Use CSS Modules in React components with Typescript built by webpack

Question

I want to use the css-loader with the \'modules\' option of webpack in a React application written in Typescript. This example was my starting point (they are using Babel, w

Answer 1

I had similar problem. For me, works import:

import '../../../css/tree.css';

Webpack change this like any other normal imports. It change it to

__webpack_require__(id)

One drawback is that you lost control on style variable.

Answer 2

You can use https://github.com/Quramy/typed-css-modules, which creates .d.ts files from CSS Modules .css files. Please see also https://github.com/css-modules/css-modules/issues/61#issuecomment-220684795

Answer 3

1. Declare 'require' as per ts-loader documentation.
2. Use 'require' as generic with < any > type: require< any >("../../../css/tree.css").

*.d.ts file

declare var require: {
   <T>(path: string): T;
   (paths: string[], callback: (...modules: any[]) => void): void;
   ensure: (paths: string[], callback: (require: <T>(path: string) => T) => void) => void;
}; 

*.tsx file with component

const styles = require<any>("../../../css/tree.css");
...
<h3 className={styles.h3}>Components</h3>

I know it was already answered, but I was struggling with it for a while before I realized I need to use generic type specification, without that I wasn't able to access content of CSS file. (I was getting error: Property 'h3' does not exists on type '{}'.)

Answer 4

A bit late to game but you can create a file called tree.css.d.ts in the same folder as tree.css that has this line:

export const h3: string;

and still use the import statement import * as styles from ... and you will still getcode completion and compile time checking.

You can either manage these definition files manually or you could integrate typed-css-modules into your build pipeline (https://github.com/Quramy/typed-css-modules)

Answer 5

import has special meaning to TypeScript. It means that TypeScript will attempt to load and understand the thing being imported. The right way is to define require like you mentioned but then var instead of import:

var styles = require('../../../css/tree.css')`