@nkalinov/mf-manifest-deployment-plugin

Module Federation Manifest Deployment Plugin

Inspired by import-map-deployer, this Webpack plugin will allow you to dynamically load remotes taking their URLs from a manifest JSON file deployed remotely.

This decoupling allows you to switch between different versions much faster as you no longer have hardcoded remotes URLs and you don't need to rebuild/redeploy to ship a new version. All you have to do is update the pointer in the manifest file.

When paired with module-federation-manifest-deployment-override it unlocks great potential. It can improve your developer experience by allowing you to code within the production environment and point only specific micro-frontends to your local machine.

Install

yarn add @nkalinov/mf-manifest-deployment-plugin

Usage

Change your remotes and add to webpack.config.js plugins:

const ModuleFederationDeploymentPlugin = require('@nkalinov/mf-manifest-deployment-plugin');

module.exports = {
  plugins: [
    new ModuleFederationPlugin({
      remotes: {
        'app1': 'manifest app1',
      },
    }),
    new ModuleFederationDeploymentPlugin(options)
  ],
}

Options

Defaults:

{
  defaultEntryName = 'remoteEntry.js',
  key = '__webpack_mf_deployment_manifest__',
  manifestPath = '/manifest.json',
  fallbackOrigin = '', // will inherit the public path origin
}

• key - The window key that will be used to store the manifest.
• manifestPath - Relative path (with leading slash) from the current origin to the manifest.json file.
• fallbackOrigin - Origin that will be used for the fallback requests (defaults to public path origin). Could be absolute or relative path prefixed with / (in which case public path origin will be used).
• fallbackEntryName - Remote entry filename that will be used for the fallback requests.

How does it work

1. Get the manifest from window[key].
2. If it doesn't exist then fetch from new URL(__webpack_public_path__).origin + manifestPath
3. Get app url from manifest - window[key][appkey]
   1. If app key doesn't exist, fallback to ${fallbackOrigin}/${name}/latest/${fallbackEntryName}
4. Load remote container
   1. If loading failed, fallback to '${fallbackOrigin}/${name}/latest/' + fileName

Updating the manifest file

todo