build: reuse debug bundle builds for minified output

Generate unminified and minified debug bundles from one Rollup build, retaining a separate production build and the existing output plugin order.

Co-Authored-By: GPT-6 <codex@openai.com>

Author: nicohrubec

dev-packages/rollup-utils/bundleHelpers.mjs

@@ -142,9 +142,7 @@ export function makeBaseBundleConfig(options) {
  * @param baseConfig The rollup config shared by the entire package
  * @returns An array of versions of that config
  */
-export function makeBundleConfigVariants(baseConfig, options = {}) {
-  const { variants = BUNDLE_VARIANTS } = options;
-
+export function makeBundleConfigVariants(baseConfig) {
   const includeDebuggingPlugin = makeIsDebugBuildPlugin(true);
   const stripDebuggingPlugin = makeIsDebugBuildPlugin(false);
   const terserPlugin = makeTerserPlugin();
@@ -174,14 +172,22 @@ export function makeBundleConfigVariants(baseConfig, options = {}) {
     },
   };
 
-  return variants.map(variant => {
-    if (!BUNDLE_VARIANTS.includes(variant)) {
-      throw new Error(`Unknown bundle variant requested: ${variant}`);
-    }
-    return deepMerge(baseConfig, variantSpecificConfigMap[variant], {
+  const [debug, production, minifiedDebug] = BUNDLE_VARIANTS.map(variant =>
+    deepMerge(baseConfig, variantSpecificConfigMap[variant], {
       // Merge the plugin arrays and make sure the end result is in the correct order. Everything else can use the
       // default merge strategy.
       customMerge: key => (key === 'plugins' ? mergePlugins : undefined),
-    });
-  });
+    }),
+  );
+
+  const isOutputPlugin = plugin => ['terser', 'license'].includes(plugin.name);
+
+  debug.output = [debug, minifiedDebug].map(config => ({
+    ...config.output,
+    plugins: config.plugins.filter(isOutputPlugin),
+  }));
+
+  debug.plugins = debug.plugins.filter(plugin => !isOutputPlugin(plugin));
+
+  return [debug, production];
 }