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postcss-filter-plugins

Exclude/warn on duplicated PostCSS plugins.

postcss-filter-plugins Build Status

Exclude/warn on duplicated PostCSS plugins.

Install

With npm do:

$ npm install postcss-filter-plugins --save

Example

Note that this plugin does not actually transform your CSS; instead, it ensures that plugins in the PostCSS instance are not duplicated. It is intended to be used by plugin packs such as cssnano or cssnext.

var counter = postcss.plugin('counter', function () {
    return function (css) {
        css.eachDecl('foo', function (decl) {
            let value = parseInt(decl.value, 10);
            value += 1;
            decl.value = String(value);
        });
    }
});
 
var css = 'h1 { foo: 1 }';
var out = postcss([
    filter(),
    counter(),
    counter()
]).process(css).css;
 
console.log(out);
// => h1 { foo: 2 } 
// Note that you will get a PostCSS warning in the message registry 

API

filterPlugins([options])

options

direction

Type: string
Default: 'both'

Pass 'forward', 'backward', or 'both' to customise the direction in which the plugin will look in the plugins array. See the tests for examples on how this works.

postcss([ filter({
    direction: 'forward'
}) ]).process(css).css);
exclude

Type: array
Default: [] (empty)

Plugins that should be excluded from the filter. Pass an array of plugin names.

postcss([ filter({
    exclude: ['postcss-cssstats']
}) ]).process(css).css);
silent

Type: boolean
Default: false

Set this to true to disable the plugin from emitting any PostCSS warnings.

postcss([ filter({
    silent: true
}) ]).process(css).css);
template

Type: function
Default: format function

This function will be passed each PostCSS plugin object. You are expected to return a string from each call, which is then used to warn the user about her duplicated plugins.

postcss([ filter({
    template: function (plugin) {
        return 'Duplicate plugin found: ' + plugin.postcssPlugin;
    }
}) ]).process(css).css);

Usage

See the PostCSS documentation for examples for your environment.

Contributors

Thanks goes to these wonderful people (emoji key):


Ben Briggs

💻 📖 👀 ⚠️

Maxime Thirouin

📖

Andreas Lind

💻

This project follows the all-contributors specification. Contributions of any kind welcome!

License

MIT © Ben Briggs