22 lines
744 B
TypeScript
22 lines
744 B
TypeScript
import { ElementWithTransition } from '../components/Transition'
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// compiler should normalize class + :class bindings on the same element
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// into a single binding ['staticClass', dynamic]
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export function patchClass(el: Element, value: string | null, isSVG: boolean) {
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if (value == null) {
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value = ''
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}
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// directly setting className should be faster than setAttribute in theory
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if (isSVG) {
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el.setAttribute('class', value)
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} else {
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// if this is an element during a transition, take the temporary transition
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// classes into account.
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const transitionClasses = (el as ElementWithTransition)._vtc
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if (transitionClasses) {
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value = [value, ...transitionClasses].join(' ')
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}
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el.className = value
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}
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}
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