Import css in node_modules to svelte

问题

I want to use css framework in my svelte project, in this case it was uikit.

I had install it with yarn add uikit

And of course i have to import the css file, with

@import '../node_modules/uikit/dist/css/uikit.min.css"

But that's not work, wherever i'm import that

App.svelte style
Inside global.css
Using tag inside index.html

Is this not available yet?

Or am I should install that with yarn, and after that I have to copy required file to outside node_modules just like [this solution]?(How to add css from node_modules to template.html in Svelte)

I think this is not restriction just for uikit, instead the way we import third party css file in node_modules into svelte app

回答1:

Install the rollup css plugin:

npm install -D rollup-plugin-css-only
Go to rollup.config.js and configure it by adding the installed plugin to the plugin list, with the output param where the value is a css file. Later that file will be created in your public folder and the contents of the original css file will be copied into it:

css({ output: "public/uikit.css" })
Go to index.html and add the link to your file to the head section:
import the original webkit css file into the script tag of your Svelte component:

import "../node_modules/uikit/dist/css/uikit.min.css";

The solution is not mine. All credits go to this guy (circa 6:00 in the video): https://www.youtube.com/watch?v=RBQg89ak_NY

回答2:

Not familiar with UI kit, but from the information provided, it seems to me that you should be importing (using @import) it inside a scss or sass file, not a css file. Using @import in a css file does not get interpreted, but as you can see, just shows up in your browser as a reference to a file in node_modules directory, which is not available to the browser.

Assuming you're using rollup, in order to process scss files, you will likely need to add the svelte-preprocess-sass dependency for rollup to support sass (and scss).

https://github.com/ls-age/svelte-preprocess-sass

回答3:

So if you want to use UIKit I would go look at the information on the homepage.

From HTML markup section in the introduction on UIKit site:

You need to add:

    <link rel="stylesheet" href="css/uikit.min.css" />

to the head of your html file.

So in your case you could point to your node_modules folder like

<link rel="stylesheet" href="../node_modules/uikit/dist/css/uikit.min.css" />

in your template.

回答4:

I had some trouble following Marvelous Walrus's answer, so here's a more explicit version of the same steps.

Rollup is the bundler used by svelte. (You might know webpacker as a bundler).

Step 1: Install the rollup css plugin:

npm install -D rollup-plugin-css-only

Step 2: edit rollup.config.js

you need to import the plugin you just installed at the beginning of rollup.config.js:

import css from "rollup-plugin-css-only";

and farther down in the file you need to find the array of plugins, and add a new on called css. For example I inserted it before the svelte plugin, which looks like this:

  plugins: [
    css({ output: "public/build/extra.css" }),
    svelte({ ...

When rollup does it's thing, it will read all the css-files imported by your components, combine them into one, and write them to public/build/extra.css

Step 3: edit public/index.html

Add the link to the new css file. For me this looked like this:

<link rel="icon" type="image/png" href="/favicon.png" />
<link rel="stylesheet" href="/build/extra.css" />
<link rel="stylesheet" href="/global.css" />
<link rel="stylesheet" href="/build/bundle.css" />

Step 4: profit!

Now you are all set to use css files from your installed npm packages. for example I added bootstrap by

npm install bootstrap

then finding the css files I want to use (they were in /node_modules/bootstrap/dist/css/) and importing them in the beginning of App.svelte:

<script>
  // build/extra.css is fed from css files imported here
  import "../node_modules/bootstrap/dist/css/bootstrap.min.css";
  import "../node_modules/bootstrap/dist/css/bootstrap-grid.min.css";

Open Questions

Rollup does not seem to handle the sourcemaps that are mentioned in bootstrap.min.css and bootstrap-grid.min.css. So when I open the developer tools I get a warning about not being able to load the sourcemaps

来源：https://stackoverflow.com/questions/56483209/import-css-in-node-modules-to-svelte

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