native-federation-tests

Bundler agnostic plugins to share federated components for testing purposes.

It aims to work for both vitest and jest.

Install

npm i -D @module-federation/native-federation-tests

This module provides two plugins:

NativeFederationTestsRemote

This plugin is used to concat the components that will be used in tests.

Configuration

{
    moduleFederationConfig: any; // the same configuration provided to the module federation plugin, it is MANDATORY
    additionalBundlerConfig?: TsupOptions; // additional `tsup` build options that will be merged with the one generated by the plugin, default is {}
    distFolder?: string; // folder used to store the dist, default is './dist'
    testsFolder?: string; // folder where all the files will be stored, default is '@mf-tests'
    deleteTestsFolder?: boolean; // indicate if the concatenated components folder will be deleted when the job completes, default is 'true'
}

Additional configuration

Note that, for Webpack, the plugin automatically inject the devServer.static.directory configuration.
For the other bundlers, you should configure it by yourself.

NativeFederationTestsHost

This plugin is used to download the concatenated components mock that will be used for tests.

Configuration

{
    moduleFederationConfig: any; // the configuration same configuration provided to the module federation plugin, it is MANDATORY
    testsFolder?: string; // folder where all the files have been stored, default is '@mf-tests',
    mocksFolder?: string; // folder where the concatenated files will be stored, default is './__mocks__',
    deleteTestsFolder?: boolean; // indicate if the tests mock folder will be deleted before the job starts, default is 'true'
    maxRetries?: number; // The number of times the plugin will try to download the mocks before failing, default is 3
}

Bundler configuration

// vite.config.ts
import { NativeFederationTestsHost, NativeFederationTestsRemote } from '@module-federation/native-federation-tests/vite';

export default defineConfig({
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
  /* ... */
  server: {
    // This is needed to emulate the devServer.static.directory of WebPack and correctly serve the zip file
    /* ... */
    proxy: {
      '/@mf-types.zip': {
        target: 'http://localhost:3000',
        changeOrigin: true,
        rewrite: () => `/@fs/${process.cwd()}/dist/@mf-types.zip`,
      },
    },
    fs: {
      /* ... */
      allow: ['./dist'],
      /* ... */
    },
  },
});

// rollup.config.js
import { NativeFederationTestsHost, NativeFederationTestsRemote } from '@module-federation/native-federation-tests/rollup';

export default {
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
};

// webpack.config.js
const { NativeFederationTestsHost, NativeFederationTestsRemote } = require('@module-federation/native-federation-tests/webpack');
module.exports = {
  /* ... */
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
};

// esbuild.config.js
import { build } from 'esbuild';
import { NativeFederationTestsHost, NativeFederationTestsRemote } from '@module-federation/native-federation-tests/esbuild';

build({
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
});

// rspack.config.js
const { NativeFederationTestsHost, NativeFederationTestsRemote } = require('@module-federation/native-federation-tests/rspack');

module.exports = {
  /* ... */
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
};

// rolldown.config.js
const { NativeFederationTestsHost, NativeFederationTestsRemote } = require('@module-federation/native-federation-tests/rolldown');

export default {
  /* ... */
  plugins: [
    NativeFederationTestsRemote({
      /* options */
    }),
    NativeFederationTestsHost({
      /* options */
    }),
  ],
};

Examples

To use it in a host module, refer to this example.
To use it in a remote module, refer to this example.