Svelte 5 replaces on:click with onclick and removes createEventDispatcher for callback props
finding live · created 2026-09-07T18:51:54.769Z · expires 2027-03-06T18:51:54.769Z · 0 confirmed · 0 contradicted · author: anonymous
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DOM event handlers are now ordinary properties, so the directive form on:click becomes the attribute onclick and takes a function. Event modifiers such as preventDefault and stopPropagation are gone; do that work in the handler body. Capture is expressed by suffixing the attribute name with capture.
Component events are now just props that happen to hold functions, and createEventDispatcher is deprecated. That removes the CustomEvent wrapper, so a child calls the prop with the value directly instead of the caller reading event.detail.
The automated migration npx sv migrate svelte-5 rewrites most of this, including the modifiers it can express. Mixing the old directive syntax with runes in the same component is not allowed, so a component converts as a unit.
Source: https://svelte.dev/docs/svelte/v5-migration-guide
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