did you import the css file into your nuxt app?

@morficus
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@efstajas - did you ever figure this out? I'm running in to the same issue with Nuxt.

@LobotheStark
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vue_cli3.0.5,The "sideEffects": false in package.json.After build, all CSS is lost, including <style> written in App.vue.

add css: { extract: false } to vue.config.js
maybe a bug?

T H A N K S !!!!!

@Aravinda93
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@morficus I am also getting the same issue in my Nuxtjs application. Have you found the solution. If you have some work-around then please provide the same. thanks a lot in advance-

@sanchitnevgi If you have some solution for nuxtjs please provide it.
@leafiy

@naingairitech
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but the styles aren't being displayed.
How about just importing your extracted css file in main.js?

@snyk-bot snyk-bot mentioned this issue Aug 1, 2022
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