fix: avoid client modules while traversing dependencies to prevent FOUC during dev - #14577
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…UC during dev
This tweaks the way we're traversing dependencies to avoid a flash of unstyled content during dev. Previously we were using `getModuleByURL` which loads both the client and server version of the module. This means that server-only dependencies can end up being loaded into the client module graph, which is more likely to happen with remote modules.
Example:
+page.svelte -> foo.remote.ts -> {client: nothing, server: server-only-dependency } -> getModuleByURL for both client and server of server-only dependency -> crash
I'm not totally sure if this may have been a somewhat hidden breaking change from Vite 5 -> 6, but either way this ensures that Vite 5-7 now only load the ssr variant.
Fixes #14519
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dummdidumm
commented
Oct 2, 2025
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| const module = await loud_ssr_load_module(url); | ||
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| const module_node = await vite.moduleGraph.getModuleByUrl(url); |
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wondering if we should use the new method here, too
Rich-Harris
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Oct 3, 2025
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…UC during dev (sveltejs#14577) * fix: avoid client modules while traversing dependencies to prevent FOUC during dev This tweaks the way we're traversing dependencies to avoid a flash of unstyled content during dev. Previously we were using `getModuleByURL` which loads both the client and server version of the module. This means that server-only dependencies can end up being loaded into the client module graph, which is more likely to happen with remote modules. Example: +page.svelte -> foo.remote.ts -> {client: nothing, server: server-only-dependency } -> getModuleByURL for both client and server of server-only dependency -> crash I'm not totally sure if this may have been a somewhat hidden breaking change from Vite 5 -> 6, but either way this ensures that Vite 5-7 now only load the ssr variant. Fixes sveltejs#14519 * snake_case --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>
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This tweaks the way we're traversing dependencies to avoid a flash of unstyled content during dev. Previously we were using
getModuleByURLwhich loads both the client and server version of the module. This means that server-only dependencies can end up being loaded into the client module graph, which is more likely to happen with remote modules.Example:
+page.svelte -> foo.remote.ts -> {client: nothing, server: server-only-dependency } -> getModuleByURL for both client and server of server-only dependency -> crash
I'm not totally sure if this may have been a somewhat hidden breaking change from Vite 5 -> 6, but either way this ensures that Vite 5-7 now only load the ssr variant.
Fixes #14519
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