What steps are necessary to develop a webpack loader that allows access to all sources through a single function?

Question

What steps are necessary to develop a webpack loader that allows access to all sources through a single function?

Is there a way to create a custom loader that extracts all CSS sources and retrieves their contents in a function? For example:

Webpack configuration

module: {
  loaders: [
    {test: /\.css$/, loader: 'my-loader'}
  ]
}

File A (foo.js)

import './foo.css';

File B (bar.js)

import './bar.css';

File C (app.js)

import './app.css';
import getAllCSSContents from 'my-loader';

const css = getAllCSSContents();

The function getAllCSSContents would extract the contents of foo.css, bar.css, and app.css.

javascript webpack

Answer 1

Answer №1

Creating a custom loader can be a bit challenging in this scenario because the loader needs to have knowledge of all CSS modules beforehand to generate the necessary code, which goes against the concept of loaders being pure functions that transform individual input modules.

However, you can somewhat achieve your desired outcome by utilizing tools like raw-loader and require.context. Here's an example:

// Load all CSS files within the current directory and its subdirectories
const context = require.context('!raw-loader!./', true, /\.css$/);
const cssFiles = {};

for (let filename of context.keys()) {
  cssFiles[filename] = context(filename);
}

Answer 2

Creating a custom loader can be a bit challenging in this scenario because the loader needs to have knowledge of all CSS modules beforehand to generate the necessary code, which goes against the concept of loaders being pure functions that transform individual input modules.

However, you can somewhat achieve your desired outcome by utilizing tools like raw-loader and require.context. Here's an example:

// Load all CSS files within the current directory and its subdirectories
const context = require.context('!raw-loader!./', true, /\.css$/);
const cssFiles = {};

for (let filename of context.keys()) {
  cssFiles[filename] = context(filename);
}

What steps are necessary to develop a webpack loader that allows access to all sources through a single function?

Answer №1

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