Getting Started

Installation

$ pnpm add -D @zccm/postcss-px-to-viewport

Usage

Default Options:

{
  unitToConvert: 'px',
  viewportWidth: 320,
  unitPrecision: 5,
  propList: ['*'],
  viewportUnit: 'vw',
  fontViewportUnit: 'vw',
  selectorBlackList: [],
  minPixelValue: 1,
  mediaQuery: false,
  replace: true,
  exclude: undefined,
  include: undefined,
  landscape: false,
  landscapeUnit: 'vw',
  landscapeWidth: 568
}

• unitToConvert (String) unit to convert, by default, it is px.
• viewportWidth (Number) The width of the viewport | (fileName: string) => number.
• unitPrecision (Number) The decimal numbers to allow the vw units to grow to.
• propList (Array) The properties that can change from px to vw.
  • Values need to be exact matches.
  • Use wildcard * to enable all properties. Example: ['*']
  • Use * at the start or end of a word. (['position'] will match background-position-y)
  • Use ! to not match a property. Example: ['*', '!letter-spacing']
  • Combine the "not" prefix with the other prefixes. Example: ['', '!font']
• viewportUnit (String) Expected units.
• fontViewportUnit (String) Expected units for font.
• selectorBlackList (Array) The selectors to ignore and leave as px.
  • If value is string, it checks to see if selector contains the string.
    • ['body'] will match .body-class
  • If value is regexp, it checks to see if the selector matches the regexp.
    • [/^body$/] will match body but not .body
• minPixelValue (Number) Set the minimum pixel value to replace.
• mediaQuery (Boolean) Allow px to be converted in media queries.
• replace (Boolean) replaces rules containing vw instead of adding fallbacks.
• exclude (Regexp or Array of Regexp) Ignore some files like 'node_modules'
  • If value is regexp, will ignore the matches files.
  • If value is array, the elements of the array are regexp.
• include (Regexp or Array of Regexp) If include is set, only matching files will be converted, for example, only files under src/mobile/ (include: /\/src\/mobile\//)
  • If the value is regexp, the matching file will be included, otherwise it will be excluded.
  • If value is array, the elements of the array are regexp.
• landscape (Boolean) Adds @media (orientation: landscape) with values converted via landscapeWidth.
• landscapeUnit (String) Expected unit for landscape option
• landscapeWidth (Number) Viewport width for landscape orientation.

exclude and include can be set together, and the intersection of the two rules will be taken.

Ignoring

You can use special comments for ignore conversion of single lines:

• /* px-to-viewport-ignore-next */ — on a separate line, prevents conversion on the next line.
• /* px-to-viewport-ignore */ — after the property on the right, prevents conversion on the same line.

Example:

/* example input: */
.class {
  /* px-to-viewport-ignore-next */
  width: 10px;
  padding: 10px;
  height: 10px; /* px-to-viewport-ignore */
  border: solid 2px #000; /* px-to-viewport-ignore */
}

/* example output: */
.class {
  width: 10px;
  padding: 3.125vw;
  height: 10px;
  border: solid 2px #000;
}

There are several more reasons why your pixels may not convert, the following options may affect this: propList, selectorBlackList, minPixelValue, mediaQuery, exclude, include.

Use with PostCss configuration file

add to your postcss.config.js

module.exports = {
  plugins: {
    // ...
    '@zccm/postcss-px-to-viewport': {
      // options
    }
  }
}

Use with gulp-postcss

add to your gulpfile.js:

const gulp = require('gulp');
const postcss = require('gulp-postcss');
const pxtoviewport = require('postcss-px-to-viewport');

gulp.task('css', function () {

  const processors = [
    pxtoviewport({
      viewportWidth: 320,
      viewportUnit: 'vmin'
    })
  ];

  return gulp.src(['build/css/**/*.css'])
    .pipe(postcss(processors))
    .pipe(gulp.dest('build/css'));
});