scss-variable

Generate css variables fro different css pre-processors. Mainly target for scss/sass.

Installation

npm i -D scss-variable
#or
yarn add -D scss-variable

Usage

Assume you have a varaible.js looks like this

module.exports = {
  ns: {
    property: {
      a: "#fff",
      b: "#ccc"
    }
  }
};

Create another scss-variable.js

const path = require("path");
const generateVariable = require("scss-variable");

generateVariable({
  src: path.resolve(__dirname, "path/to/variable.js"),
  dest: path.resolve(__dirname, "path/to/variable.scss")
});

Then run node scss-variable;

Output will look like this

// variable.scss
$ns-property-a: #fff;
$ns-property-b: #ccc;

Advanced usage

Scss map

// in your variable.js
module.exports = {
  _map_: {
    ns: {
      case: {
        "font-size": "12px"
      }
    }
  }
};

Run node scss-variable

Output will look like this

$ns: (
  case: (
    font-size: 12px
  )
);

To use !default

module.exports = {
  _map_: {
    ns: {
      default: true,
      case: {
        "font-size": "12px"
      }
    }
  }
};

Output will look like this

$ns: (
  case: (
    font-size: 12px
  )
) !default;

map will be emitted after variables

You can refer to your variables in your map

Merge

override is used to provide a new object to merge with src

const path = require("path");
const generateVariable = require("scss-variable");

generateVariable({
  src: path.resolve(__dirname, "path/to/variable.js"),
  dest: path.resolve(__dirname, "path/to/variable.scss"),
  override: {
    property: "value"
  }
});

You can merge variables as well as scss map

// in variable.js
module.exports = {
  a: {
    p: "black"
  },
  _map_: {
    ns: {
      case: {
        "font-size": "12px"
      }
    }
  }
};

// in your external override related js
module.exports = {
  a: {
    p: "red"
  },
  _map_: {
    ns: {
      case: {
        "font-size": "14px"
      }
    }
  }
};

// in scss-variable.js
generateVariable({
  src: path.resolve(__dirname, "path/to/variable.js"),
  dest: path.resolve(__dirname, "path/to/variable.scss"),
  override: require("path/to/override/related/js")
});

Output will be:

$a-p: red;
$ns: (
  case: (
    font-size: 12px
  )
);

Viola!

In case you do not like nesting, flatten property key or even flatten map expression are supported

The case above can be rewritten as following

// in your external override related js
module.exports = {
  "a-p": "red",
  "ns.case": {
    "font-size": "14px"
  }
};

Configuration

src

Source of your variable

dest

Where to emit your file. File extension is needed!

In other word, less or other syntax are possible and actually supported

[override]

Object to override your src

[prefix]

Default: '

String to use to prefix the variable (and map) assignment

Basically works like this

`${prefix}${propertyName}`;

'@' for less variables : )

[semi]

Default: true

Whether to add semicolon at the end of variable assignment

[assignToken]

Default: ':'

As the name suggested, used for variable assignment

[separator]

Default: '-'

String used to concat nested property names

`${property}${separator}${property}`;

[mapSeparator]

Default: '.'

When you write map structure as a single property in override (ns.a.b.c)

Only useful for override

// in your variable.js

module.exports = {
  _map_: {
    ns: {
      a: {
        b: {
          "font-size": "12px"
        }
      }
    }
  }
};

In your override, you can refer the above map structure as following

`ns${mapSeparator}a${mapSeparator}b`;

[mapKey]

Default: '_map_'

Key to identify map object

Affected to both src and override

[beforeBody]

Default: ''

String inserted before generated content

`${beforeBody}\n${generatedContent}`;

[afterBody]

Default: ''

String inserted after generated content

`${generatedContent}\n${afterBody}`;

[watch]

Default: false

Watch src to recompile.

[merge]

Default: lodash.merge

Dangerous area. Function used to merge src and override

Signature should look like Object.assign

TODO

• watch mode
• cli
• webpack-loader