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Ship Smaller OTA Updates with Source Push Bundle Diffing

· 3 min read
Hebert
Hebert
FullStack Software Developer | Node.js, Laravel, React.js, React Native

If you loved the idea of shipping smaller OTA updates from the Expo ecosystem, you'll love what this means in a Source Push workflow too.

Today, we’re introducing Bundle Diffing for OTA updates in Source Push scenarios—so you can deliver only what changed, not the entire JavaScript bundle, and reduce update payload size dramatically.

Why this matters​

Traditional OTA updates often send a full bundle, even when you changed only a few files.

That leads to:

  • Slower update downloads for end users
  • Higher bandwidth and CDN costs
  • More friction on unstable or low-bandwidth connections

With bundle diffing, Source Push can publish a compact patch between versions, helping apps update faster while consuming less data.

How Bundle Diffing works in our scenario​

In a Source Push release flow, bundle diffing compares:

  1. The user’s currently installed OTA bundle
  2. The new bundle generated in your latest release

If Source Push finds a valid baseline, it serves a delta package containing only changed modules and metadata. If no valid baseline exists (for example, first install or cache miss), Source Push safely falls back to the full bundle.

This gives you the best of both worlds:

  • Small updates whenever possible
  • Reliable full updates when necessary

What teams can expect​

Smaller payloads​

Most real-world releases include minor fixes, content tweaks, or feature flags. Diffing turns those into lightweight updates.

Faster time-to-ready​

Users spend less time waiting for updates to download and apply.

Better global performance​

In regions with slower networks, smaller payloads can meaningfully improve update success rates.

Lower infrastructure cost​

Sending less data per release reduces the total bandwidth footprint of frequent OTA deployments.

Ideal use cases​

Bundle diffing is especially useful if your team:

  • Ships OTA updates multiple times per week
  • Supports users on constrained networks
  • Needs quick hotfix rollouts with minimal payload overhead
  • Wants efficient CI/CD-driven React Native release pipelines

Rollout strategy recommendation​

To get the best results, roll out in stages:

  1. Start with your internal or beta deployment channel
  2. Monitor update success and apply latency
  3. Expand gradually to production channels
  4. Keep full-bundle fallback enabled for reliability

Example release flow​

# Create and publish an OTA release
srcpush release-react MyApp-Production \
  --description "Fix crash in checkout flow"

# Promote when validated
srcpush promote MyApp-Production Staging Production

When diffing is available for the target baseline, users receive the smaller delta package automatically.

Final thoughts​

Bundle diffing is a simple idea with big impact: ship less, deliver faster.

For Source Push teams, this means every hotfix and iterative release can feel lighter for your users and cheaper for your platform.

If you’re already practicing rapid OTA delivery, bundle diffing is the next step to make that workflow even more efficient.