feat: export registry (#3842)

* feat: registry first iteration

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

* feat: improve webpack auto export loader

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

* chore: remove `compat` API

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

* chore: cleanup

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

---------

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

js-packages/webpack-config/tests/compiler.js

@@ -0,0 +1,48 @@
+import path from 'path';
+import webpack from 'webpack';
+import { createFsFromVolume, Volume } from 'memfs';
+import * as fs from 'fs';
+
+export default (fixture, options = {}) => {
+  const compiler = webpack({
+    context: __dirname,
+    entry: `./${fixture}`,
+    output: {
+      path: path.resolve(__dirname),
+      filename: 'bundle.js',
+    },
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          use: {
+            loader: path.resolve(__dirname, '../src/autoExportLoader.cjs'),
+            options: {
+              ...options,
+              composerPath: '../../composer.json',
+            },
+          },
+        },
+      ],
+    },
+    optimization: {
+      minimize: false,
+      minimizer: [],
+    },
+  });
+
+  compiler.outputFileSystem = createFsFromVolume(new Volume());
+  compiler.outputFileSystem.join = path.join.bind(path);
+
+  return new Promise((resolve, reject) => {
+    compiler.run((err, stats) => {
+      if (err) reject(err);
+      if (stats.hasErrors()) reject(stats.toJson().errors);
+
+      const outputFilepath = path.join(compiler.options.output.path, compiler.options.output.filename);
+      stats.finalOutput = compiler.outputFileSystem.readFileSync(outputFilepath, 'utf-8');
+
+      resolve(stats);
+    });
+  });
+};