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perf(wasm): Trim the script copies embedded in runtime assemblies - #26057
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Uno.Wasm.Bootstrap extracts each assembly's WasmScripts/WasmCSS into the app's package folder at build time and the app loads those files, but the trimmed assemblies still carried the embedded copies: the browser runtime's 425 KB Uno.Runtime.Wasm.js and Uno.WinRT's Uno.Wasm.js, so every app downloaded them twice. Linker substitutions now remove them: -81 KB brotli on a blank app. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TXMNu2RupRy4QPFGK2cmij
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GitHub Issue: closes #26051
PR Type:
🐞 Bugfix
What changed? 🚀
Uno.Wasm.Bootstrap extracts each assembly's
WasmScripts/WasmCSSinto the app's package folder at build time (from the pre-link reference assemblies), and the app loads those files. The trimmed assemblies still carried the embedded copies, soUno.Runtime.Wasm.js(425 KB) andUno.Wasm.js(157 KB) were downloaded twice.Both projects now add an ILLink substitution that removes these resources from the linked output: −81 KB brotli (Runtime.WebAssembly.Browser −58 KB, WinRT −23 KB).
Validation:
package_*.Measurements
How this was measured
Blank
dotnet new unoapp(Skia,net10.0-browserwasm, Release publish), built twice from the same tree: with all six startup PRs (#26054–#26059) plusUnoXamlResourcesTrimming, and with only this PR's change removed. Both builds were served by the same static server (brotli q11, immutable caching for fingerprinted files) and loaded cold in headless Chrome, runs interleaved. "Visually ready" is the first CDP screencast frame identical to the settled final frame. 4G = 9 Mbps down, 85 ms RTT (CDP emulation). Values are medians with (min–max). A difference is only claimed where the ranges don't overlap. Rig: Playwright + Node, available on request.PR Checklist ✅
Screenshots Compare Test Runresults.🤖 Generated with Claude Code
https://claude.ai/code/session_01TXMNu2RupRy4QPFGK2cmij