PostCSS Plugin Border 1px

PostCSS plugin to resolve 1px border in mobile app.

.foo {
  border: 1px solid red;
  border-radius: 2px;
}

will be processed to:

@media (-webkit-min-device-pixel-ratio: 1), (min-device-pixel-ratio: 1) {
  .foo:after {
    border: 1px solid red;
    -webkit-border-radius: 2px;
	  border-radius: 2px;
    position: absolute;
    content: ' ';
    top: 0;
    left: 0;
    -webkit-transform-origin: top left;
    transform-origin: top left;
    width: 100%;
    height: 100%;
    -webkit-transform: scale(1);
    transform: scale(1);
    pointer-events: none;
  }
}
  
  
@media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2) {
  .foo:after {
    border: 1px solid red;
    -webkit-border-radius: 4px;
	  border-radius: 4px;
    position: absolute;
    content: ' ';
    top: 0;
    left: 0;
    -webkit-transform-origin: top left;
    transform-origin: top left;
    width: 200%;
    height: 200%;
    -webkit-transform: scale(0.5);
    transform: scale(0.5);
    pointer-events: none;
  }
}
  
  
@media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3) {
  .foo:after {
    border: 1px solid red;
    -webkit-border-radius: 6px;
	  border-radius: 6px;
    position: absolute;
    content: ' ';
    top: 0;
    left: 0;
    -webkit-transform-origin: top left;
    transform-origin: top left;
    width: 300%;
    height: 300%;
    -webkit-transform: scale(0.3333333333333333);
    transform: scale(0.3333333333333333);
    pointer-events: none;
  }
}

.foo {
  position:relative;
}

Usage

Step 1: Install plugin:

npm install --save-dev postcss postcss-plugin-border-1px

Step 2: Check you project for existed PostCSS config: postcss.config.js in the project root, "postcss" section in package.json or postcss in bundle config.

If you do not use PostCSS, add it according to official docs and set this plugin in settings.

Step 3: Add the plugin to plugins list:

module.exports = {
  plugins: [
+   require('postcss-plugin-border-1px'),
    require('autoprefixer')
  ]
}

Options

ignoreCommentText

By default, plugin use no comment to ignore process. You can config your own ignore comment by ignoreCommentText option:

require('postcss-plugin-border-1px')({
  ignoreCommentText: 'your config'
})