Precise DOM morphing
morphing
typescript
dom
Use `moveBefore`
+9
-1
+9
-1
src/morphlex.ts
+9
-1
src/morphlex.ts
···
73
73
else throw new Error("[Morphlex] The string was not a valid HTML node.")
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74
}
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75
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+
// Feature detection for moveBefore support (cached for performance)
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+
const supportsMoveBefore = typeof Element.prototype.moveBefore === "function"
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+
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class Morph {
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readonly #idMap: IdMap
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81
···
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#insertBefore(parent: ParentNode, node: Node, insertionPoint: ChildNode): void {
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if (node === insertionPoint) return
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385
383
-
parent.insertBefore(node, insertionPoint)
386
+
// Use moveBefore when available (more efficient for moving existing nodes)
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+
if (supportsMoveBefore) {
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+
;(parent as any).moveBefore(node, insertionPoint)
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+
} else {
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+
parent.insertBefore(node, insertionPoint)
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+
}
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}
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394
#appendChild(node: ParentNode, newNode: Node): void {