friendly-typed-css-modules

friendly-typed-css-modules

This is a fork of Typed-CSS-Modules, aimed at providing some friendlier functionality for using programmatic class names against your typed css, as well as scss parsing support.

Creates TypeScript definition files from CSS Modules .css files.

If you have the following css,

/* styles.css */

@value primary: red;

.myClass {
  color: primary;
}

typed-css-modules creates the following .d.ts files from the above css:

/* styles.css.d.ts */
interface Styles {
  myClass: string,
}
const styles: Styles;
export = styles;

So, you can import CSS modules' class or variable into your TypeScript sources:

/* app.ts */
import * as styles from './styles.css';
console.log(`<div class="${styles.myClass}"></div>`);
console.log(`<div style="color: ${styles.primary}"></div>`);

You can also still programmatically generate accessors without getting errors.

console.log(`<div class="${styles[doSomethingProgrammatic()]}"></div>`);

CLI

npm install -g friendly-typed-css-modules

And exec ftcm <input directory> command. For example, if you have .css files under src directory, exec the following:

ftcm src

this creates *.css.d.ts files under the directory which has original .css file.

(your project root)
- src/
    | myStyle.css
    | myStyle.css.d.ts [created]

output directory

Use -o or --outDir option.

For example:

ftcm -o dist src

(your project root)
- src/
    | myStyle.css
- dist/
    | myStyle.css.d.ts [created]

file name pattern

By the default, this tool searches **/*.css files under <input directory>. If you need to customize glob pattern, you use --pattern or -p option.

ftcm -p src/**/*.icss

watch

With -w or --watch, this CLI watches files in the input directory.

camelize CSS token

With -c or --camelCase, kebab-cased CSS classes(such as .my-class {...}) are exported as camelized TypeScript varibale name(export const myClass: string). See also webpack css-loader's camelCase option.

API

npm install typed-css-modules

import DtsCreator from 'typed-css-modules';
let creator = new DtsCreator();
creator.create('src/style.css').then(content => {
  console.log(content.tokens);          // ['myClass']
  console.log(content.formatted);       // 'class Styles...'
  content.writeFile();                  // writes this content to "src/style.css.d.ts"
});

class DtsCreator

DtsCreator instances process CSS and create TypeScript definitions.

new DtsCreator(option)

You can set the following options:

• option.rootDir: Project root directory(default: process.cwd()).
• option.searchDir: Directory which includes target *.css files(default: './').
• option.outDir: Output directory(default: option.searchDir).
• option.camelCase: Camelize CSS class tokens.
• option.allowGenericStringAccess: Allow access to the styles object via generic string accessors (eg. styles[someVariable];)

create(filepath, contents) => Promise(dtsContent)

Returns DtsContent instance.

• filepath: path of target .css file.
• contents(optional): the CSS content of the filepath. If set, DtsCreator uses the contents instead of the original contents of the filepath.

class DtsContent

DtsContent instances contain *.d.ts content, the final output path, and a function to write to file.

writeFile() => Promise(dtsContent)

Writes the DtsContent instance's content to a file.

• dtsContent: the DtsContent instance itself.

tokens

An array of tokens retrieved from input CSS file. e.g. ['myClass']

contents

An array of members of the styles class for this module. e.g. ['myClass: string;'].

formatted

A string containing TypeScript definitions.

e.g.

export const myClass: string;

messageList

An array of messages containing invalid token information. e.g. ['my-class is not valid TypeScript variable name.'].

outputFilePath

Final output file path.

Remarks

If your input CSS file has any of the following class names, these invalid tokens are not output to .d.ts files.

/* TypeScript reserved word */
.while {
  color: red;
}

/* invalid TypeScript variable */
/* If camelCase option is set, this token will be converted to 'myClass' */
.my-class{
  color: red;
}

/* it's ok */
.myClass {
  color: red;
}

Example

There is a minimum example in this repository example folder. Clone this repository and run cd example; npm i; npm start.

License

This software is released under the MIT License, see LICENSE.txt.