fix: nicer error message on bad config file

packages/bundlemon/src/cli/__tests__/assets/bad-format.js

@@ -0,0 +1 @@
+module.exports = {;

packages/bundlemon/src/cli/__tests__/assets/bad-format.json

@@ -0,0 +1,3 @@
+{
+  "files": [
+}

packages/bundlemon/src/cli/__tests__/assets/bad-format.yaml

@@ -0,0 +1,3 @@
+files:
+  - 'a.js'
+  - 'b.js

packages/bundlemon/src/cli/__tests__/configFile.spec.ts

@@ -0,0 +1,39 @@
+import { loadConfigFile } from '../configFile';
+
+describe('load config file', () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  describe('failure', () => {
+    test('empty', async () => {
+      const config = await loadConfigFile('src/cli/__tests__/assets/empty.json');
+
+      expect(config).toBeUndefined();
+    });
+
+    test('bad format JSON', async () => {
+      const config = await loadConfigFile('src/cli/__tests__/assets/bad-format.json');
+
+      expect(config).toBeUndefined();
+    });
+
+    test('bad format YAML', async () => {
+      const config = await loadConfigFile('src/cli/__tests__/assets/bad-format.yaml');
+
+      expect(config).toBeUndefined();
+    });
+
+    test('bad format JS', async () => {
+      const config = await loadConfigFile('src/cli/__tests__/assets/bad-format.js');
+
+      expect(config).toBeUndefined();
+    });
+
+    test('not found', async () => {
+      const config = await loadConfigFile('not-found');
+
+      expect(config).toBeUndefined();
+    });
+  });
+});

packages/bundlemon/src/cli/configFile.ts

@@ -9,13 +9,18 @@ export async function loadConfigFile(configPath?: string): Promise<Config | unde
     logger.debug(`Load config file from "${configPath}"`);
   }
 
-  const cosmiconfigResult = await (configPath ? explorer.load(configPath) : explorer.search());
+  try {
+    const cosmiconfigResult = await (configPath ? explorer.load(configPath) : explorer.search());
 
-  if (!cosmiconfigResult || cosmiconfigResult.isEmpty) {
-    return undefined;
-  }
+    if (!cosmiconfigResult || cosmiconfigResult.isEmpty) {
+      return undefined;
+    }
 
-  logger.debug(`Config file loaded from "${cosmiconfigResult.filepath}"`);
+    logger.debug(`Config file loaded from "${cosmiconfigResult.filepath}"`);
 
-  return cosmiconfigResult.config;
+    return cosmiconfigResult.config;
+  } catch (e) {
+    logger.error(`Error loading config file: ${e}`);
+    return undefined;
+  }
 }