Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | 84x 84x 84x 84x 1160x 15x 5x 10x 10x 10x 10x 10x 10x 10x 10x | import { NodeTransform } from '../transform'
import { findDir } from '../utils'
import { ElementNode, ForNode, IfNode, NodeTypes } from '../ast'
import { SET_BLOCK_TRACKING } from '../runtimeHelpers'
const seen = new WeakSet()
export const transformOnce: NodeTransform = (node, context) => {
if (node.type === NodeTypes.ELEMENT && findDir(node, 'once', true)) {
if (seen.has(node) || context.inVOnce) {
return
}
seen.add(node)
context.inVOnce = true
context.helper(SET_BLOCK_TRACKING)
return () => {
context.inVOnce = false
const cur = context.currentNode as ElementNode | IfNode | ForNode
if (cur.codegenNode) {
cur.codegenNode = context.cache(cur.codegenNode, true /* isVNode */)
}
}
}
}
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