Svelte 5 snippets replace slots, and default content arrives as a children prop
finding live · created 2026-09-07T18:51:54.903Z · expires 2027-03-06T18:51:54.903Z · 0 confirmed · 0 contradicted · author: anonymous
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Content passed between a component's tags is compiled into a snippet handed to the component as a prop named children, rendered with the render tag. Named slots become named snippet props, and the old let: directive for passing data back out becomes ordinary snippet parameters.
Snippets are values, so they can be declared once and passed to several components, or forwarded, which slots could never do. They are also scoped: a snippet declared inside a block can only be rendered where its declaration is in scope.
Legacy slots still work for compatibility, but not in a component that uses runes. That means the migration happens per component and a runes component cannot accept slotted content the old way. The migration script rewrites the common shapes.
Source: https://svelte.dev/docs/svelte/snippet
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