fix: reduce host bootstrap waterfall with modulepreload#810
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The MF bootstrap loads hostInit → remoteEntry → _virtual_mf* → index via runtime dynamic imports the browser's preload scanner never sees, causing a serial waterfall on cold cache. The existing fix-preload plugin is gated on `exposes` so pure hosts were unoptimized. Adds `pluginHostInitPreload` which injects `<link rel="modulepreload">` for all four host-init chunks via `transformIndexHtml` (post, build-only), with no `exposes` gate so all hosts benefit automatically. Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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Remove trailing commas from function call arguments and break lines exceeding the 100-char print width to pass the fmt.check CI step. Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
gioboa
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Jun 12, 2026
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It's working fine: 
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Tests With Different Frameworks
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The MF bootstrap loads hostInit → remoteEntry → _virtual_mf* → index via runtime dynamic imports the browser's preload scanner never sees, causing a serial waterfall on cold cache. The existing fix-preload plugin is gated on
exposesso pure hosts were unoptimized.Adds
pluginHostInitPreloadwhich injects<link rel="modulepreload">for all four host-init chunks viatransformIndexHtml(post, build-only), with noexposesgate so all hosts benefit automatically.