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    TypeScript icon, indicating that this package has built-in type declarations

    0.7.0 • Public • Published

    typed-css-modules github actions npm version

    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 */
    declare const styles: {
      readonly primary: string;
      readonly myClass: string;
    export = styles;

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

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


    npm install -g typed-css-modules

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

    tcm src

    Then, 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:

    tcm -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 can customize glob pattern, you can use --pattern or -p option. Note the quotes around the glob to -p (they are required, so that your shell does not perform the expansion).

    tcm -p 'src/**/*.icss' .


    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).

    You can pass --camelCase dashes to only camelize dashes in the class name. Since version 0.27.1 in the webpack css-loader. This will keep upperCase class names intact, e.g.:

    .SomeComponent {
      height: 10px;


    declare const styles: {
      readonly SomeComponent: string;
    export = styles;

    See also webpack css-loader's camelCase option.

    named exports (enable tree shaking)

    With -e or --namedExports, types are exported as named exports as opposed to default exports. This enables support for the namedExports css-loader feature, required for webpack to tree shake the final CSS (learn more here).

    Use this option in combination with and (if you use style-loader).

    When this option is enabled, the type definition changes to support named exports.

    NOTE: this option enables camelcase by default.

    .SomeComponent {
      height: 10px;

    Standard output:

    declare const styles: {
      readonly SomeComponent: string;
    export = styles;

    Named exports output:

    export const someComponent: string;


    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); // 'export const myClass: string;'
      content.writeFile(); // writes this content to "src/style.css.d.ts"

    class DtsCreator

    DtsCreator instance processes the input CSS and create TypeScript definition contents.

    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.namedExports: Use named exports as opposed to default exports to enable tree shaking. Requires import * as style from './file.module.css'; (default: false)
    • option.EOL: EOL (end of line) for the generated d.ts files. Possible values '\n' or '\r\n'(default: os.EOL).

    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 instance has *.d.ts content, final output path, and function to write file.

    writeFile(postprocessor) => Promise(dtsContent)

    Writes the DtsContent instance's content to a file. Returns the DtsContent instance.

    • postprocessor (optional): a function that takes the formatted definition string and returns a modified string that will be the final content written to the file.

      You could use this, for example, to pass generated definitions through a formatter like Prettier, or to add a comment to the top of generated files:

      dtsContent.writeFile(definition => `// Generated automatically, do not edit\n${definition}`);


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


    An array of TypeScript definition expressions. e.g. ['export const myClass: string;'].


    A string of TypeScript definition expression.


    export const myClass: string;


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


    Final output file path.


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

    /* 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;


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

    Or please see It's a working demonstration of CSS Modules with React and TypeScript.


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


    npm i typed-css-modules@0.7.0





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    • quramy