svelte/.changeset/rich-olives-yell.md

---
'svelte': patch
---

fix: replace proxy-based readonly validation with stack-trace-based ownership tracking
fix: stack-trace-based readonly validation (#10464) * fix: remove readonly validation The readonly dev time validation results in false-negative object equality checks: The original object is proxified and thus comparisons could be between the unproxified and proxified version, which will always return false. Fixes #10372 There's also the problem that an object could be passed into a component but then passed upwards into shared state. At that point, it should no longer be readonly, but it's not possible to statically analyze these points. Fixes #10372 Lastly, the each block logic mutates an internal array and that also throws errors with the readonly logic. Fixes #10037 * reinstate tests * track ownership of state and mutations * working? * remove old changeset * tidy * error * simplify * fix * fix * fix * tidy * make it a warning * rename test * remove unused test * update tests * slap ts-expect-error everywhere, because its too finicky otherwise * oops * oh no the hall monitor is here * only call add_owner in dev * only owners can transfer ownership * simplify * fixes * tidy up * fix type error * while we're at it * rename file * rename functions * add some comments * move ownership checking logic * ugh eslint * more detailed message * only add filename in dev * comment * update tests * move more code * undo change to sourcemap tests * allow proxy to have multiple owners * use SignalDebug * i was doing this all wrong * tidy up * implement inheritance * fix * tidy up * update filename stuff * changeset --------- Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com> Co-authored-by: Rich Harris <rich.harris@vercel.com> 5 months ago			`---`
			`'svelte': patch`
			`---`

			`fix: replace proxy-based readonly validation with stack-trace-based ownership tracking`