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[web] Emit build precache manifest for custom service workers and PWAs (--web-content-hash) #191916
Description
Summary
Part of umbrella issue #149031.
Following the deprecation and removal of default built-in service worker generation (#156910), provide first-party build metadata and loader hooks to enable developers to build custom service workers and offline PWAs with content-hashed assets.
Scope & Requirements
- Output a machine-readable Bill of Materials manifest (
precache_manifest.jsonorflutter_assets_manifest.json) inbuild/web/listing all output filenames and their content hashes duringflutter build web --web-content-hash. - Enable tools like Workbox CLI or custom build scripts to ingest the manifest directly without fragile file-globbing scripts.
- Provide clean
serviceWorker: { scriptUrl: 'custom_sw.js' }configuration hooks influtter_bootstrap.jsto register and activate custom service workers before the Flutter engine starts.
Activity
fix(web): hide --web-content-hash until content hashing is complete (f…
feat(web): emit precache_manifest.json when --web-content-hash is ena…
feat(web): emit precache_manifest.json when --web-content-hash is ena…
github-actions commentedon Oct 5, 2026
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