Svelte's Reactivity: A Compiler, Not a Library
Svelte achieves reactivity at compile time, not runtime. It's a compiler that turns your component files into efficient, imperative JavaScript that updates the DOM directly, skipping the virtual DOM. The footgun: reactivity only triggers on assignment.
Svelte's reactivity is a compile-time trick. Instead of shipping a heavy runtime library, Svelte acts as a compiler, analyzing your code and generating highly optimized vanilla JavaScript to surgically update the DOM, skipping the overhead of a virtual DOM. This results in smaller bundles and faster performance. The footgun: reactivity is tied to the assignment operator (`=`), so mutating an array with `.push()` won't trigger an update without a reassignment.
Read the original → developer.mozilla.org
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