How to access compiler/compilation/module from loader context in Webpack 4

I am trying to write a custom webpack loader.

Webpack documentation mentions that access to the _compiler, _compilation and _module properties on loader context is deprecated (https://webpack.js.org/api/loaders/#this_compilation) and should be avoided.

Is there a newer API that would allow me to access them?

For anyone trying to figure out the same thing. I don't think there is any replacement API. The idea probably is that a loader shouldn't really need access to these objects and if you do need them you should use a plugin instead (or in addition).

In case the properties will get removed in future, here is how you can "add them back" using a plugin:

// custom-plugin.js
const NormalModule = require('webpack/lib/NormalModule')

class CustomPlugin {
  apply (compiler) {
    compiler.hooks.compilation.tap('CustomPlugin', (compilation) => {
      NormalModule.getCompilationHooks(compilation).loader.tap('CustomPlugin', (loader, module) => {
        loader._customPlugin = {
          module: module,
          compiler: compiler,
          compilation: compilation,
        }
      })
    });
  }
}

module.exports = CustomPlugin

// custom-loader.js
module.exports = function (source) {
  console.log({
    module: this._customPlugin.module === this._module, // true
    compiler: this._customPlugin.compiler === this._compiler, // true
    compilation: this._customPlugin.compilation === this._compilation, // true
  });
  return source;
}