Sass2Ts

Bridge Sass & JS! Easily exporting Sass variables and parser them to typed typescript variables for better DX.

Table of content

• Installation
• Usage
  • Export values in Sass
  • Generate types
  • Use values in TypeScript
• sass2ts.config.js
• Options

Installation

Install the package as a dependency:

# NPM
$ npm install -D @chore-dev/sass2ts

# PNPM
$ pnpm add -D @chore-dev/sass2ts

# Yarn
$ yarn add -D @chore-dev/sass2ts

Usage

Export values in Sass

According to Sass Doc, there are total 8 data types in Sass:

No need to stringify before exporting:

• Numbers
• Strings
• Colors
• boolean

Need to stringify before exporting:

• List of values
• null
• Maps
• Function references

Notice that error will be thrown if you try to export a data type that need to be stringify

Below is an example of how to export values in Sass:

// variables.module.scss

@use 'sass:meta';
@use '@chore-dev/sass2ts/stringifier' as sass2ts;

@function function-example() {
  @return 'this is a example function';
}

:export {
  number-example                  : 1;
  number-quoted-example           : '1';
  number-with-unit-example        : 1px;
  number-with-unit-quoted-example : '1px';
  string-example                  : i-go-to-school-by-bus;
  string-quoted-example           : 'I go to school by bus';
  color-hex-example               : #000000;
  color-hex-quoted-example        : '#000000';
  color-hsl-example               : hsl(0, 0%, 0%);
  color-hsl-quoted-example        : 'hsl(0, 0%, 0%)';
  color-rgb-example               : rgb(0, 0, 0);
  color-rgb-quoted-example        : 'rgb(0, 0, 0)';
  boolean-true-example            : true;
  boolean-true-quoted-example     : 'true';
  boolean-false-example           : false;
  boolean-false-quoted-example    : 'false';
  list-example                    : sass2ts.stringifier((1, i-go-to-school-by-bus, #000000, true, (1, 2, 3, 4, 5), null, (foo: bar), meta.get-function(function-example)));
  null-example                    : sass2ts.stringifier(null);
  map-example                     : sass2ts.stringifier((
    numebr: 1,
    string: i-go-to-school-by-bus,
    color: #000000,
    boolean: true,
    list: (1, 2, 3, 4, 5),
    null: null,
    map: (foo: bar),
    function-example : meta.get-function(function-example)
  ));
  function-example                : sass2ts.stringifier(meta.get-function(function-example));
}

Generate types

1. Add the following script to your package.json file

You may skip this step if you are using PNPM or Yarn

{
  ...
  "scripts": {
    // ...existing scripts
    "sass2ts": "sass2ts"
  },
  ...
}

2. Create a config file at the project root directory named sass2ts.config.js

NOTE: Read the sass2ts.config.js section for more information

/** @type {import("@chore-dev/sass2ts/parser/types").Sass2TsConfig} */

const config = [
  {
    implementGetter: true,
    input: './path/to/variables.module.scss',
    output: 'fooBar', // No extension needed
    outputDir: './path/of/output/dir',
    preserveString: false,
    rootName: 'FooBar'
  }
];

• If "type": "module" in package.json

export default config;

• If no "type": "module" in package.json

module.exports = config;

3. Run the following command to start the Sass2Ts:

NOTE: Read the Options section for more information

# NPM
$ npm run sass2ts [<options>]

# PNPM
$ pnpm sass2ts [<options>]
or # If you have added the script to your `package.json` file
$ pnpm run sass2ts [<options>]

# Yarn
$ yarn sass2ts [<options>]
or # If you have added the script to your `package.json` file
$ yarn run sass2ts [<options>]

Use values in TypeScript

// somewhere.ts

import { getFooBar } from './path/of/output/dir/fooBar';

const fooBar = getFooBar();

// Do something with fooBar...

sass2ts.config.js

The following are options that can be used in the sass2ts.config.js file:

Option	Type	Optional	Default	Description
implementGetter	boolean	Y	true	Include a get function in the output file to direct access the exported variables
input	string			The source sass export file
output	string	Y	Same as the input file	The name of the output file without extension
outputDir	string			The output directory of the output file
preserveString	boolean	Y	false	Should Sass2Ts try its best to convert values to the type it should be
rootName	string	Y	SassVariables	The name of the exporting interface

Options

The following are options that can be used in the command line:

Option	Alias	Description	Example
--config path::string	-C path::string	Use a config file which is not located at the project root directory or not named as sass2ts.config.ts	--config ./foo/bar/sass2ts.config.js