fix(twilio-run): handles ngrok load error and actual ngrok errors (#305)

Fixes #275.

Author: philnash

packages/twilio-run/__tests__/config/start.withoutNgrok.test.ts

@@ -6,28 +6,32 @@ jest.mock('ngrok', () => {
 
 describe('getUrl', () => {
   test('calls ngrok if ngrok is defined', async () => {
-    const config = ({
+    const config = {
       ngrok: '',
-    } as unknown) as StartCliFlags;
+    } as unknown as StartCliFlags;
 
     expect.assertions(1);
     try {
       await getUrl(config, 3000);
     } catch (error) {
-      expect(error.message).toMatch("Cannot find module 'ngrok'");
+      expect(error.message).toMatch(
+        'ngrok could not be started because the module is not installed. Please install optional dependencies and try again.'
+      );
     }
   });
 
   test('calls ngrok with custom subdomain if passed', async () => {
-    const config = ({
+    const config = {
       ngrok: 'dom',
-    } as unknown) as StartCliFlags;
+    } as unknown as StartCliFlags;
 
     expect.assertions(1);
     try {
       await getUrl(config, 3000);
     } catch (error) {
-      expect(error.message).toMatch("Cannot find module 'ngrok'");
+      expect(error.message).toMatch(
+        'ngrok could not be started because the module is not installed. Please install optional dependencies and try again.'
+      );
     }
   });
 });

packages/twilio-run/src/commands/start.ts

@@ -90,9 +90,11 @@ export async function handler(
           resolve();
         } catch (error) {
           server.close(() => {
-            logger.info(
-              'ngrok could not be started because the module is not installed. Please install optional dependencies and try again.'
-            );
+            if (error.msg && error.details && error.details.err) {
+              logger.error(`${error.msg}\n\n${error.details.err}`);
+            } else {
+              logger.error(error.message);
+            }
             process.exit(1);
           });
         }

packages/twilio-run/src/config/start.ts

@@ -72,8 +72,15 @@ export async function getUrl(cli: StartCliFlags, port: string | number) {
     if (typeof cli.ngrok === 'string' && cli.ngrok.length > 0) {
       ngrokConfig.subdomain = cli.ngrok;
     }
-
-    url = await require('ngrok').connect(ngrokConfig);
+    let ngrok;
+    try {
+      ngrok = require('ngrok');
+    } catch (error) {
+      throw new Error(
+        'ngrok could not be started because the module is not installed. Please install optional dependencies and try again.'
+      );
+    }
+    url = await ngrok.connect(ngrokConfig);
     debug('ngrok tunnel URL: %s', url);
   }