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Bump svelte from 4.2.18 to 5.53.5 #52

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2 changes: 1 addition & 1 deletion apps/sveltekit-2/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@
"eslint-plugin-svelte": "^2.35.1",
"prettier": "^3.1.1",
"prettier-plugin-svelte": "^3.1.2",
"svelte": "^4.2.7",
"svelte": "^5.53.5",
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@cursor cursor bot Feb 28, 2026

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Major Svelte bump without updating companion tooling packages

High Severity

Bumping svelte from v4 to v5 without updating @sveltejs/vite-plugin-svelte (currently ^3.0.0, needs v5+) and svelte-check (currently ^3.6.0, needs v4+) will likely break the build. Notably, @sveltejs/vite-plugin-svelte@3.1.1 pulls in svelte-hmr@0.16.0, which has a peer dependency of svelte: ^3.19.0 || ^4.0.0 — explicitly excluding Svelte 5. This is a major version migration that requires coordinated upgrades of the entire Svelte tooling ecosystem.

Additional Locations (1)

Fix in Cursor Fix in Web

"svelte-check": "^3.6.0",
"tslib": "^2.4.1",
"typescript": "^5.0.0",
Comment on lines 25 to 31
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@sentry sentry bot Feb 28, 2026

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Bug: The svelte package was upgraded to v5, but its dependencies @sveltejs/kit and @sveltejs/vite-plugin-svelte were not, creating incompatible peer dependencies that will cause build failures.
Severity: CRITICAL

Suggested Fix

To resolve the incompatibility, either revert the svelte package upgrade back to a 4.x version, or upgrade both @sveltejs/kit to a version compatible with Svelte 5 (like SvelteKit 3) and @sveltejs/vite-plugin-svelte to version 4.x or higher.

Prompt for AI Agent 
Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: apps/sveltekit-2/package.json#L25-L31

Potential issue: The `svelte` dependency was upgraded from version 4 to 5, but related
packages `@sveltejs/kit` (at `^2.0.0`) and `@sveltejs/vite-plugin-svelte` (at `^3.0.0`)
were not updated. SvelteKit 2.x is officially compatible with Svelte 4.x, not Svelte 5.
Furthermore, `@sveltejs/vite-plugin-svelte` version 3.x is designed for Svelte 4, while
Svelte 5 requires version 4.x of the plugin. This version mismatch will cause peer
dependency conflicts, which will prevent the application from building or running
correctly.

Did we get this right? 👍 / 👎 to inform future reviews.

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160 changes: 122 additions & 38 deletions yarn.lock
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Expand Up @@ -5,7 +5,7 @@ __metadata:
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Expand Down Expand Up @@ -6416,6 +6449,13 @@ __metadata:
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Expand Down Expand Up @@ -7415,7 +7455,7 @@ __metadata:
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Expand Down Expand Up @@ -7692,6 +7732,13 @@ __metadata:
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Expand Down Expand Up @@ -8051,7 +8098,7 @@ __metadata:
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Expand Down Expand Up @@ -8764,19 +8811,6 @@ __metadata:
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Expand Down Expand Up @@ -9737,6 +9771,13 @@ __metadata:
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Expand Down Expand Up @@ -20657,25 +20732,27 @@ __metadata:
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Expand Down
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