PostCSS Functional CSS

PostCSS Functional CSS is PostCSS Plugin that will help to generate functional css.

Why

Why not? Just for fun! Because it's possible with PostCSS. Because it's hype. Just because.

Main reason why I decided to create this plugin is because with it's help I would like to create functional css faster. At the same time I would like to have ability to adjust css anytime with ease and individually for each project.

Getting Started

npm i postcss postcss-functional-css

const config = require('postcss-functional-css-config');

postcss([
  require('postcss-functional-css')(config)
])

Config Example:

module.exports = {
  globalStyles: true,
  cssModules: false,
  mediaQueries: [
    {
      prefix: 'sm',
      prefixSeparator: '-',
      params: '(min-width: 480px)'
    },
    {
      prefix: 'md',
      prefixSeparator: '-',
      params: '(min-width: 640px)'
    },
    {
      prefix: 'lg',
      prefixSeparator: '-',
      params: '(min-width: 960px)'
    },
    {
      prefix: 'xl',
      prefixSeparator: '-',
      params: '(min-width: 1280px)'
    }
  ],
  features: {
    alignContent: {
      className: 'content'
    },
    alignItems: {
      className: 'items'
    },
    alignSelf: {
      className: 'self'
    },
    display: {
      className: 'd'
    },
    flex: {
      className: 'flex'
    },
    flexDirection: {
      className: 'direction'
    },
    flexWrap: {
      className: 'flex'
    },
    float: {
      className: 'float'
    },
    fontSize: {
      className: 'fs',
      values: [12, 14, 16, 18, 24, 32, 48],
      unit: 'px'
    },
    fontWeight: {
      className: 'fw',
      values: [400, 500, 600, 700]
    },
    lineHeight: {
      className: 'ln',
      values: [16, 18, 20, 22, 28, 36, 52],
      unit: 'px'
    },
    height: {
      className: 'h',
      values: ['auto', 4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
      unit: 'px'
    },
    justifyContent: {
      className: 'justify'
    },
    margin: {
      all: {
        className: 'm',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      x: {
        className: 'mx',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      y: {
        className: 'my',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      top: {
        className: 'mt',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      right: {
        className: 'mr',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      bottom: {
        className: 'mb',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      left: {
        className: 'ml',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      }
    },
    minHeight: {
      className: 'minh',
      values: [0, 4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
      unit: 'px'
    },
    maxHeight: {
      className: 'maxh',
      values: [0, 4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
      unit: 'px'
    },
    objectFit: {
      className: 'object-fit'
    },
    opacity: {
      className: 'o',
      increment: 10
    },
    padding: {
      all: {
        className: 'p',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      x: {
        className: 'px',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      y: {
        className: 'py',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      top: {
        className: 'pt',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      right: {
        className: 'pr',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      bottom: {
        className: 'pb',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      },
      left: {
        className: 'pl',
        values: [4, 8, 12, 16, 20, 24, 28, 36, 48, 72, 96, 120],
        unit: 'px'
      }
    },
    position: {
      className: 'position'
    },
    textAlignment: {
      className: 'text-alignment'
    },
    textSize: {
      className: 'fs',
      fontSizeUnit: 'px',
      lineHeightUnit: 'px',
      values: [
        {
          fontSize: 14,
          lineHeight: 20
        },
        {
          fontSize: 18,
          lineHeight: 24
        }
      ]
    },
    textTransform: {
      className: 'text-transform'
    },
    visibility: true,
    zIndex: {
      className: 'z',
      increment: 1,
      limit: 10
    }
  }
};

Add comment to your css file:

/* postcss-functional-css */

Split CSS

It's possible to split css by adding comments for a specific feature:

/* postcss-functional-css-align-content */
/* postcss-functional-css-align-items */
/* postcss-functional-css-align-self */
/* postcss-functional-css-display */
/* postcss-functional-css-flex */
/* postcss-functional-css-flex-direction */
/* postcss-functional-css-flex-wrap */
/* postcss-functional-css-float */
/* postcss-functional-css-font-size */
/* postcss-functional-css-font-weight */
/* postcss-functional-css-line-height */
/* postcss-functional-css-height */
/* postcss-functional-css-justify-content */
/* postcss-functional-css-max-height */
/* postcss-functional-css-min-height */
/* postcss-functional-css-object-fit */
/* postcss-functional-css-opacity */
/* postcss-functional-css-padding */
/* postcss-functional-css-position */
/* postcss-functional-css-text-alignment */
/* postcss-functional-css-text-size */
/* postcss-functional-css-text-transform */
/* postcss-functional-css-visibility */
/* postcss-functional-css-z-index */

Config

globalStyle - enable/disable global styles.

cssModules - generates class names compatible with css modules

mediaQueries - a list of media queries.

mediaQuery.prefix - current media query's prefix that will be added to the class name. mediaQuery.prefixSeparator - separator between media query prefix and feature class name. mediaQuery.params - media query params (valid css media query value).

features[any] - (Boolean | Object). features[any].className - (String) specify custom base class name. If not defined default base class name will be generated - .display-none { display: none; }. If empty, base class name won't be generated for example features.display.className = '' - .none { display: none; }.

features[margin|padding][direction].className - (String) specify custom base class name. features[margin|padding][direction].values - (Array) list of desired values. features[margin|padding][direction].unit - (String) unit.

features[fontSize|lineHeight|height|maxHeight|minHeight].className - (String) specify custom base class name. features[fontSize|lineHeight|height|maxHeight|minHeight].values - (Array) list of desired values. features[fontSize|lineHeight|height|maxHeight|minHeight].unit - (String) unit.

features[fontWeight].className - (String) specify custom base class name. features[fontWeight].values - (Array) list of desired values.

features[textSize].className - (String) specify custom base class name. features[textSize].fontSizeUnit - (String) font size custom unit. features[textSize].lineHeightUnit - (String) font size custom unit. features[textSize].values - (Array) array of objects.

features[opacity].className - (String) specify custom base class name. features[opacity].increment - (Number) increment number.

features[zIndex].className - (String) specify custom base class name. features[zIndex].increment - (Number) increment number. features[zIndex].limit - (Number) z-index max value.