| 1 | --- |
| 2 | title: Hoist Static JSX Elements |
| 3 | impact: LOW |
| 4 | impactDescription: avoids re-creation |
| 5 | tags: rendering, jsx, static, optimization |
| 6 | --- |
| 7 | |
| 8 | ## Hoist Static JSX Elements |
| 9 | |
| 10 | Extract static JSX outside components to avoid re-creation. |
| 11 | |
| 12 | **Incorrect (recreates element every render):** |
| 13 | |
| 14 | ```tsx |
| 15 | function LoadingSkeleton() { |
| 16 | return <div className="animate-pulse h-20 bg-gray-200" /> |
| 17 | } |
| 18 | |
| 19 | function Container() { |
| 20 | return ( |
| 21 | <div> |
| 22 | {loading && <LoadingSkeleton />} |
| 23 | </div> |
| 24 | ) |
| 25 | } |
| 26 | ``` |
| 27 | |
| 28 | **Correct (reuses same element):** |
| 29 | |
| 30 | ```tsx |
| 31 | const loadingSkeleton = ( |
| 32 | <div className="animate-pulse h-20 bg-gray-200" /> |
| 33 | ) |
| 34 | |
| 35 | function Container() { |
| 36 | return ( |
| 37 | <div> |
| 38 | {loading && loadingSkeleton} |
| 39 | </div> |
| 40 | ) |
| 41 | } |
| 42 | ``` |
| 43 | |
| 44 | This is especially helpful for large and static SVG nodes, which can be expensive to recreate on every render. |
| 45 | |
| 46 | **Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler automatically hoists static JSX elements and optimizes component re-renders, making manual hoisting unnecessary. |
| 47 |