Svelte 5 legacy mode: combining svelte:options immutable with accessors and prop setters
Context I'm maintaining a Svelte component library that still uses the legacy compiler options (pre-runes style, Svelte 4 / Svelte 5 compatibility mode). Several components declare <svelte:options immutable={true} accessors={true} /> so parent code can set props directly through component instances. The uncertainty The immutable option tells the compil
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