# fig-pxtorem

**Repository Path**: shudong/fig-pxtorem

## Basic Information

- **Project Name**: fig-pxtorem
- **Description**: postcss-pxtorem-x
- **Primary Language**: JavaScript
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-10-28
- **Last Updated**: 2020-12-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

## Install

```shell
$ yarn add fig-pxtorem -S
```

## Usage

* inclue files

## config include exclude

- `inclue` (Array)  inclue files, use: must absolute path ['/path/a','/path/b'].

```
const path = require('path');
const fs = require('fs');

const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
module.exports = {
  plugins: [
    require('postcss-flexbugs-fixes'),
    require('postcss-preset-env')({
      autoprefixer: {
        flexbox: 'no-2009'
      },
      stage: 3
    }),
    require('fig-pxtorem')({
      rootValue: 16,
      unitPrecision: 5,
      mediaQuery: false,
      minPixelValue: 0,
      include: [resolveApp('/src/pages/m'), resolveApp('/src/xxx/m')],
      propList: [
        '*background*',
        '*padding*',
        '*margin*',
        'letter-spacing',
        '*width',
        '*height',
        'left',
        'font*',
        'right',
        'top',
        'bottom'
      ]
    })
    // require('antd-mobile')({
    //   style: "css"
    // })
  ]
};

```

### Input/Output

*With the default settings, only font related properties are targeted.*

```css
// input
h1 {
    margin: 0 0 20px;
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: 1px;
}

// output
h1 {
    margin: 0 0 20px;
    font-size: 2rem;
    line-height: 1.2;
    letter-spacing: 0.0625rem;
}
```

### Example

```js
var fs = require('fs');
var postcss = require('postcss');
var pxtorem = require('postcss-pxtorem-x');
var css = fs.readFileSync('main.css', 'utf8');
var options = {
    replace: false
};
var processedCss = postcss(pxtorem(options)).process(css).css;

fs.writeFile('main-rem.css', processedCss, function (err) {
  if (err) {
    throw err;
  }
  console.log('Rem file written.');
});
```

### options

Type: `Object | Null`  
Default:
```js
{
    rootValue: 16,
    unitPrecision: 5,
    propList: ['font', 'font-size', 'line-height', 'letter-spacing'],
    selectorBlackList: [],
    replace: true,
    mediaQuery: false,
    minPixelValue: 0,
    exclude: ['/path/a','/path/b'],
    include: ['/path/a','/path/b']
}
```

- `rootValue` (Number) The root element font size.
- `unitPrecision` (Number) The decimal numbers to allow the REM units to grow to.
- `propList` (Array) The properties that can change from px to rem.
    - 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*']` 
- `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`
- `replace` (Boolean) replaces rules containing rems instead of adding fallbacks.
- `mediaQuery` (Boolean) Allow px to be converted in media queries.
- `minPixelValue` (Number) Set the minimum pixel value to replace.
- `inclue` (Array)  inclue files, use: must absolute path ['/path/a','/path/b'].
### Use with gulp-postcss and autoprefixer

```js
var gulp = require('gulp');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var pxtorem = require('postcss-pxtorem-x');

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

    var processors = [
        autoprefixer({
            browsers: 'last 1 version'
        }),
        pxtorem({
            replace: false
        })
    ];

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

### A message about ignoring properties
Currently, the easiest way to have a single property ignored is to use a capital in the pixel unit declaration.

```css
// `px` is converted to `rem`
.convert {
    font-size: 16px; // converted to 1rem
}

// `Px` or `PX` is ignored by `postcss-pxtorem-x` but still accepted by browsers
.ignore {
    border: 1Px solid; // ignored
    border-width: 2PX; // ignored
}
```