improve webpack clean configuration with build folder filtering

npm-packages/meteor-rspack/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@meteorjs/rspack",
-  "version": "0.0.29",
+  "version": "0.0.30",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@meteorjs/rspack",
-      "version": "0.0.29",
+      "version": "0.0.30",
       "license": "ISC",
       "dependencies": {
         "ignore-loader": "^0.1.2",

npm-packages/meteor-rspack/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@meteorjs/rspack",
-  "version": "0.0.29",
+  "version": "0.0.30",
   "description": "Configuration logic for using Rspack in Meteor projects",
   "main": "index.js",
   "type": "module",

npm-packages/meteor-rspack/rspack.config.js

@@ -98,6 +98,16 @@ function createCoffeescriptConfig({ swcConfig }) {
   };
 }
 
+// Keep files outside of build folders
+function keepOutsideBuild() {
+  return (p) => {
+    const normalized = '/' + path.normalize(p).replaceAll(path.sep, '/').replace(/^\/+/, '');
+    const isInBuildRoot = /\/_build(\/|$)/.test(normalized);
+    const isInBuildStar = /\/_build-[^/]+(\/|$)/.test(normalized);
+    return !(isInBuildRoot || isInBuildStar); // true => KEEP, false => DELETE
+  };
+}
+
 // Watch options shared across both builds
 const defaultWatchOptions = {
   ignored: ['**/.meteor/local/**', '**/dist/**'],
@@ -282,7 +292,7 @@ export default function (inMeteor = {}, argv = {}) {
       cssChunkFilename: `${assetsContext}/[id]${
         isProd ? '.[contenthash]' : ''
       }.css`,
-      clean: isProd,
+      ...(isProd && { clean: { keep: keepOutsideBuild() } }),
     },
     optimization: {
       usedExports: true,
@@ -371,7 +381,7 @@ export default function (inMeteor = {}, argv = {}) {
       libraryTarget: 'commonjs',
       chunkFilename: `${bundlesContext}/[id]${isProd ? '.[chunkhash]' : ''}.js`,
       assetModuleFilename: `${assetsContext}/[hash][ext][query]`,
-      clean: isProd,
+      ...(isProd && { clean: { keep: keepOutsideBuild() } }),
     },
     optimization: { usedExports: true },
     module: {

packages/rspack/lib/constants.js

@@ -5,7 +5,7 @@
 
 export const DEFAULT_RSPACK_VERSION = '1.4.8';
 
-export const DEFAULT_METEOR_RSPACK_VERSION = '0.0.29';
+export const DEFAULT_METEOR_RSPACK_VERSION = '0.0.30';
 
 export const DEFAULT_METEOR_RSPACK_REACT_HMR_VERSION = '1.4.3';