This comes with restrictions to the size and contents of CSS. This package provides a binary to compile SCSS files only if the resulting CSS is valid for AMP. Also it provides a way to insert CSS into a (static) HTML page.
npm install --save-dev amp-css
or if you're using Yarn:
yarn add --dev amp-css
Compile SCSS to CSS
The following example will compile the file
path/to/my/scss/style.scss into the CSS file
if there is no invalid CSS inside and the file size does not exceed AMP's size limit.
amp-css process path/to/my/scss/style.scss path/to/my/css/style.css
Alternatively you can also set an output directory. The following line does exactly the same as the line above:
amp-css process --output-dir path/to/my/css path/to/my/scss/style.scss
Inserting CSS into a HTML file
AMP requires websites to embed the stylings using inline CSS. There is a command that will look for the "Custom AMP CSS" area in a HTML file and overwrite its contents with the content of a given CSS file.
amp-css assign -s mycss.css index.html
Using in build scripts
We recommend defining scripts inside your projects package.json:
In the example above calling
npm run-script build (or
yarn build) will compile the CSS file and insert it into the index.html file.
Processing multiple files
There currently is no support for compiling multiple SCSS files or inserting multiple CSS files. I currently don't see a use case for that.
If your stylings consists of multiple stylings,
@import them all in one SCSS file which you then compile.