first commit

public/assets/alpinejs/src/clone.js

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+import { effect, release, overrideEffect } from "./reactivity"
+import { initTree, isRoot } from "./lifecycle"
+import { walk } from "./utils/walk"
+
+export let isCloning = false
+
+export function skipDuringClone(callback, fallback = () => {}) {
+    return (...args) => isCloning ? fallback(...args) : callback(...args)
+}
+
+export function onlyDuringClone(callback) {
+    return (...args) => isCloning && callback(...args)
+}
+
+let interceptors = []
+
+export function interceptClone(callback) {
+    interceptors.push(callback)
+}
+
+export function cloneNode(from, to)
+{
+    interceptors.forEach(i => i(from, to))
+
+    isCloning = true
+
+    // We don't need reactive effects in the new tree.
+    // Cloning is just used to seed new server HTML with
+    // Alpine before "morphing" it onto live Alpine...
+    dontRegisterReactiveSideEffects(() => {
+        initTree(to, (el, callback) => {
+            // We're hijacking the "walker" so that we
+            // only initialize the element we're cloning...
+            callback(el, () => {})
+        })
+    })
+
+    isCloning = false
+}
+
+export let isCloningLegacy = false
+
+/** deprecated */
+export function clone(oldEl, newEl) {
+    if (! newEl._x_dataStack) newEl._x_dataStack = oldEl._x_dataStack
+
+    isCloning = true
+    isCloningLegacy = true
+
+    dontRegisterReactiveSideEffects(() => {
+        cloneTree(newEl)
+    })
+
+    isCloning = false
+    isCloningLegacy = false
+}
+
+/** deprecated */
+export function cloneTree(el) {
+    let hasRunThroughFirstEl = false
+
+    let shallowWalker = (el, callback) => {
+        walk(el, (el, skip) => {
+            if (hasRunThroughFirstEl && isRoot(el)) return skip()
+
+            hasRunThroughFirstEl = true
+
+            callback(el, skip)
+        })
+    }
+
+    initTree(el, shallowWalker)
+}
+
+function dontRegisterReactiveSideEffects(callback) {
+    let cache = effect
+
+    overrideEffect((callback, el) => {
+        let storedEffect = cache(callback)
+
+        release(storedEffect)
+
+        return () => {}
+    })
+
+    callback()
+
+    overrideEffect(cache)
+}