npm package: @jackluson/babel-plugin-styled-components-px2vw
Description: Babel plugin for convert px to vw units of styled-components
Author: jackuson
Latest version: 1.6.1

# babel-plugin-styled-components-px2vw

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English | [中文](README_ZH.md)

[Babel](https://babeljs.io/) plugin for convert `px` to `vw` units of [styled-components](https://www.styled-components.com/).

1. Use [postcss-px-to-viewport](https://github.com/evrone/postcss-px-to-viewport) to process all css text in template strings.
2. Add a runtime `px2vw` function polyfill to process expression embedded in template strings when enable [transformRuntime](#transform-runtime) option.

its inspiration comes from [babel-plugin-styled-components-px2rem](https://github.com/xuyuanxiang/babel-plugin-styled-components-px2rem). Thanks

## Getting Started

### Installation

Add via npm

`$ npm install babel-plugin-styled-components-px2vw --save-dev`

or yarn

`$ yarn add -D babel-plugin-styled-components-px2vw`

### Configuration

babel.config.js:

```javascript
module.exports = {
  plugins: [
    [
      'styled-components-px2vw',
      {
        unitToConvert: 'px',
        unitPrecision: 5,
        minPixelValue: 0,
      },
    ],
  ],
};
```

or .babelrc:

```javascript
{
  "plugins": [
    [
      "styled-components-px2vw",
      {
        "unitToConvert": 'px',
        "unitPrecision": 5,
        "minPixelValue": 0
      }
    ]
  ]
}
```

### Composition

It should be put before [babel-plugin-styled-components](https://github.com/styled-components/babel-plugin-styled-components#readme)

```json
{
  "plugins": ["styled-components-px2vw", "styled-components"]
}
```

see [example](example)

1. `npm install`
2. Typing: `npm test` to run unit tests
3. Typing: `npm run build` to compile `src/index.jsx` to `dist/index-jsx.js`

### Online Demo

click
[react-boilerplate-typescript-mobile](https://jackluson.github.io/react-boilerplate-typescript-mobile/) and toggle device toolbar,see the style of the page,this is source code [repo](https://github.com/jackluson/react-boilerplate-typescript-mobile)

### Options

> The options of the plugin are based on some of the option of [postcss-px-to-viewport](https://github.com/evrone/postcss-px-to-viewport), but not all options properties work, such as `mediaQuery`、`landscape`

| name             |           type            | required | default                                             |                                                                                                                                                                                                                                                                                                       description |
| :--------------- | :-----------------------: | :------: | :-------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| tags             |         string[]          |  false   | ["styled", "css", "createGlobalStyle", "keyframes"] |                                                                                                                                            [styled-components](https://www.styled-components.com/) template literal [tagged](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals) |
| unitToConvert    |          string           |  false   | px                                                  |                                                                                                                                                                                                                                                                                                   unit to convert |
| viewportWidth    |          number           |  false   | 750                                                 |                                                                                                                                                                                                                                                                                        The width of the viewport. |
| unitPrecision    |          number           |  false   | 5                                                   |                                                                                                                                                                                                                                                             The decimal numbers to allow the vw units to grow to. |
| propList         |         string[]          |  false   | ["*"]                                               |                                                                                                                                                          The properties that can change from px to vw. more detail see [postcss-px-to-viewport propList opions](https://github.com/evrone/postcss-px-to-viewport) |
| viewportUnit     |          string           |  false   | vw                                                  |                                                                                                                                                                                                                                                                                                   Expected units. |
| fontViewportUnit |          string           |  false   | vw                                                  |                                                                                                                                                                                                                                                                                          Expected units for font. |
| minPixelValue    |          number           |  false   | 1                                                   |                                                                                                                                                                                                                                                                           Set the minimum pixel value to replace. |
| replace          |          boolean          |  false   | false                                               |                                                                                                                                                                                                                                                         replaces rules containing vw instead of adding fallbacks. |
| exclude          | Regexp or Array of Regexp |  false   | undefined                                           |                                                                                                                                                                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 |  false   | undefined                                           | (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. |
| transformRuntime |          boolean          |  false   | false                                               |                                                                                                                                                                                                                           since 1.1.0，enable transformation of all expressions that embedded in template strings |

## Demo

### Transform Runtime

If enabled `transformRuntime` option, all supported expressions embedded in template strings are processed as follows:

**Note:** Only expression that end with `px` will be processed.

#### FunctionExpression

source code:

```javascript
import styled from 'styled-components';

export const FunctionExpression = styled.button`
  height: ${function (props) {
    return props.height;
  }}px;
`;
```

compiled:

```javascript
import styled from 'styled-components';

export const FunctionExpression = styled.button`
  height: ${(...args) =>
    _px2rem(function (props) {
      return props.height;
    }, ...args)};
`;

function _px2rem(input, ...args) {
  if (typeof input === 'function') return _px2rem(input(...args), ...args);
  var value = typeof input === 'string' ? parseFloat(input) : typeof input === 'number' ? input : 0;
  var pixels = Number.isNaN(value) ? 0 : value;
  if (Math.abs(pixels) < 0) return pixels + 'px';
  var mul = Math.pow(10, 5 + 1);
  return (Math.round(Math.floor(((pixels * 1) / 100) * mul) / 10) * 10) / mul + 'rem';
}
```

#### ArrowFunctionExpression

source code:

```javascript
export const ArrowFunction = styled.input.attrs((props) => ({
  type: 'password',
  size: props.size || '16px',
  width: props.width || 100,
}))`
  color: palevioletred;
  font-size: 14px;
  border: 1px solid palevioletred;
  border-radius: 8px; /* setting propList: ['*', '!border-*'] */
  width: ${(props) => props.width}px; /* PropertyAccess Body */
  height: ${() => height}px; /* Identifier Body */
  line-height: ${() => '44'}px; /* StringLiteral Body */
  margin: ${() => 32}px; /* NumericLiteral Body */
  padding: ${(props) => props.size};
`;

export const ArrowFunctionWithBlockBody = styled.button`
  width: ${(props) => {
    if (props.width) {
      return props.width;
    } else {
      return 0;
    }
  }}px; /* Block Body */

  ${(props) => (props.disabled ? 'height: 400px' : 'height: 200px')}
`;
export const ArrowFunctionWithBinaryBody = styled.button`
  ${(props) =>
    props.disabled &&
    `
      width: 200px;
      font-size: 14px;
    `};
  height: ${(props) => !props.disabled && props.height}px; /* ArrowFunction with a LogicalExpression Body */
  width: ${() => 44 + 50}px; /* ArrowFunction with a BinaryExpression Body */
`;
export const ArrowFunctionWithConditionalBody = styled.button`
  height: ${(props) => (props.height ? height : 100)}px; /* ArrowFunction with a ConditionalExpression Body */
`;
```

compiled:

```javascript
export const ArrowFunction = styled.input.attrs((props) => ({
  type: 'password',
  size: props.size || '16px',
  width: props.width || 100,
}))`
  color: palevioletred;
  font-size: 1.86667vw;
  border: 1px solid palevioletred;
  border-radius: 8px; /* setting propList: ['*', '!border-*'] */
  width: ${(props) => _px2vw(props.width)}; /* PropertyAccess Body */
  height: ${() => _px2vw(height)}; /* Identifier Body */
  line-height: ${() => _px2vw('44')}; /* StringLiteral Body */
  margin: ${() => _px2vw(32)}; /* NumericLiteral Body */
  padding: ${(props) => props.size};
`;

export const ArrowFunctionWithBlockBody = styled.button`
  width: ${(props) =>
    _px2vw(() => {
      if (props.width) {
        return props.width;
      } else {
        return 0;
      }
    })}; /* Block Body */

  ${(props) => (props.disabled ? 'height: 53.33333vw' : 'height: 26.66667vw')}
`;
export const ArrowFunctionWithBinaryBody = styled.button`
  ${(props) =>
    props.disabled &&
    `
      width: 26.66667vw;
      font-size: 1.86667vw;
    `};
  height: ${(props) => _px2vw(!props.disabled && props.height)}; /* ArrowFunction with a LogicalExpression Body */
  width: ${() => _px2vw(44 + 50)}; /* ArrowFunction with a BinaryExpression Body */
`;
export const ArrowFunctionWithConditionalBody = styled.button`
  height: ${(props) =>
    props.height ? _px2vw(height) : _px2vw(100)}; /* ArrowFunction with a ConditionalExpression Body */
`;
```

#### ConditionalExpression

source code

```javascript
export const ConditionalExpression = function ({ fontSize, spacing } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize === 'number' ? fontSize : (props) => props.theme.fontSize}px;
    ${spacing
      ? `
     padding: 8px 16px 0 32px;
     margin: 16px 0;
  `
      : ''}
  `;

  return <StyledButton />;
};
export const ConditionalExpressionWhenTrue = function ({ fontSize } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize !== 'number' ? (props) => props.theme.fontSize : fontSize}px;
  `;

  return <StyledButton />;
};
export const ConditionalExpressionWhenFalse = function ({ fontSize } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize === 'number' ? fontSize : 16}px;
  `;

  return <StyledButton />;
};
```

compiled:

```javascript
export const ConditionalExpression = function ({ fontSize, spacing } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize === 'number' ? _px2vw(fontSize) : (props) => _px2vw(props.theme.fontSize)};
    ${spacing
      ? `
     padding: 1.06667vw 2.13333vw 0 4.26667vw;
     margin: 2.13333vw 0;
  `
      : ''}
  `;
  return /*#__PURE__*/ React.createElement(StyledButton, null);
};
export const ConditionalExpressionWhenTrue = function ({ fontSize } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize !== 'number' ? (props) => _px2vw(props.theme.fontSize) : _px2vw(fontSize)};
  `;
  return /*#__PURE__*/ React.createElement(StyledButton, null);
};
export const ConditionalExpressionWhenFalse = function ({ fontSize } = {}) {
  const StyledButton = styled.button`
    font-size: ${typeof fontSize === 'number' ? _px2vw(fontSize) : _px2vw(16)};
  `;
  return /*#__PURE__*/ React.createElement(StyledButton, null);
};
const condition = false;
```

#### Other Expressions

Identifier, CallExpression, BinaryExpress, StringLiteral, NumericLiteral, MemberExpression, LogicalExpression...

### Disable transformRuntime (default)

If disable transformRuntime option, all supported expressions embedded in template strings are not processed as follows:

<details>
  <summary>
   the input code show as below
  </summary>

```javascript
import styled, { css, createGlobalStyle, keyframes } from 'styled-components';

const mixins = css`
  padding: 0 18px;
  margin: 16px 32px 16px 32em;
  padding-top: 10px;
  padding-bottom: 10px;
  border: 2px solid black;
`;

const Animation = keyframes`
from {
transform: translateX(100px);
}

to {
transform: translateX(-100px);
}
`;

const Input = styled.input.attrs((props) => ({
  type: 'password',
  size: props.size || '1em',
}))`
  color: palevioletred;
  font-size: 14px;
  border: 1px solid palevioletred;
  border-radius: 8px;
  margin: ${(props) => props.size};
  padding: ${(props) => props.size};
`;

const GlobalStyle = createGlobalStyle`
section {
font-size: 16px;
}

html body {
font-size: 18px;
section {
font-size: 16px
}
}
`;

const BlockButton = styled.button`
  ${mixins};
  display: block;
  width: 100%;
  height: 96px;
  line-height: 96px;
`;

const InlineButton = styled.button`
  ${mixins};
  display: inline;
  width: ${(props) => props.width}px;
  height: 96px;
  line-height: 96px;
`;

const ExtendedButton = styled(InlineButton)`
  width: 120px;
  height: 32px;
  line-height: 32px;
  font-size: 14px;
`;

const SizeableButton = styled.button(
  (props) =>
    ` display: inline; width: ${props.width}px; height: ${props.height}px; line-height: ${props.height}px; font-size: 16px;`,
);
```

</details>

<details>
  <summary>
   the output code show as below
  </summary>

```javascript
import styled, { css, createGlobalStyle, keyframes } from 'styled-components';
const mixins = css`
  padding: 0 2.4vw;
  margin: 2.133vw 4.267vw 2.133vw 32em;
  padding-top: 1.333vw;
  padding-bottom: 1.333vw;
  border: 0.267vw solid black;
`;
const Animation = keyframes`
  from {
    transform: translateX(13.333vw);
  }

  to {
    transform: translateX(-13.333vw);
  }
`;
const Input = styled.input.attrs((props) => ({
  type: 'password',
  size: props.size || '1em',
}))`
  color: palevioletred;
  font-size: 1.867vw;
  border: 1px solid palevioletred;
  border-radius: 8px;
  margin: ${(props) => props.size};
  padding: ${(props) => props.size};
`;
const GlobalStyle = createGlobalStyle`
  section {
      font-size: 2.133vw;
  }

  html body {
    font-size: 2.4vw;
    section {
      font-size: 2.133vw
    }
  }
`;
const BlockButton = styled.button`
  ${mixins};
  display: block;
  width: 100%;
  height: 12.8vw;
  line-height: 12.8vw;
`;
const InlineButton = styled.button`
  ${mixins};
  display: inline;
  width: ${(props) => props.width}px;
  height: 12.8vw;
  line-height: 12.8vw;
`;
const ExtendedButton = styled(InlineButton)`
  width: 16vw;
  height: 4.267vw;
  line-height: 4.267vw;
  font-size: 1.867vw;
`;
const SizeableButton = styled.button(
  (props) => `
  display: inline;
  width: ${props.width}px;
  height: ${props.height}px;
  line-height: ${props.height}px;
  font-size: 2.133vw;
`,
);
```

</details>

### License

This project is licensed under the [MIT License](https://github.com/jackluson/babel-plugin-styled-components-px2vw/blob/master/LICENSE).