Waiting for npm install in a fresh codespace kills productivity. Prebuilds bake your dependencies into the image. Here's the configuration that actually works.

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GitHub Codespaces prebuilds can reduce environment creation time from 7+ minutes to ~25 seconds by front-loading dependency installation and compilation. The key is proper lifecycle command separation: heavy installs (npm ci) go in onCreateCommand, compilation in updateContentCommand, and secret-dependent steps in postCreateCommand. The guide covers a production-ready devcontainer.json, recommended prebuild trigger strategies per branch type, GitHub Actions CI integration using the devcontainers/ci action with path filtering, and cost management pitfalls including storage bloat, stale prebuilds, region availability, and secrets handling.

GitHub Codespaces Prebuilds: CI

How to Configure GitHub Codespaces Prebuilds

The Baseline devcontainer.json (Before Optimization)

The Optimized devcontainer.json for Prebuilds

Configuring Prebuild Triggers in Repository Settings

Integrating Prebuilds with GitHub Actions CI/CD