ensure only skip dev modules as part of the build command context

tools/isobuild/bundler.js

@@ -1989,6 +1989,23 @@ function hashOfFiles(files) {
   ClientTarget.prototype[method] = Profile(`ClientTarget#${method}`, ClientTarget.prototype[method]);
 });
 
+/**
+ * Collects all dev-only package names.
+ *
+ * @returns {string[]} Array of dev-only package names
+ */
+function getDevOnlyPackages() {
+  const targets = global.meteorBundlerTargets || {};
+  return ['client', 'server'].flatMap(target => {
+    const pkgMap = targets[target]?.packageMap?._map;
+    if (!pkgMap) {
+      return [];
+    }
+    return Object.entries(pkgMap)
+      .filter(([_, pkg]) => pkg.packageSource?.devOnly)
+      .map(([name]) => name);
+  });
+}
 
 //////////////////// JsImageTarget and JsImage  ////////////////////
 
@@ -2418,6 +2435,10 @@ class JsImage {
       addNodeModulesDirToObject(nmd, nodeModulesDirectories);
     });
 
+    var devOnlySkipPackages = [];
+    const trySkipDevModule = global.currentCommand?.name === 'build' && buildMode === 'production';
+    if (trySkipDevModule) devOnlySkipPackages = getDevOnlyPackages();
+
     // If multiple load files share the same asset, only write one copy of
     // each. (eg, for app assets).
     var assetFilesBySha = {};
@@ -2429,6 +2450,11 @@ class JsImage {
         throw new Error("No targetPath?");
       }
 
+      // Skip dev-only packages on build for production
+      if (devOnlySkipPackages.some(_package => item?.targetPath?.includes(`${_package}.js`))) {
+        continue;
+      }
+
       var loadItem = {
         node_modules: {}
       };
@@ -2543,6 +2569,11 @@ class JsImage {
     for (const nmd of Object.values(nodeModulesDirectories)) {
       assert.strictEqual(typeof nmd.preferredBundlePath, "string");
 
+      // Skip dev-only packages on build for production
+      if (devOnlySkipPackages.includes(nmd?.packageName)) {
+        continue;
+      }
+
       // Skip calculating isPortable in 'meteor run' since the
       // modules are never rebuilt
       if (includeNodeModules !== 'symlink' && !nmd.isPortable()) {
@@ -2558,17 +2589,6 @@ class JsImage {
           symlink: includeNodeModules === 'symlink'
         };
 
-        const trySkipDevModule = global.currentCommand?.name === 'build' && buildMode === 'production';
-        if (trySkipDevModule) {
-          const targets = global.meteorBundlerTargets || {};
-          const isDevOnlyModule = ['client', 'server'].some(target =>
-            targets[target]?.packageMap?.getInfo(nmd?.packageName)?.packageSource?.devOnly
-          );
-          if (isDevOnlyModule) {
-            continue;
-          }
-        }
-
         const prodPackagePredicate =
             // This condition essentially means we don't strip devDependencies
             // when running tests, which is important for use cases like the one