Support non node environment validation

README.md

@@ -7,7 +7,7 @@ Adobe Experience Platform Tags is a next-generation tag management solution enab
 The extension validator helps extension developers validate that an extension package is well-structured. Namely, it verifies that:
 
 1. The extension has a [manifest](https://experienceleague.adobe.com/docs/experience-platform/tags/extension-dev/manifest.html?lang=en) (`extension.json`) matching the expected structure.
-2. All referenced directories and files exist at the specified locations within the extension directory. 
+2. All referenced directories and files exist at the specified locations within the extension directory. The manifest's `viewBasePath` must point to an existing directory (not a file, and not a missing path); at least one file must exist under that path. 
 
 For more information about developing an extension for Tags, please visit our [extension development guide](https://experienceleague.adobe.com/docs/experience-platform/tags/extension-dev/overview.html?lang=en).  
 
@@ -45,6 +45,49 @@ const error = validate(require('./extension.json'));
 console.log(error);
 ```
 
+### Using the validator in a browser or bundled app
+
+Browser (or other non-Node) consumers should use the `@adobe/reactor-validator/validate` subpath so they do not pull in Node-only code. The default export (`@adobe/reactor-validator`) scans the filesystem and is for Node only.
+
+The `validate` function has the signature `(extensionDescriptor, fileList)`:
+
+- **extensionDescriptor:** The parsed extension manifest (e.g. from `extension.json`).
+- **fileList:** An array of relative path strings for every file in the extension package (e.g. from a folder picker or zip). The caller is responsible for gathering this list; the validator only checks that required paths are present.
+- **Returns:** `undefined` if valid, or an error string on the first problem found.
+
+```javascript
+import validate from '@adobe/reactor-validator/validate';
+
+const error = validate(manifestJson, Array.from(filesMap.keys()));
+if (error) {
+  console.error(error);
+}
+```
+
+**Webpack alias for `ajv`:** The `validate` module depends on `ajv-draft-04`, which in turn requires `ajv` and resolves internal paths (e.g. `ajv/dist/core`). If your app does not list `ajv` as a direct dependency, add a resolve alias so the bundler uses the validator's `ajv`:
+
+- Resolve via an **exported** path (e.g. `@adobe/reactor-validator/validate`), not `package.json`, to avoid `ERR_PACKAGE_PATH_NOT_EXPORTED`.
+- Alias to the **package directory** of `ajv`, not to `ajv.js`, so subpaths resolve and Watchpack ENOTDIR errors are avoided.
+
+In your webpack config:
+
+```javascript
+const path = require('path');
+
+// Inside module.exports or your config object:
+resolve: {
+  alias: {
+    'ajv': path.join(
+      path.dirname(path.dirname(require.resolve('@adobe/reactor-validator/validate'))),
+      'node_modules',
+      'ajv'
+    )
+  }
+}
+```
+
+Alternatively, add `ajv` as a direct dependency in your project with the current version used here so the alias is unnecessary. However, this is very brittle. This project reserves the right to use a different version of `ajv` at any time.
+
 ## Contributing
 
 Contributions are welcomed! Read the [Contributing Guide](CONTRIBUTING.md) for more information.

lib/gatherFilesInNodeEnvironment.js

@@ -0,0 +1,44 @@
+/***************************************************************************************
+ * (c) 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ ****************************************************************************************/
+
+// Recursively scans a directory and returns an array of relative file path strings.
+// Node-only -- uses fs and path. Not suitable for browser environments.
+//
+// Example: for an extension layout like
+//   extension.json
+//   src/view/configuration.html
+//   src/view/events/click.html
+//   src/lib/main.js
+// the returned array is e.g.
+//   ['extension.json', 'src/view/configuration.html', 'src/view/events/click.html', 'src/lib/main.js']
+
+'use strict';
+var fs = require('fs');
+var pathUtil = require('path');
+
+var gatherFilesInNodeEnvironment = function(dir, root, result) {
+  root = root || dir;
+  result = result || [];
+  var entries = fs.readdirSync(dir);
+  entries.forEach(function(entry) {
+    var fullPath = pathUtil.join(dir, entry);
+    var relPath = pathUtil.relative(root, fullPath);
+    if (fs.statSync(fullPath).isDirectory()) {
+      gatherFilesInNodeEnvironment(fullPath, root, result);
+    } else {
+      result.push(relPath);
+    }
+  });
+  return result;
+};
+
+module.exports = gatherFilesInNodeEnvironment;

lib/index.js

@@ -10,134 +10,18 @@
  * governing permissions and limitations under the License.
  ****************************************************************************************/
 
-'use strict';
-
-var fs = require('fs');
-var pathUtil = require('path');
-var Ajv = require("ajv-draft-04")
-var addAJVFormats = require("ajv-formats")
-
-var isFile = function(path) {
-  try {
-    return fs.statSync(path).isFile();
-  } catch (e) {
-    return false;
-  }
-};
-
-var isDir = function(path) {
-  try {
-    return fs.statSync(path).isDirectory();
-  } catch (e) {
-    return false;
-  }
-};
-
-var stripQueryAndAnchor = function(path) {
-  path = path.split('?').shift();
-  path = path.split('#').shift();
-  return path;
-};
-
-var validateJsonStructure = function(extensionDescriptor) {
-  var platform = extensionDescriptor.platform;
-
-  if (!platform) {
-    return 'the required property "platform" is missing.';
-  }
-
-  var extensionDescriptorSchema =
-    require('@adobe/reactor-turbine-schemas/schemas/extension-package-' + platform + '.json');
-
-  var ajv = new Ajv({
-    schemaId: 'auto',
-    strict: false
-  });
-  addAJVFormats(ajv);
-
-  if (!ajv.validate(extensionDescriptorSchema, extensionDescriptor)) {
-    return ajv.errorsText();
-  }
-};
-
-var validateViewBasePath = function(extensionDescriptor) {
-  var absViewBasePath = pathUtil.resolve(
-    process.cwd(),
-    extensionDescriptor.viewBasePath
-  );
-
-  if (!isDir(absViewBasePath)) {
-    return absViewBasePath + ' is not a directory.';
-  }
-};
-
-var validateFiles = function(extensionDescriptor) {
-  var paths = [];
-  var platform = extensionDescriptor.platform;
-
-  if (!platform) {
-    return 'the required property "platform" is missing.';
-  }
-
-  if (extensionDescriptor.configuration) {
-    paths.push(pathUtil.resolve(
-      process.cwd(),
-      extensionDescriptor.viewBasePath,
-      stripQueryAndAnchor(extensionDescriptor.configuration.viewPath)
-    ));
-  }
-
-  if (extensionDescriptor.main) {
-    paths.push(pathUtil.resolve(
-      process.cwd(),
-      extensionDescriptor.main
-    ));
-  }
-
-  ['events', 'conditions', 'actions', 'dataElements'].forEach(function(featureType) {
-    var features = extensionDescriptor[featureType];
-
-    if (features) {
-      features.forEach(function(feature) {
-        if (feature.viewPath) {
-          paths.push(pathUtil.resolve(
-            process.cwd(),
-            extensionDescriptor.viewBasePath,
-            stripQueryAndAnchor(feature.viewPath)
-          ));
-        }
-
-        if (platform === 'web') {
-          paths.push(pathUtil.resolve(
-            process.cwd(),
-            feature.libPath
-          ));
-        }
-      });
-    }
-  });
-
-  for (var i = 0; i < paths.length; i++) {
-    var path = paths[i];
-    if (!isFile(path)) {
-      return path + ' is not a file.';
-    }
-  }
-};
+// Main entry point for Node consumers. Scans the current working directory for files,
+// then delegates to the portable validate function for schema and file validation.
+// Returns undefined if valid, or an error string if not.
 
+'use strict';
+var validate = require('./validate');
+var gatherFilesInNodeEnvironment = require('./gatherFilesInNodeEnvironment');
 
 module.exports = function(extensionDescriptor) {
-  var validators = [
-    validateJsonStructure,
-    validateViewBasePath,
-    validateFiles
-  ];
-
-  for (var i = 0; i < validators.length; i++) {
-    var error = validators[i](extensionDescriptor);
-
-    if (error) {
-      return 'An error was found in your extension.json: ' + error;
-    }
+  var fileList = gatherFilesInNodeEnvironment(process.cwd());
+  var error = validate(extensionDescriptor, fileList);
+  if (error) {
+    return 'An error was found in your extension.json: ' + error;
   }
 };

lib/validate.js

@@ -0,0 +1,28 @@
+/***************************************************************************************
+ * (c) 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ ****************************************************************************************/
+
+// Validates an extension descriptor against its JSON schema and a provided file list.
+// Portable -- no Node-specific APIs. Safe to use in browser environments.
+// Accepts (extensionDescriptor, fileList) where fileList is an array of relative path strings.
+// Returns undefined if valid, or an error string on the first problem encountered.
+
+'use strict';
+var validateSchema = require('./validateSchema');
+var validateFiles = require('./validateFiles');
+
+module.exports = function(extensionDescriptor, fileList) {
+  var error = validateSchema(extensionDescriptor);
+  if (error) return error;
+
+  error = validateFiles(extensionDescriptor, fileList);
+  if (error) return error;
+};

lib/validateFiles.js

@@ -0,0 +1,89 @@
+/***************************************************************************************
+ * (c) 2026 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ ****************************************************************************************/
+
+// Validates that files referenced by an extension descriptor exist in a provided file list.
+// Portable -- no Node-specific APIs. Safe to use in browser environments.
+// Accepts (extensionDescriptor, fileList) where fileList is an array of relative path strings.
+// Returns undefined if valid, or an error string if not.
+
+'use strict';
+
+var stripQueryAndAnchor = function(path) {
+  return path.split('?').shift().split('#').shift();
+};
+
+var joinPath = function() {
+  return [].slice.call(arguments).filter(Boolean).join('/').replace(/\/+/g, '/');
+};
+
+var validateViewBasePath = function(extensionDescriptor, fileSet, fileList) {
+  var viewBasePath = extensionDescriptor.viewBasePath;
+  if (!viewBasePath) return;
+
+  var viewBaseNorm = viewBasePath.replace(/\/+$/, '');
+  if (fileSet.has(viewBaseNorm)) {
+    return 'The referenced viewBasePath ' + viewBasePath + ' is either not a directory or is empty.';
+  }
+
+  var hasFileUnderPath = fileList.some(function(p) {
+    return p === viewBaseNorm || p.indexOf(viewBaseNorm + '/') === 0;
+  });
+  if (!hasFileUnderPath) {
+    return 'The referenced viewBasePath ' + viewBasePath + ' is either not a directory or is empty.';
+  }
+};
+
+var validateFileList = function(extensionDescriptor, fileSet) {
+  var paths = [];
+  var platform = extensionDescriptor.platform;
+  var viewBase = extensionDescriptor.viewBasePath;
+
+  if (!platform) {
+    return 'the required property "platform" is missing.';
+  }
+
+  if (extensionDescriptor.main) {
+    paths.push(extensionDescriptor.main);
+  }
+
+  if (extensionDescriptor.configuration) {
+    paths.push(joinPath(viewBase, stripQueryAndAnchor(extensionDescriptor.configuration.viewPath)));
+  }
+
+  ['events', 'conditions', 'actions', 'dataElements'].forEach(function(type) {
+    var features = extensionDescriptor[type];
+    if (features) {
+      features.forEach(function(feature) {
+        if (feature.viewPath) {
+          paths.push(joinPath(viewBase, stripQueryAndAnchor(feature.viewPath)));
+        }
+        if (platform === 'web') {
+          paths.push(feature.libPath);
+        }
+      });
+    }
+  });
+
+  for (var i = 0; i < paths.length; i++) {
+    if (!fileSet.has(paths[i])) {
+      return paths[i] + ' is not a file.';
+    }
+  }
+};
+
+module.exports = function(extensionDescriptor, fileList) {
+  var fileSet = new Set(fileList);
+  var error = validateViewBasePath(extensionDescriptor, fileSet, fileList);
+  if (error) return error;
+  error = validateFileList(extensionDescriptor, fileSet);
+  if (error) return error;
+};