Svelte Framework, a powerhouse in the frontend scene recently released version 5 with numerous major changes as announced during development. Key details of the modifications include:
– Runes: A system that defines which parts need to be reactive, no longer declared as regular variables. It specifies which variables are reactive states, similar to React’s useState.
– Event handler: Now functions as a property like passing other values, eliminating the need for “on:” as before. Additionally, createEventDispatcher is deprecated, suggesting the use of callback systems instead.
– Snippet: Content rendering system now uses functions, replacing the old slot tags which can now be passed as properties.
For those looking to embrace the new format entirely, significant changes in the code are inevitable. Svelte recommends migrating the code with “npx sv migrate svelte-5”.
Source: Svelte
TLDR: Svelte Framework has introduced version 5 with major updates including Runes, Event handler changes, and Snippet improvements. Migrating to the new format requires significant code adjustments.
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