ci: Tweak travis steps for danger/bundle size

Author: bengourley

.travis.yml

@@ -7,6 +7,9 @@ before_script:
   - npx lerna run build --scope @bugsnag/browser
   - cat packages/browser/dist/bugsnag.min.js | wc -c > .size/after-minified
   - cat packages/browser/dist/bugsnag.min.js | gzip | wc -c > .size/after-gzipped
+  - git reset --hard HEAD
+  - git remote set-branches origin $TRAVIS_BRANCH
+  - git fetch
   - git checkout $TRAVIS_BRANCH
   - npm ci
   - npx lerna bootstrap --ignore @bugsnag/expo

dangerfile.js

@@ -14,11 +14,11 @@ const after = {
 
 const formatKbs = (n) => `${(n / 1000).toFixed(2)} kB`
 
-const diffMinSize = before.minified - after.minified
-const diffZipSize = before.gzipped - after.gzipped
+const diffMinSize = after.minified - before.minified
+const diffZipSize = after.gzipped - before.gzipped
 const showDiff = n => {
-  if (n > 0) return `⚠️ +${n} bytes ⬆️`
-  if (n < 0) return `-${n} bytes ⬇️`
+  if (n > 0) return `⚠️ \`+${n.toLocaleString()} bytes\``
+  if (n < 0) return `\`${n.toLocaleString()} bytes\``
   return '_No change_'
 }