feat: setup Danger

.travis.yml

@@ -38,6 +38,7 @@ script:
     else
       yarn build
     fi
+  - yarn danger ci
 branches:
   except:
     - "/^v\\d+\\.\\d+\\.\\d+$/"

dangerfile.js

@@ -0,0 +1,40 @@
+/* eslint-disable import/no-extraneous-dependencies */
+import { danger, warn } from 'danger';
+import eslint from 'danger-plugin-eslint';
+
+// No PR is too small to include a description of why you made a change
+if (!danger.github.pr.body || danger.github.pr.body.length < 10) {
+  const title = ':grey_question: No Description';
+  const idea = 'Please include a description of your PR changes.';
+  warn(`${title} - <i>${idea}</i>`);
+}
+
+// Tags big PRs
+const bigPRThreshold = 600;
+if (danger.github.pr.additions + danger.github.pr.deletions > bigPRThreshold) {
+  const title = ':exclamation: Big PR';
+  const idea = `This PR is extremely unlikely to get reviewed because it touches ${danger.github.pr
+    .additions + danger.github.pr.deletions} lines.`;
+  warn(`${title} - <i>${idea}</i>`);
+} else if (
+  danger.git.modified_files + danger.git.added_files + danger.git.deleted_files >
+  bigPRThreshold
+) {
+  const title = ':exclamation: Big PR';
+  const idea = `This PR is extremely unlikely to get reviewed because it touches ${danger.git
+    .modified_files +
+    danger.git.added_files +
+    danger.git.deleted_files} files.`;
+  warn(`${title} - <i>${idea}</i>`);
+}
+
+// Check for a CHANGELOG entry
+const hasChangelog = danger.git.modified_files.some(f => f === 'CHANGELOG.md');
+if (!hasChangelog) {
+  const title = ':page_facing_up: Changelog Entry Missing';
+  const idea = 'Please add a changelog entry for your changes.';
+  warn(`${title} - <i>${idea}</i>`);
+}
+
+// Check for ESLint problems
+eslint();

package.json

@@ -84,6 +84,8 @@
     "babel-preset-env": "^1.6.1",
     "babel-preset-react": "^6.24.1",
     "babel-preset-stage-2": "^6.18.0",
+    "danger": "^3.4.5",
+    "danger-plugin-eslint": "^0.1.0",
     "decompress": "^4.2.0",
     "del": "^3.0.0",
     "devtron": "^1.4.0",