Production Builds

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mix volt.build

Building Tailwind CSS...
  app-1a2b3c4d.css  23.9 KB
Built Tailwind in 43ms
Building "assets/js/app.ts"...
  app-5e6f7a8b.js  128.4 KB
  manifest.json  2 entries
Built in 15ms

Reads configuration from config :volt. CLI flags override config values.

Source Maps

  • sourcemap: true — write .map files and append //# sourceMappingURL comment (default)
  • sourcemap: :hidden — write .map files without the URL comment (for Sentry, Datadog, etc.)
  • sourcemap: false — no source maps

CLI: --sourcemap hidden or --sourcemap false.

External Modules

Exclude packages that the host page already provides:

config :volt, external: ~w(phoenix phoenix_html phoenix_live_view)

Or per-build: mix volt.build --external phoenix --external phoenix_html

Module Preloading

For code-split builds, Volt.Preload.tags/2 generates <link rel="modulepreload"> tags from the build manifest to preload async chunks:

<%= Volt.Preload.tags("priv/static/assets/js/manifest.json", "/assets/js") %>

Deploy Alias

The installer generates an assets.deploy alias:

"assets.deploy": ["volt.build --tailwind", "phx.digest"]

This builds assets with content hashes, then generates the Phoenix digest manifest for CDN deployment.