feat: notify maintainers about configuration errors

package.json

@@ -12,7 +12,7 @@
   "main": "src/index.js",
   "scripts": {
     "start": "probot run ./src/index.js",
-    "watch": "nodemon --exec 'npm start'",
+    "watch": "nodemon --exec 'yarn run start'",
     "update": "ncu --upgrade --upgradeAll && yarn",
     "push": "git push --follow-tags origin master",
     "release": "standard-version && yarn run push"
@@ -25,6 +25,7 @@
     "joi": "^13.3.0",
     "probot": "^6.2.0",
     "probot-config": "^0.1.0",
+    "probot-messages": "^0.1.0",
     "probot-scheduler": "^1.1.0",
     "uuid": "^3.2.1"
   },

src/index.js

@@ -1,6 +1,7 @@
 const uuidV4 = require('uuid/v4');
 const createScheduler = require('probot-scheduler');
 const getMergedConfig = require('probot-config');
+const sendMessage = require('probot-messages');
 
 const App = require('./lock');
 const schema = require('./schema');
@@ -40,6 +41,16 @@ module.exports = async robot => {
       config = value;
     } catch (err) {
       log.warn({err: new Error(err), repo, file}, 'Invalid config');
+      if (['YAMLException', 'ValidationError'].includes(err.name)) {
+        await sendMessage(
+          robot,
+          context,
+          '[{appName}] Configuration error',
+          '[{appName}]({appUrl}) has encountered a configuration error in ' +
+            `\`${file}\`.\n\`\`\`\n${err.toString()}\n\`\`\``,
+          {update: 'The configuration error is still occurring.'}
+        );
+      }
     }
 
     return config;

yarn.lock

@@ -3074,6 +3074,10 @@ probot-config@^0.1.0:
   dependencies:
     js-yaml "^3.10.0"
 
+probot-messages@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/probot-messages/-/probot-messages-0.1.0.tgz#0a6b279486b2bb40a25e37960f7341ac40e5b0c9"
+
 probot-scheduler@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/probot-scheduler/-/probot-scheduler-1.1.0.tgz#eda193fd7faaf9a193a8b362903d78741dcda9b7"