webpack semaphore bug

README.md

webpack semaphore bug

Webpack introduced a semaphore in webpack/webpack#5502 to limit the number of modules that are processed in parallel. This semaphore does not support recursively building modules with .loadModule() in a loader and exits without finishing or displaying an error.

index.js

// index.js

loaded.js

// loaded.js

loader.js

module.exports = function (source) {
  const callback = this.async();
  this.loadModule('./loaded', (err, loaded) => {
    callback(null, source + '\n\n' + loaded);
  });
};

package.json

{
  "dependencies": {
    "webpack": "3.11.0"
  }
}

webpack.config.js

module.exports = {
  entry: './loader.js!./index.js',
  output: {filename: '[name].js'},
  parallelism: 1
}