/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { hasInSkipHydrationBlockFlag } from '../hydration/skip_hydration';
import { ViewEncapsulation } from '../metadata/view';
import { RendererStyleFlags2 } from '../render/api_flags';
import { consumerDestroy } from '../signals';
import { addToArray, removeFromArray } from '../util/array_utils';
import { assertDefined, assertEqual, assertFunction, assertNumber, assertString } from '../util/assert';
import { escapeCommentText } from '../util/dom';
import { assertLContainer, assertLView, assertParentView, assertProjectionSlots, assertTNodeForLView } from './assert';
import { attachPatchData } from './context_discovery';
import { icuContainerIterate } from './i18n/i18n_tree_shaking';
import { CONTAINER_HEADER_OFFSET, HAS_TRANSPLANTED_VIEWS, MOVED_VIEWS, NATIVE } from './interfaces/container';
import { NodeInjectorFactory } from './interfaces/injector';
import { unregisterLView } from './interfaces/lview_tracking';
import { isLContainer, isLView } from './interfaces/type_checks';
import { CHILD_HEAD, CLEANUP, DECLARATION_COMPONENT_VIEW, DECLARATION_LCONTAINER, FLAGS, HOST, NEXT, ON_DESTROY_HOOKS, PARENT, QUERIES, REACTIVE_HOST_BINDING_CONSUMER, REACTIVE_TEMPLATE_CONSUMER, RENDERER, T_HOST, TVIEW } from './interfaces/view';
import { assertTNodeType } from './node_assert';
import { profiler } from './profiler';
import { setUpAttributes } from './util/attrs_utils';
import { getLViewParent } from './util/view_traversal_utils';
import { clearViewRefreshFlag, getNativeByTNode, unwrapRNode } from './util/view_utils';
/**
 * NOTE: for performance reasons, the possible actions are inlined within the function instead of
 * being passed as an argument.
 */
function applyToElementOrContainer(action, renderer, parent, lNodeToHandle, beforeNode) {
    // If this slot was allocated for a text node dynamically created by i18n, the text node itself
    // won't be created until i18nApply() in the update block, so this node should be skipped.
    // For more info, see "ICU expressions should work inside an ngTemplateOutlet inside an ngFor"
    // in `i18n_spec.ts`.
    if (lNodeToHandle != null) {
        let lContainer;
        let isComponent = false;
        // We are expecting an RNode, but in the case of a component or LContainer the `RNode` is
        // wrapped in an array which needs to be unwrapped. We need to know if it is a component and if
        // it has LContainer so that we can process all of those cases appropriately.
        if (isLContainer(lNodeToHandle)) {
            lContainer = lNodeToHandle;
        }
        else if (isLView(lNodeToHandle)) {
            isComponent = true;
            ngDevMode && assertDefined(lNodeToHandle[HOST], 'HOST must be defined for a component LView');
            lNodeToHandle = lNodeToHandle[HOST];
        }
        const rNode = unwrapRNode(lNodeToHandle);
        if (action === 0 /* WalkTNodeTreeAction.Create */ && parent !== null) {
            if (beforeNode == null) {
                nativeAppendChild(renderer, parent, rNode);
            }
            else {
                nativeInsertBefore(renderer, parent, rNode, beforeNode || null, true);
            }
        }
        else if (action === 1 /* WalkTNodeTreeAction.Insert */ && parent !== null) {
            nativeInsertBefore(renderer, parent, rNode, beforeNode || null, true);
        }
        else if (action === 2 /* WalkTNodeTreeAction.Detach */) {
            nativeRemoveNode(renderer, rNode, isComponent);
        }
        else if (action === 3 /* WalkTNodeTreeAction.Destroy */) {
            ngDevMode && ngDevMode.rendererDestroyNode++;
            renderer.destroyNode(rNode);
        }
        if (lContainer != null) {
            applyContainer(renderer, action, lContainer, parent, beforeNode);
        }
    }
}
export function createTextNode(renderer, value) {
    ngDevMode && ngDevMode.rendererCreateTextNode++;
    ngDevMode && ngDevMode.rendererSetText++;
    return renderer.createText(value);
}
export function updateTextNode(renderer, rNode, value) {
    ngDevMode && ngDevMode.rendererSetText++;
    renderer.setValue(rNode, value);
}
export function createCommentNode(renderer, value) {
    ngDevMode && ngDevMode.rendererCreateComment++;
    return renderer.createComment(escapeCommentText(value));
}
/**
 * Creates a native element from a tag name, using a renderer.
 * @param renderer A renderer to use
 * @param name the tag name
 * @param namespace Optional namespace for element.
 * @returns the element created
 */
export function createElementNode(renderer, name, namespace) {
    ngDevMode && ngDevMode.rendererCreateElement++;
    return renderer.createElement(name, namespace);
}
/**
 * Removes all DOM elements associated with a view.
 *
 * Because some root nodes of the view may be containers, we sometimes need
 * to propagate deeply into the nested containers to remove all elements in the
 * views beneath it.
 *
 * @param tView The `TView' of the `LView` from which elements should be added or removed
 * @param lView The view from which elements should be added or removed
 */
export function removeViewFromDOM(tView, lView) {
    const renderer = lView[RENDERER];
    applyView(tView, lView, renderer, 2 /* WalkTNodeTreeAction.Detach */, null, null);
    lView[HOST] = null;
    lView[T_HOST] = null;
}
/**
 * Adds all DOM elements associated with a view.
 *
 * Because some root nodes of the view may be containers, we sometimes need
 * to propagate deeply into the nested containers to add all elements in the
 * views beneath it.
 *
 * @param tView The `TView' of the `LView` from which elements should be added or removed
 * @param parentTNode The `TNode` where the `LView` should be attached to.
 * @param renderer Current renderer to use for DOM manipulations.
 * @param lView The view from which elements should be added or removed
 * @param parentNativeNode The parent `RElement` where it should be inserted into.
 * @param beforeNode The node before which elements should be added, if insert mode
 */
export function addViewToDOM(tView, parentTNode, renderer, lView, parentNativeNode, beforeNode) {
    lView[HOST] = parentNativeNode;
    lView[T_HOST] = parentTNode;
    applyView(tView, lView, renderer, 1 /* WalkTNodeTreeAction.Insert */, parentNativeNode, beforeNode);
}
/**
 * Detach a `LView` from the DOM by detaching its nodes.
 *
 * @param tView The `TView' of the `LView` to be detached
 * @param lView the `LView` to be detached.
 */
export function detachViewFromDOM(tView, lView) {
    applyView(tView, lView, lView[RENDERER], 2 /* WalkTNodeTreeAction.Detach */, null, null);
}
/**
 * Traverses down and up the tree of views and containers to remove listeners and
 * call onDestroy callbacks.
 *
 * Notes:
 *  - Because it's used for onDestroy calls, it needs to be bottom-up.
 *  - Must process containers instead of their views to avoid splicing
 *  when views are destroyed and re-added.
 *  - Using a while loop because it's faster than recursion
 *  - Destroy only called on movement to sibling or movement to parent (laterally or up)
 *
 *  @param rootView The view to destroy
 */
export function destroyViewTree(rootView) {
    // If the view has no children, we can clean it up and return early.
    let lViewOrLContainer = rootView[CHILD_HEAD];
    if (!lViewOrLContainer) {
        return cleanUpView(rootView[TVIEW], rootView);
    }
    while (lViewOrLContainer) {
        let next = null;
        if (isLView(lViewOrLContainer)) {
            // If LView, traverse down to child.
            next = lViewOrLContainer[CHILD_HEAD];
        }
        else {
            ngDevMode && assertLContainer(lViewOrLContainer);
            // If container, traverse down to its first LView.
            const firstView = lViewOrLContainer[CONTAINER_HEADER_OFFSET];
            if (firstView)
                next = firstView;
        }
        if (!next) {
            // Only clean up view when moving to the side or up, as destroy hooks
            // should be called in order from the bottom up.
            while (lViewOrLContainer && !lViewOrLContainer[NEXT] && lViewOrLContainer !== rootView) {
                if (isLView(lViewOrLContainer)) {
                    cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);
                }
                lViewOrLContainer = lViewOrLContainer[PARENT];
            }
            if (lViewOrLContainer === null)
                lViewOrLContainer = rootView;
            if (isLView(lViewOrLContainer)) {
                cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);
            }
            next = lViewOrLContainer && lViewOrLContainer[NEXT];
        }
        lViewOrLContainer = next;
    }
}
/**
 * Inserts a view into a container.
 *
 * This adds the view to the container's array of active views in the correct
 * position. It also adds the view's elements to the DOM if the container isn't a
 * root node of another view (in that case, the view's elements will be added when
 * the container's parent view is added later).
 *
 * @param tView The `TView' of the `LView` to insert
 * @param lView The view to insert
 * @param lContainer The container into which the view should be inserted
 * @param index Which index in the container to insert the child view into
 */
export function insertView(tView, lView, lContainer, index) {
    ngDevMode && assertLView(lView);
    ngDevMode && assertLContainer(lContainer);
    const indexInContainer = CONTAINER_HEADER_OFFSET + index;
    const containerLength = lContainer.length;
    if (index > 0) {
        // This is a new view, we need to add it to the children.
        lContainer[indexInContainer - 1][NEXT] = lView;
    }
    if (index < containerLength - CONTAINER_HEADER_OFFSET) {
        lView[NEXT] = lContainer[indexInContainer];
        addToArray(lContainer, CONTAINER_HEADER_OFFSET + index, lView);
    }
    else {
        lContainer.push(lView);
        lView[NEXT] = null;
    }
    lView[PARENT] = lContainer;
    // track views where declaration and insertion points are different
    const declarationLContainer = lView[DECLARATION_LCONTAINER];
    if (declarationLContainer !== null && lContainer !== declarationLContainer) {
        trackMovedView(declarationLContainer, lView);
    }
    // notify query that a new view has been added
    const lQueries = lView[QUERIES];
    if (lQueries !== null) {
        lQueries.insertView(tView);
    }
    // Sets the attached flag
    lView[FLAGS] |= 128 /* LViewFlags.Attached */;
}
/**
 * Track views created from the declaration container (TemplateRef) and inserted into a
 * different LContainer.
 */
function trackMovedView(declarationContainer, lView) {
    ngDevMode && assertDefined(lView, 'LView required');
    ngDevMode && assertLContainer(declarationContainer);
    const movedViews = declarationContainer[MOVED_VIEWS];
    const insertedLContainer = lView[PARENT];
    ngDevMode && assertLContainer(insertedLContainer);
    const insertedComponentLView = insertedLContainer[PARENT][DECLARATION_COMPONENT_VIEW];
    ngDevMode && assertDefined(insertedComponentLView, 'Missing insertedComponentLView');
    const declaredComponentLView = lView[DECLARATION_COMPONENT_VIEW];
    ngDevMode && assertDefined(declaredComponentLView, 'Missing declaredComponentLView');
    if (declaredComponentLView !== insertedComponentLView) {
        // At this point the declaration-component is not same as insertion-component; this means that
        // this is a transplanted view. Mark the declared lView as having transplanted views so that
        // those views can participate in CD.
        declarationContainer[HAS_TRANSPLANTED_VIEWS] = true;
    }
    if (movedViews === null) {
        declarationContainer[MOVED_VIEWS] = [lView];
    }
    else {
        movedViews.push(lView);
    }
}
function detachMovedView(declarationContainer, lView) {
    ngDevMode && assertLContainer(declarationContainer);
    ngDevMode &&
        assertDefined(declarationContainer[MOVED_VIEWS], 'A projected view should belong to a non-empty projected views collection');
    const movedViews = declarationContainer[MOVED_VIEWS];
    const declarationViewIndex = movedViews.indexOf(lView);
    const insertionLContainer = lView[PARENT];
    ngDevMode && assertLContainer(insertionLContainer);
    // If the view was marked for refresh but then detached before it was checked (where the flag
    // would be cleared and the counter decremented), we need to update the status here.
    clearViewRefreshFlag(lView);
    movedViews.splice(declarationViewIndex, 1);
}
/**
 * Detaches a view from a container.
 *
 * This method removes the view from the container's array of active views. It also
 * removes the view's elements from the DOM.
 *
 * @param lContainer The container from which to detach a view
 * @param removeIndex The index of the view to detach
 * @returns Detached LView instance.
 */
export function detachView(lContainer, removeIndex) {
    if (lContainer.length <= CONTAINER_HEADER_OFFSET)
        return;
    const indexInContainer = CONTAINER_HEADER_OFFSET + removeIndex;
    const viewToDetach = lContainer[indexInContainer];
    if (viewToDetach) {
        const declarationLContainer = viewToDetach[DECLARATION_LCONTAINER];
        if (declarationLContainer !== null && declarationLContainer !== lContainer) {
            detachMovedView(declarationLContainer, viewToDetach);
        }
        if (removeIndex > 0) {
            lContainer[indexInContainer - 1][NEXT] = viewToDetach[NEXT];
        }
        const removedLView = removeFromArray(lContainer, CONTAINER_HEADER_OFFSET + removeIndex);
        removeViewFromDOM(viewToDetach[TVIEW], viewToDetach);
        // notify query that a view has been removed
        const lQueries = removedLView[QUERIES];
        if (lQueries !== null) {
            lQueries.detachView(removedLView[TVIEW]);
        }
        viewToDetach[PARENT] = null;
        viewToDetach[NEXT] = null;
        // Unsets the attached flag
        viewToDetach[FLAGS] &= ~128 /* LViewFlags.Attached */;
    }
    return viewToDetach;
}
/**
 * A standalone function which destroys an LView,
 * conducting clean up (e.g. removing listeners, calling onDestroys).
 *
 * @param tView The `TView' of the `LView` to be destroyed
 * @param lView The view to be destroyed.
 */
export function destroyLView(tView, lView) {
    if (!(lView[FLAGS] & 256 /* LViewFlags.Destroyed */)) {
        const renderer = lView[RENDERER];
        lView[REACTIVE_TEMPLATE_CONSUMER] && consumerDestroy(lView[REACTIVE_TEMPLATE_CONSUMER]);
        lView[REACTIVE_HOST_BINDING_CONSUMER] && consumerDestroy(lView[REACTIVE_HOST_BINDING_CONSUMER]);
        if (renderer.destroyNode) {
            applyView(tView, lView, renderer, 3 /* WalkTNodeTreeAction.Destroy */, null, null);
        }
        destroyViewTree(lView);
    }
}
/**
 * Calls onDestroys hooks for all directives and pipes in a given view and then removes all
 * listeners. Listeners are removed as the last step so events delivered in the onDestroys hooks
 * can be propagated to @Output listeners.
 *
 * @param tView `TView` for the `LView` to clean up.
 * @param lView The LView to clean up
 */
function cleanUpView(tView, lView) {
    if (!(lView[FLAGS] & 256 /* LViewFlags.Destroyed */)) {
        // Usually the Attached flag is removed when the view is detached from its parent, however
        // if it's a root view, the flag won't be unset hence why we're also removing on destroy.
        lView[FLAGS] &= ~128 /* LViewFlags.Attached */;
        // Mark the LView as destroyed *before* executing the onDestroy hooks. An onDestroy hook
        // runs arbitrary user code, which could include its own `viewRef.destroy()` (or similar). If
        // We don't flag the view as destroyed before the hooks, this could lead to an infinite loop.
        // This also aligns with the ViewEngine behavior. It also means that the onDestroy hook is
        // really more of an "afterDestroy" hook if you think about it.
        lView[FLAGS] |= 256 /* LViewFlags.Destroyed */;
        executeOnDestroys(tView, lView);
        processCleanups(tView, lView);
        // For component views only, the local renderer is destroyed at clean up time.
        if (lView[TVIEW].type === 1 /* TViewType.Component */) {
            ngDevMode && ngDevMode.rendererDestroy++;
            lView[RENDERER].destroy();
        }
        const declarationContainer = lView[DECLARATION_LCONTAINER];
        // we are dealing with an embedded view that is still inserted into a container
        if (declarationContainer !== null && isLContainer(lView[PARENT])) {
            // and this is a projected view
            if (declarationContainer !== lView[PARENT]) {
                detachMovedView(declarationContainer, lView);
            }
            // For embedded views still attached to a container: remove query result from this view.
            const lQueries = lView[QUERIES];
            if (lQueries !== null) {
                lQueries.detachView(tView);
            }
        }
        // Unregister the view once everything else has been cleaned up.
        unregisterLView(lView);
    }
}
/** Removes listeners and unsubscribes from output subscriptions */
function processCleanups(tView, lView) {
    const tCleanup = tView.cleanup;
    const lCleanup = lView[CLEANUP];
    if (tCleanup !== null) {
        for (let i = 0; i < tCleanup.length - 1; i += 2) {
            if (typeof tCleanup[i] === 'string') {
                // This is a native DOM listener. It will occupy 4 entries in the TCleanup array (hence i +=
                // 2 at the end of this block).
                const targetIdx = tCleanup[i + 3];
                ngDevMode && assertNumber(targetIdx, 'cleanup target must be a number');
                if (targetIdx >= 0) {
                    // unregister
                    lCleanup[targetIdx]();
                }
                else {
                    // Subscription
                    lCleanup[-targetIdx].unsubscribe();
                }
                i += 2;
            }
            else {
                // This is a cleanup function that is grouped with the index of its context
                const context = lCleanup[tCleanup[i + 1]];
                tCleanup[i].call(context);
            }
        }
    }
    if (lCleanup !== null) {
        lView[CLEANUP] = null;
    }
    const destroyHooks = lView[ON_DESTROY_HOOKS];
    if (destroyHooks !== null) {
        // Reset the ON_DESTROY_HOOKS array before iterating over it to prevent hooks that unregister
        // themselves from mutating the array during iteration.
        lView[ON_DESTROY_HOOKS] = null;
        for (let i = 0; i < destroyHooks.length; i++) {
            const destroyHooksFn = destroyHooks[i];
            ngDevMode && assertFunction(destroyHooksFn, 'Expecting destroy hook to be a function.');
            destroyHooksFn();
        }
    }
}
/** Calls onDestroy hooks for this view */
function executeOnDestroys(tView, lView) {
    let destroyHooks;
    if (tView != null && (destroyHooks = tView.destroyHooks) != null) {
        for (let i = 0; i < destroyHooks.length; i += 2) {
            const context = lView[destroyHooks[i]];
            // Only call the destroy hook if the context has been requested.
            if (!(context instanceof NodeInjectorFactory)) {
                const toCall = destroyHooks[i + 1];
                if (Array.isArray(toCall)) {
                    for (let j = 0; j < toCall.length; j += 2) {
                        const callContext = context[toCall[j]];
                        const hook = toCall[j + 1];
                        profiler(4 /* ProfilerEvent.LifecycleHookStart */, callContext, hook);
                        try {
                            hook.call(callContext);
                        }
                        finally {
                            profiler(5 /* ProfilerEvent.LifecycleHookEnd */, callContext, hook);
                        }
                    }
                }
                else {
                    profiler(4 /* ProfilerEvent.LifecycleHookStart */, context, toCall);
                    try {
                        toCall.call(context);
                    }
                    finally {
                        profiler(5 /* ProfilerEvent.LifecycleHookEnd */, context, toCall);
                    }
                }
            }
        }
    }
}
/**
 * Returns a native element if a node can be inserted into the given parent.
 *
 * There are two reasons why we may not be able to insert a element immediately.
 * - Projection: When creating a child content element of a component, we have to skip the
 *   insertion because the content of a component will be projected.
 *   `<component><content>delayed due to projection</content></component>`
 * - Parent container is disconnected: This can happen when we are inserting a view into
 *   parent container, which itself is disconnected. For example the parent container is part
 *   of a View which has not be inserted or is made for projection but has not been inserted
 *   into destination.
 *
 * @param tView: Current `TView`.
 * @param tNode: `TNode` for which we wish to retrieve render parent.
 * @param lView: Current `LView`.
 */
export function getParentRElement(tView, tNode, lView) {
    return getClosestRElement(tView, tNode.parent, lView);
}
/**
 * Get closest `RElement` or `null` if it can't be found.
 *
 * If `TNode` is `TNodeType.Element` => return `RElement` at `LView[tNode.index]` location.
 * If `TNode` is `TNodeType.ElementContainer|IcuContain` => return the parent (recursively).
 * If `TNode` is `null` then return host `RElement`:
 *   - return `null` if projection
 *   - return `null` if parent container is disconnected (we have no parent.)
 *
 * @param tView: Current `TView`.
 * @param tNode: `TNode` for which we wish to retrieve `RElement` (or `null` if host element is
 *     needed).
 * @param lView: Current `LView`.
 * @returns `null` if the `RElement` can't be determined at this time (no parent / projection)
 */
export function getClosestRElement(tView, tNode, lView) {
    let parentTNode = tNode;
    // Skip over element and ICU containers as those are represented by a comment node and
    // can't be used as a render parent.
    while (parentTNode !== null &&
        (parentTNode.type & (8 /* TNodeType.ElementContainer */ | 32 /* TNodeType.Icu */))) {
        tNode = parentTNode;
        parentTNode = tNode.parent;
    }
    // If the parent tNode is null, then we are inserting across views: either into an embedded view
    // or a component view.
    if (parentTNode === null) {
        // We are inserting a root element of the component view into the component host element and
        // it should always be eager.
        return lView[HOST];
    }
    else {
        ngDevMode && assertTNodeType(parentTNode, 3 /* TNodeType.AnyRNode */ | 4 /* TNodeType.Container */);
        const { componentOffset } = parentTNode;
        if (componentOffset > -1) {
            ngDevMode && assertTNodeForLView(parentTNode, lView);
            const { encapsulation } = tView.data[parentTNode.directiveStart + componentOffset];
            // We've got a parent which is an element in the current view. We just need to verify if the
            // parent element is not a component. Component's content nodes are not inserted immediately
            // because they will be projected, and so doing insert at this point would be wasteful.
            // Since the projection would then move it to its final destination. Note that we can't
            // make this assumption when using the Shadow DOM, because the native projection placeholders
            // (<content> or <slot>) have to be in place as elements are being inserted.
            if (encapsulation === ViewEncapsulation.None ||
                encapsulation === ViewEncapsulation.Emulated) {
                return null;
            }
        }
        return getNativeByTNode(parentTNode, lView);
    }
}
/**
 * Inserts a native node before another native node for a given parent.
 * This is a utility function that can be used when native nodes were determined.
 */
export function nativeInsertBefore(renderer, parent, child, beforeNode, isMove) {
    ngDevMode && ngDevMode.rendererInsertBefore++;
    renderer.insertBefore(parent, child, beforeNode, isMove);
}
function nativeAppendChild(renderer, parent, child) {
    ngDevMode && ngDevMode.rendererAppendChild++;
    ngDevMode && assertDefined(parent, 'parent node must be defined');
    renderer.appendChild(parent, child);
}
function nativeAppendOrInsertBefore(renderer, parent, child, beforeNode, isMove) {
    if (beforeNode !== null) {
        nativeInsertBefore(renderer, parent, child, beforeNode, isMove);
    }
    else {
        nativeAppendChild(renderer, parent, child);
    }
}
/** Removes a node from the DOM given its native parent. */
function nativeRemoveChild(renderer, parent, child, isHostElement) {
    renderer.removeChild(parent, child, isHostElement);
}
/** Checks if an element is a `<template>` node. */
function isTemplateNode(node) {
    return node.tagName === 'TEMPLATE' && node.content !== undefined;
}
/**
 * Returns a native parent of a given native node.
 */
export function nativeParentNode(renderer, node) {
    return renderer.parentNode(node);
}
/**
 * Returns a native sibling of a given native node.
 */
export function nativeNextSibling(renderer, node) {
    return renderer.nextSibling(node);
}
/**
 * Find a node in front of which `currentTNode` should be inserted.
 *
 * This method determines the `RNode` in front of which we should insert the `currentRNode`. This
 * takes `TNode.insertBeforeIndex` into account if i18n code has been invoked.
 *
 * @param parentTNode parent `TNode`
 * @param currentTNode current `TNode` (The node which we would like to insert into the DOM)
 * @param lView current `LView`
 */
function getInsertInFrontOfRNode(parentTNode, currentTNode, lView) {
    return _getInsertInFrontOfRNodeWithI18n(parentTNode, currentTNode, lView);
}
/**
 * Find a node in front of which `currentTNode` should be inserted. (Does not take i18n into
 * account)
 *
 * This method determines the `RNode` in front of which we should insert the `currentRNode`. This
 * does not take `TNode.insertBeforeIndex` into account.
 *
 * @param parentTNode parent `TNode`
 * @param currentTNode current `TNode` (The node which we would like to insert into the DOM)
 * @param lView current `LView`
 */
export function getInsertInFrontOfRNodeWithNoI18n(parentTNode, currentTNode, lView) {
    if (parentTNode.type & (8 /* TNodeType.ElementContainer */ | 32 /* TNodeType.Icu */)) {
        return getNativeByTNode(parentTNode, lView);
    }
    return null;
}
/**
 * Tree shakable boundary for `getInsertInFrontOfRNodeWithI18n` function.
 *
 * This function will only be set if i18n code runs.
 */
let _getInsertInFrontOfRNodeWithI18n = getInsertInFrontOfRNodeWithNoI18n;
/**
 * Tree shakable boundary for `processI18nInsertBefore` function.
 *
 * This function will only be set if i18n code runs.
 */
let _processI18nInsertBefore;
export function setI18nHandling(getInsertInFrontOfRNodeWithI18n, processI18nInsertBefore) {
    _getInsertInFrontOfRNodeWithI18n = getInsertInFrontOfRNodeWithI18n;
    _processI18nInsertBefore = processI18nInsertBefore;
}
/**
 * Appends the `child` native node (or a collection of nodes) to the `parent`.
 *
 * @param tView The `TView' to be appended
 * @param lView The current LView
 * @param childRNode The native child (or children) that should be appended
 * @param childTNode The TNode of the child element
 */
export function appendChild(tView, lView, childRNode, childTNode) {
    const parentRNode = getParentRElement(tView, childTNode, lView);
    const renderer = lView[RENDERER];
    const parentTNode = childTNode.parent || lView[T_HOST];
    const anchorNode = getInsertInFrontOfRNode(parentTNode, childTNode, lView);
    if (parentRNode != null) {
        if (Array.isArray(childRNode)) {
            for (let i = 0; i < childRNode.length; i++) {
                nativeAppendOrInsertBefore(renderer, parentRNode, childRNode[i], anchorNode, false);
            }
        }
        else {
            nativeAppendOrInsertBefore(renderer, parentRNode, childRNode, anchorNode, false);
        }
    }
    _processI18nInsertBefore !== undefined &&
        _processI18nInsertBefore(renderer, childTNode, lView, childRNode, parentRNode);
}
/**
 * Returns the first native node for a given LView, starting from the provided TNode.
 *
 * Native nodes are returned in the order in which those appear in the native tree (DOM).
 */
export function getFirstNativeNode(lView, tNode) {
    if (tNode !== null) {
        ngDevMode &&
            assertTNodeType(tNode, 3 /* TNodeType.AnyRNode */ | 12 /* TNodeType.AnyContainer */ | 32 /* TNodeType.Icu */ | 16 /* TNodeType.Projection */);
        const tNodeType = tNode.type;
        if (tNodeType & 3 /* TNodeType.AnyRNode */) {
            return getNativeByTNode(tNode, lView);
        }
        else if (tNodeType & 4 /* TNodeType.Container */) {
            return getBeforeNodeForView(-1, lView[tNode.index]);
        }
        else if (tNodeType & 8 /* TNodeType.ElementContainer */) {
            const elIcuContainerChild = tNode.child;
            if (elIcuContainerChild !== null) {
                return getFirstNativeNode(lView, elIcuContainerChild);
            }
            else {
                const rNodeOrLContainer = lView[tNode.index];
                if (isLContainer(rNodeOrLContainer)) {
                    return getBeforeNodeForView(-1, rNodeOrLContainer);
                }
                else {
                    return unwrapRNode(rNodeOrLContainer);
                }
            }
        }
        else if (tNodeType & 32 /* TNodeType.Icu */) {
            let nextRNode = icuContainerIterate(tNode, lView);
            let rNode = nextRNode();
            // If the ICU container has no nodes, than we use the ICU anchor as the node.
            return rNode || unwrapRNode(lView[tNode.index]);
        }
        else {
            const projectionNodes = getProjectionNodes(lView, tNode);
            if (projectionNodes !== null) {
                if (Array.isArray(projectionNodes)) {
                    return projectionNodes[0];
                }
                const parentView = getLViewParent(lView[DECLARATION_COMPONENT_VIEW]);
                ngDevMode && assertParentView(parentView);
                return getFirstNativeNode(parentView, projectionNodes);
            }
            else {
                return getFirstNativeNode(lView, tNode.next);
            }
        }
    }
    return null;
}
export function getProjectionNodes(lView, tNode) {
    if (tNode !== null) {
        const componentView = lView[DECLARATION_COMPONENT_VIEW];
        const componentHost = componentView[T_HOST];
        const slotIdx = tNode.projection;
        ngDevMode && assertProjectionSlots(lView);
        return componentHost.projection[slotIdx];
    }
    return null;
}
export function getBeforeNodeForView(viewIndexInContainer, lContainer) {
    const nextViewIndex = CONTAINER_HEADER_OFFSET + viewIndexInContainer + 1;
    if (nextViewIndex < lContainer.length) {
        const lView = lContainer[nextViewIndex];
        const firstTNodeOfView = lView[TVIEW].firstChild;
        if (firstTNodeOfView !== null) {
            return getFirstNativeNode(lView, firstTNodeOfView);
        }
    }
    return lContainer[NATIVE];
}
/**
 * Removes a native node itself using a given renderer. To remove the node we are looking up its
 * parent from the native tree as not all platforms / browsers support the equivalent of
 * node.remove().
 *
 * @param renderer A renderer to be used
 * @param rNode The native node that should be removed
 * @param isHostElement A flag indicating if a node to be removed is a host of a component.
 */
export function nativeRemoveNode(renderer, rNode, isHostElement) {
    ngDevMode && ngDevMode.rendererRemoveNode++;
    const nativeParent = nativeParentNode(renderer, rNode);
    if (nativeParent) {
        nativeRemoveChild(renderer, nativeParent, rNode, isHostElement);
    }
}
/**
 * Clears the contents of a given RElement.
 *
 * @param rElement the native RElement to be cleared
 */
export function clearElementContents(rElement) {
    rElement.textContent = '';
}
/**
 * Performs the operation of `action` on the node. Typically this involves inserting or removing
 * nodes on the LView or projection boundary.
 */
function applyNodes(renderer, action, tNode, lView, parentRElement, beforeNode, isProjection) {
    while (tNode != null) {
        ngDevMode && assertTNodeForLView(tNode, lView);
        ngDevMode &&
            assertTNodeType(tNode, 3 /* TNodeType.AnyRNode */ | 12 /* TNodeType.AnyContainer */ | 16 /* TNodeType.Projection */ | 32 /* TNodeType.Icu */);
        const rawSlotValue = lView[tNode.index];
        const tNodeType = tNode.type;
        if (isProjection) {
            if (action === 0 /* WalkTNodeTreeAction.Create */) {
                rawSlotValue && attachPatchData(unwrapRNode(rawSlotValue), lView);
                tNode.flags |= 2 /* TNodeFlags.isProjected */;
            }
        }
        if ((tNode.flags & 32 /* TNodeFlags.isDetached */) !== 32 /* TNodeFlags.isDetached */) {
            if (tNodeType & 8 /* TNodeType.ElementContainer */) {
                applyNodes(renderer, action, tNode.child, lView, parentRElement, beforeNode, false);
                applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);
            }
            else if (tNodeType & 32 /* TNodeType.Icu */) {
                const nextRNode = icuContainerIterate(tNode, lView);
                let rNode;
                while (rNode = nextRNode()) {
                    applyToElementOrContainer(action, renderer, parentRElement, rNode, beforeNode);
                }
                applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);
            }
            else if (tNodeType & 16 /* TNodeType.Projection */) {
                applyProjectionRecursive(renderer, action, lView, tNode, parentRElement, beforeNode);
            }
            else {
                ngDevMode && assertTNodeType(tNode, 3 /* TNodeType.AnyRNode */ | 4 /* TNodeType.Container */);
                applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);
            }
        }
        tNode = isProjection ? tNode.projectionNext : tNode.next;
    }
}
function applyView(tView, lView, renderer, action, parentRElement, beforeNode) {
    applyNodes(renderer, action, tView.firstChild, lView, parentRElement, beforeNode, false);
}
/**
 * `applyProjection` performs operation on the projection.
 *
 * Inserting a projection requires us to locate the projected nodes from the parent component. The
 * complication is that those nodes themselves could be re-projected from their parent component.
 *
 * @param tView The `TView` of `LView` which needs to be inserted, detached, destroyed
 * @param lView The `LView` which needs to be inserted, detached, destroyed.
 * @param tProjectionNode node to project
 */
export function applyProjection(tView, lView, tProjectionNode) {
    const renderer = lView[RENDERER];
    const parentRNode = getParentRElement(tView, tProjectionNode, lView);
    const parentTNode = tProjectionNode.parent || lView[T_HOST];
    let beforeNode = getInsertInFrontOfRNode(parentTNode, tProjectionNode, lView);
    applyProjectionRecursive(renderer, 0 /* WalkTNodeTreeAction.Create */, lView, tProjectionNode, parentRNode, beforeNode);
}
/**
 * `applyProjectionRecursive` performs operation on the projection specified by `action` (insert,
 * detach, destroy)
 *
 * Inserting a projection requires us to locate the projected nodes from the parent component. The
 * complication is that those nodes themselves could be re-projected from their parent component.
 *
 * @param renderer Render to use
 * @param action action to perform (insert, detach, destroy)
 * @param lView The LView which needs to be inserted, detached, destroyed.
 * @param tProjectionNode node to project
 * @param parentRElement parent DOM element for insertion/removal.
 * @param beforeNode Before which node the insertions should happen.
 */
function applyProjectionRecursive(renderer, action, lView, tProjectionNode, parentRElement, beforeNode) {
    const componentLView = lView[DECLARATION_COMPONENT_VIEW];
    const componentNode = componentLView[T_HOST];
    ngDevMode &&
        assertEqual(typeof tProjectionNode.projection, 'number', 'expecting projection index');
    const nodeToProjectOrRNodes = componentNode.projection[tProjectionNode.projection];
    if (Array.isArray(nodeToProjectOrRNodes)) {
        // This should not exist, it is a bit of a hack. When we bootstrap a top level node and we
        // need to support passing projectable nodes, so we cheat and put them in the TNode
        // of the Host TView. (Yes we put instance info at the T Level). We can get away with it
        // because we know that that TView is not shared and therefore it will not be a problem.
        // This should be refactored and cleaned up.
        for (let i = 0; i < nodeToProjectOrRNodes.length; i++) {
            const rNode = nodeToProjectOrRNodes[i];
            applyToElementOrContainer(action, renderer, parentRElement, rNode, beforeNode);
        }
    }
    else {
        let nodeToProject = nodeToProjectOrRNodes;
        const projectedComponentLView = componentLView[PARENT];
        // If a parent <ng-content> is located within a skip hydration block,
        // annotate an actual node that is being projected with the same flag too.
        if (hasInSkipHydrationBlockFlag(tProjectionNode)) {
            nodeToProject.flags |= 128 /* TNodeFlags.inSkipHydrationBlock */;
        }
        applyNodes(renderer, action, nodeToProject, projectedComponentLView, parentRElement, beforeNode, true);
    }
}
/**
 * `applyContainer` performs an operation on the container and its views as specified by
 * `action` (insert, detach, destroy)
 *
 * Inserting a Container is complicated by the fact that the container may have Views which
 * themselves have containers or projections.
 *
 * @param renderer Renderer to use
 * @param action action to perform (insert, detach, destroy)
 * @param lContainer The LContainer which needs to be inserted, detached, destroyed.
 * @param parentRElement parent DOM element for insertion/removal.
 * @param beforeNode Before which node the insertions should happen.
 */
function applyContainer(renderer, action, lContainer, parentRElement, beforeNode) {
    ngDevMode && assertLContainer(lContainer);
    const anchor = lContainer[NATIVE]; // LContainer has its own before node.
    const native = unwrapRNode(lContainer);
    // An LContainer can be created dynamically on any node by injecting ViewContainerRef.
    // Asking for a ViewContainerRef on an element will result in a creation of a separate anchor
    // node (comment in the DOM) that will be different from the LContainer's host node. In this
    // particular case we need to execute action on 2 nodes:
    // - container's host node (this is done in the executeActionOnElementOrContainer)
    // - container's host node (this is done here)
    if (anchor !== native) {
        // This is very strange to me (Misko). I would expect that the native is same as anchor. I
        // don't see a reason why they should be different, but they are.
        //
        // If they are we need to process the second anchor as well.
        applyToElementOrContainer(action, renderer, parentRElement, anchor, beforeNode);
    }
    for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
        const lView = lContainer[i];
        applyView(lView[TVIEW], lView, renderer, action, parentRElement, anchor);
    }
}
/**
 * Writes class/style to element.
 *
 * @param renderer Renderer to use.
 * @param isClassBased `true` if it should be written to `class` (`false` to write to `style`)
 * @param rNode The Node to write to.
 * @param prop Property to write to. This would be the class/style name.
 * @param value Value to write. If `null`/`undefined`/`false` this is considered a remove (set/add
 *        otherwise).
 */
export function applyStyling(renderer, isClassBased, rNode, prop, value) {
    if (isClassBased) {
        // We actually want JS true/false here because any truthy value should add the class
        if (!value) {
            ngDevMode && ngDevMode.rendererRemoveClass++;
            renderer.removeClass(rNode, prop);
        }
        else {
            ngDevMode && ngDevMode.rendererAddClass++;
            renderer.addClass(rNode, prop);
        }
    }
    else {
        let flags = prop.indexOf('-') === -1 ? undefined : RendererStyleFlags2.DashCase;
        if (value == null /** || value === undefined */) {
            ngDevMode && ngDevMode.rendererRemoveStyle++;
            renderer.removeStyle(rNode, prop, flags);
        }
        else {
            // A value is important if it ends with `!important`. The style
            // parser strips any semicolons at the end of the value.
            const isImportant = typeof value === 'string' ? value.endsWith('!important') : false;
            if (isImportant) {
                // !important has to be stripped from the value for it to be valid.
                value = value.slice(0, -10);
                flags |= RendererStyleFlags2.Important;
            }
            ngDevMode && ngDevMode.rendererSetStyle++;
            renderer.setStyle(rNode, prop, value, flags);
        }
    }
}
/**
 * Write `cssText` to `RElement`.
 *
 * This function does direct write without any reconciliation. Used for writing initial values, so
 * that static styling values do not pull in the style parser.
 *
 * @param renderer Renderer to use
 * @param element The element which needs to be updated.
 * @param newValue The new class list to write.
 */
export function writeDirectStyle(renderer, element, newValue) {
    ngDevMode && assertString(newValue, '\'newValue\' should be a string');
    renderer.setAttribute(element, 'style', newValue);
    ngDevMode && ngDevMode.rendererSetStyle++;
}
/**
 * Write `className` to `RElement`.
 *
 * This function does direct write without any reconciliation. Used for writing initial values, so
 * that static styling values do not pull in the style parser.
 *
 * @param renderer Renderer to use
 * @param element The element which needs to be updated.
 * @param newValue The new class list to write.
 */
export function writeDirectClass(renderer, element, newValue) {
    ngDevMode && assertString(newValue, '\'newValue\' should be a string');
    if (newValue === '') {
        // There are tests in `google3` which expect `element.getAttribute('class')` to be `null`.
        renderer.removeAttribute(element, 'class');
    }
    else {
        renderer.setAttribute(element, 'class', newValue);
    }
    ngDevMode && ngDevMode.rendererSetClassName++;
}
/** Sets up the static DOM attributes on an `RNode`. */
export function setupStaticAttributes(renderer, element, tNode) {
    const { mergedAttrs, classes, styles } = tNode;
    if (mergedAttrs !== null) {
        setUpAttributes(renderer, element, mergedAttrs);
    }
    if (classes !== null) {
        writeDirectClass(renderer, element, classes);
    }
    if (styles !== null) {
        writeDirectStyle(renderer, element, styles);
    }
}
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {hasInSkipHydrationBlockFlag} from '../hydration/skip_hydration';\nimport {ViewEncapsulation} from '../metadata/view';\nimport {RendererStyleFlags2} from '../render/api_flags';\nimport {consumerDestroy} from '../signals';\nimport {addToArray, removeFromArray} from '../util/array_utils';\nimport {assertDefined, assertEqual, assertFunction, assertNumber, assertString} from '../util/assert';\nimport {escapeCommentText} from '../util/dom';\n\nimport {assertLContainer, assertLView, assertParentView, assertProjectionSlots, assertTNodeForLView} from './assert';\nimport {attachPatchData} from './context_discovery';\nimport {icuContainerIterate} from './i18n/i18n_tree_shaking';\nimport {CONTAINER_HEADER_OFFSET, HAS_TRANSPLANTED_VIEWS, LContainer, MOVED_VIEWS, NATIVE} from './interfaces/container';\nimport {ComponentDef} from './interfaces/definition';\nimport {NodeInjectorFactory} from './interfaces/injector';\nimport {unregisterLView} from './interfaces/lview_tracking';\nimport {TElementNode, TIcuContainerNode, TNode, TNodeFlags, TNodeType, TProjectionNode} from './interfaces/node';\nimport {Renderer} from './interfaces/renderer';\nimport {RComment, RElement, RNode, RTemplate, RText} from './interfaces/renderer_dom';\nimport {isLContainer, isLView} from './interfaces/type_checks';\nimport {CHILD_HEAD, CLEANUP, DECLARATION_COMPONENT_VIEW, DECLARATION_LCONTAINER, DestroyHookData, FLAGS, HookData, HookFn, HOST, LView, LViewFlags, NEXT, ON_DESTROY_HOOKS, PARENT, QUERIES, REACTIVE_HOST_BINDING_CONSUMER, REACTIVE_TEMPLATE_CONSUMER, RENDERER, T_HOST, TVIEW, TView, TViewType} from './interfaces/view';\nimport {assertTNodeType} from './node_assert';\nimport {profiler, ProfilerEvent} from './profiler';\nimport {setUpAttributes} from './util/attrs_utils';\nimport {getLViewParent} from './util/view_traversal_utils';\nimport {clearViewRefreshFlag, getNativeByTNode, unwrapRNode} from './util/view_utils';\n\nconst enum WalkTNodeTreeAction {\n  /** node create in the native environment. Run on initial creation. */\n  Create = 0,\n\n  /**\n   * node insert in the native environment.\n   * Run when existing node has been detached and needs to be re-attached.\n   */\n  Insert = 1,\n\n  /** node detach from the native environment */\n  Detach = 2,\n\n  /** node destruction using the renderer's API */\n  Destroy = 3,\n}\n\n\n\n/**\n * NOTE: for performance reasons, the possible actions are inlined within the function instead of\n * being passed as an argument.\n */\nfunction applyToElementOrContainer(\n    action: WalkTNodeTreeAction, renderer: Renderer, parent: RElement|null,\n    lNodeToHandle: RNode|LContainer|LView, beforeNode?: RNode|null) {\n  // If this slot was allocated for a text node dynamically created by i18n, the text node itself\n  // won't be created until i18nApply() in the update block, so this node should be skipped.\n  // For more info, see \"ICU expressions should work inside an ngTemplateOutlet inside an ngFor\"\n  // in `i18n_spec.ts`.\n  if (lNodeToHandle != null) {\n    let lContainer: LContainer|undefined;\n    let isComponent = false;\n    // We are expecting an RNode, but in the case of a component or LContainer the `RNode` is\n    // wrapped in an array which needs to be unwrapped. We need to know if it is a component and if\n    // it has LContainer so that we can process all of those cases appropriately.\n    if (isLContainer(lNodeToHandle)) {\n      lContainer = lNodeToHandle;\n    } else if (isLView(lNodeToHandle)) {\n      isComponent = true;\n      ngDevMode && assertDefined(lNodeToHandle[HOST], 'HOST must be defined for a component LView');\n      lNodeToHandle = lNodeToHandle[HOST]!;\n    }\n    const rNode: RNode = unwrapRNode(lNodeToHandle);\n\n    if (action === WalkTNodeTreeAction.Create && parent !== null) {\n      if (beforeNode == null) {\n        nativeAppendChild(renderer, parent, rNode);\n      } else {\n        nativeInsertBefore(renderer, parent, rNode, beforeNode || null, true);\n      }\n    } else if (action === WalkTNodeTreeAction.Insert && parent !== null) {\n      nativeInsertBefore(renderer, parent, rNode, beforeNode || null, true);\n    } else if (action === WalkTNodeTreeAction.Detach) {\n      nativeRemoveNode(renderer, rNode, isComponent);\n    } else if (action === WalkTNodeTreeAction.Destroy) {\n      ngDevMode && ngDevMode.rendererDestroyNode++;\n      renderer.destroyNode!(rNode);\n    }\n    if (lContainer != null) {\n      applyContainer(renderer, action, lContainer, parent, beforeNode);\n    }\n  }\n}\n\nexport function createTextNode(renderer: Renderer, value: string): RText {\n  ngDevMode && ngDevMode.rendererCreateTextNode++;\n  ngDevMode && ngDevMode.rendererSetText++;\n  return renderer.createText(value);\n}\n\nexport function updateTextNode(renderer: Renderer, rNode: RText, value: string): void {\n  ngDevMode && ngDevMode.rendererSetText++;\n  renderer.setValue(rNode, value);\n}\n\nexport function createCommentNode(renderer: Renderer, value: string): RComment {\n  ngDevMode && ngDevMode.rendererCreateComment++;\n  return renderer.createComment(escapeCommentText(value));\n}\n\n/**\n * Creates a native element from a tag name, using a renderer.\n * @param renderer A renderer to use\n * @param name the tag name\n * @param namespace Optional namespace for element.\n * @returns the element created\n */\nexport function createElementNode(\n    renderer: Renderer, name: string, namespace: string|null): RElement {\n  ngDevMode && ngDevMode.rendererCreateElement++;\n  return renderer.createElement(name, namespace);\n}\n\n\n/**\n * Removes all DOM elements associated with a view.\n *\n * Because some root nodes of the view may be containers, we sometimes need\n * to propagate deeply into the nested containers to remove all elements in the\n * views beneath it.\n *\n * @param tView The `TView' of the `LView` from which elements should be added or removed\n * @param lView The view from which elements should be added or removed\n */\nexport function removeViewFromDOM(tView: TView, lView: LView): void {\n  const renderer = lView[RENDERER];\n  applyView(tView, lView, renderer, WalkTNodeTreeAction.Detach, null, null);\n  lView[HOST] = null;\n  lView[T_HOST] = null;\n}\n\n/**\n * Adds all DOM elements associated with a view.\n *\n * Because some root nodes of the view may be containers, we sometimes need\n * to propagate deeply into the nested containers to add all elements in the\n * views beneath it.\n *\n * @param tView The `TView' of the `LView` from which elements should be added or removed\n * @param parentTNode The `TNode` where the `LView` should be attached to.\n * @param renderer Current renderer to use for DOM manipulations.\n * @param lView The view from which elements should be added or removed\n * @param parentNativeNode The parent `RElement` where it should be inserted into.\n * @param beforeNode The node before which elements should be added, if insert mode\n */\nexport function addViewToDOM(\n    tView: TView, parentTNode: TNode, renderer: Renderer, lView: LView, parentNativeNode: RElement,\n    beforeNode: RNode|null): void {\n  lView[HOST] = parentNativeNode;\n  lView[T_HOST] = parentTNode;\n  applyView(tView, lView, renderer, WalkTNodeTreeAction.Insert, parentNativeNode, beforeNode);\n}\n\n\n/**\n * Detach a `LView` from the DOM by detaching its nodes.\n *\n * @param tView The `TView' of the `LView` to be detached\n * @param lView the `LView` to be detached.\n */\nexport function detachViewFromDOM(tView: TView, lView: LView) {\n  applyView(tView, lView, lView[RENDERER], WalkTNodeTreeAction.Detach, null, null);\n}\n\n/**\n * Traverses down and up the tree of views and containers to remove listeners and\n * call onDestroy callbacks.\n *\n * Notes:\n *  - Because it's used for onDestroy calls, it needs to be bottom-up.\n *  - Must process containers instead of their views to avoid splicing\n *  when views are destroyed and re-added.\n *  - Using a while loop because it's faster than recursion\n *  - Destroy only called on movement to sibling or movement to parent (laterally or up)\n *\n *  @param rootView The view to destroy\n */\nexport function destroyViewTree(rootView: LView): void {\n  // If the view has no children, we can clean it up and return early.\n  let lViewOrLContainer = rootView[CHILD_HEAD];\n  if (!lViewOrLContainer) {\n    return cleanUpView(rootView[TVIEW], rootView);\n  }\n\n  while (lViewOrLContainer) {\n    let next: LView|LContainer|null = null;\n\n    if (isLView(lViewOrLContainer)) {\n      // If LView, traverse down to child.\n      next = lViewOrLContainer[CHILD_HEAD];\n    } else {\n      ngDevMode && assertLContainer(lViewOrLContainer);\n      // If container, traverse down to its first LView.\n      const firstView: LView|undefined = lViewOrLContainer[CONTAINER_HEADER_OFFSET];\n      if (firstView) next = firstView;\n    }\n\n    if (!next) {\n      // Only clean up view when moving to the side or up, as destroy hooks\n      // should be called in order from the bottom up.\n      while (lViewOrLContainer && !lViewOrLContainer![NEXT] && lViewOrLContainer !== rootView) {\n        if (isLView(lViewOrLContainer)) {\n          cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);\n        }\n        lViewOrLContainer = lViewOrLContainer[PARENT];\n      }\n      if (lViewOrLContainer === null) lViewOrLContainer = rootView;\n      if (isLView(lViewOrLContainer)) {\n        cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);\n      }\n      next = lViewOrLContainer && lViewOrLContainer![NEXT];\n    }\n    lViewOrLContainer = next;\n  }\n}\n\n/**\n * Inserts a view into a container.\n *\n * This adds the view to the container's array of active views in the correct\n * position. It also adds the view's elements to the DOM if the container isn't a\n * root node of another view (in that case, the view's elements will be added when\n * the container's parent view is added later).\n *\n * @param tView The `TView' of the `LView` to insert\n * @param lView The view to insert\n * @param lContainer The container into which the view should be inserted\n * @param index Which index in the container to insert the child view into\n */\nexport function insertView(tView: TView, lView: LView, lContainer: LContainer, index: number) {\n  ngDevMode && assertLView(lView);\n  ngDevMode && assertLContainer(lContainer);\n  const indexInContainer = CONTAINER_HEADER_OFFSET + index;\n  const containerLength = lContainer.length;\n\n  if (index > 0) {\n    // This is a new view, we need to add it to the children.\n    lContainer[indexInContainer - 1][NEXT] = lView;\n  }\n  if (index < containerLength - CONTAINER_HEADER_OFFSET) {\n    lView[NEXT] = lContainer[indexInContainer];\n    addToArray(lContainer, CONTAINER_HEADER_OFFSET + index, lView);\n  } else {\n    lContainer.push(lView);\n    lView[NEXT] = null;\n  }\n\n  lView[PARENT] = lContainer;\n\n  // track views where declaration and insertion points are different\n  const declarationLContainer = lView[DECLARATION_LCONTAINER];\n  if (declarationLContainer !== null && lContainer !== declarationLContainer) {\n    trackMovedView(declarationLContainer, lView);\n  }\n\n  // notify query that a new view has been added\n  const lQueries = lView[QUERIES];\n  if (lQueries !== null) {\n    lQueries.insertView(tView);\n  }\n\n  // Sets the attached flag\n  lView[FLAGS] |= LViewFlags.Attached;\n}\n\n/**\n * Track views created from the declaration container (TemplateRef) and inserted into a\n * different LContainer.\n */\nfunction trackMovedView(declarationContainer: LContainer, lView: LView) {\n  ngDevMode && assertDefined(lView, 'LView required');\n  ngDevMode && assertLContainer(declarationContainer);\n  const movedViews = declarationContainer[MOVED_VIEWS];\n  const insertedLContainer = lView[PARENT] as LContainer;\n  ngDevMode && assertLContainer(insertedLContainer);\n  const insertedComponentLView = insertedLContainer[PARENT]![DECLARATION_COMPONENT_VIEW];\n  ngDevMode && assertDefined(insertedComponentLView, 'Missing insertedComponentLView');\n  const declaredComponentLView = lView[DECLARATION_COMPONENT_VIEW];\n  ngDevMode && assertDefined(declaredComponentLView, 'Missing declaredComponentLView');\n  if (declaredComponentLView !== insertedComponentLView) {\n    // At this point the declaration-component is not same as insertion-component; this means that\n    // this is a transplanted view. Mark the declared lView as having transplanted views so that\n    // those views can participate in CD.\n    declarationContainer[HAS_TRANSPLANTED_VIEWS] = true;\n  }\n  if (movedViews === null) {\n    declarationContainer[MOVED_VIEWS] = [lView];\n  } else {\n    movedViews.push(lView);\n  }\n}\n\nfunction detachMovedView(declarationContainer: LContainer, lView: LView) {\n  ngDevMode && assertLContainer(declarationContainer);\n  ngDevMode &&\n      assertDefined(\n          declarationContainer[MOVED_VIEWS],\n          'A projected view should belong to a non-empty projected views collection');\n  const movedViews = declarationContainer[MOVED_VIEWS]!;\n  const declarationViewIndex = movedViews.indexOf(lView);\n  const insertionLContainer = lView[PARENT] as LContainer;\n  ngDevMode && assertLContainer(insertionLContainer);\n\n  // If the view was marked for refresh but then detached before it was checked (where the flag\n  // would be cleared and the counter decremented), we need to update the status here.\n  clearViewRefreshFlag(lView);\n\n  movedViews.splice(declarationViewIndex, 1);\n}\n\n/**\n * Detaches a view from a container.\n *\n * This method removes the view from the container's array of active views. It also\n * removes the view's elements from the DOM.\n *\n * @param lContainer The container from which to detach a view\n * @param removeIndex The index of the view to detach\n * @returns Detached LView instance.\n */\nexport function detachView(lContainer: LContainer, removeIndex: number): LView|undefined {\n  if (lContainer.length <= CONTAINER_HEADER_OFFSET) return;\n\n  const indexInContainer = CONTAINER_HEADER_OFFSET + removeIndex;\n  const viewToDetach = lContainer[indexInContainer];\n\n  if (viewToDetach) {\n    const declarationLContainer = viewToDetach[DECLARATION_LCONTAINER];\n    if (declarationLContainer !== null && declarationLContainer !== lContainer) {\n      detachMovedView(declarationLContainer, viewToDetach);\n    }\n\n\n    if (removeIndex > 0) {\n      lContainer[indexInContainer - 1][NEXT] = viewToDetach[NEXT] as LView;\n    }\n    const removedLView = removeFromArray(lContainer, CONTAINER_HEADER_OFFSET + removeIndex);\n    removeViewFromDOM(viewToDetach[TVIEW], viewToDetach);\n\n    // notify query that a view has been removed\n    const lQueries = removedLView[QUERIES];\n    if (lQueries !== null) {\n      lQueries.detachView(removedLView[TVIEW]);\n    }\n\n    viewToDetach[PARENT] = null;\n    viewToDetach[NEXT] = null;\n    // Unsets the attached flag\n    viewToDetach[FLAGS] &= ~LViewFlags.Attached;\n  }\n  return viewToDetach;\n}\n\n/**\n * A standalone function which destroys an LView,\n * conducting clean up (e.g. removing listeners, calling onDestroys).\n *\n * @param tView The `TView' of the `LView` to be destroyed\n * @param lView The view to be destroyed.\n */\nexport function destroyLView(tView: TView, lView: LView) {\n  if (!(lView[FLAGS] & LViewFlags.Destroyed)) {\n    const renderer = lView[RENDERER];\n\n    lView[REACTIVE_TEMPLATE_CONSUMER] && consumerDestroy(lView[REACTIVE_TEMPLATE_CONSUMER]);\n    lView[REACTIVE_HOST_BINDING_CONSUMER] && consumerDestroy(lView[REACTIVE_HOST_BINDING_CONSUMER]);\n\n    if (renderer.destroyNode) {\n      applyView(tView, lView, renderer, WalkTNodeTreeAction.Destroy, null, null);\n    }\n\n    destroyViewTree(lView);\n  }\n}\n\n/**\n * Calls onDestroys hooks for all directives and pipes in a given view and then removes all\n * listeners. Listeners are removed as the last step so events delivered in the onDestroys hooks\n * can be propagated to @Output listeners.\n *\n * @param tView `TView` for the `LView` to clean up.\n * @param lView The LView to clean up\n */\nfunction cleanUpView(tView: TView, lView: LView): void {\n  if (!(lView[FLAGS] & LViewFlags.Destroyed)) {\n    // Usually the Attached flag is removed when the view is detached from its parent, however\n    // if it's a root view, the flag won't be unset hence why we're also removing on destroy.\n    lView[FLAGS] &= ~LViewFlags.Attached;\n\n    // Mark the LView as destroyed *before* executing the onDestroy hooks. An onDestroy hook\n    // runs arbitrary user code, which could include its own `viewRef.destroy()` (or similar). If\n    // We don't flag the view as destroyed before the hooks, this could lead to an infinite loop.\n    // This also aligns with the ViewEngine behavior. It also means that the onDestroy hook is\n    // really more of an \"afterDestroy\" hook if you think about it.\n    lView[FLAGS] |= LViewFlags.Destroyed;\n\n    executeOnDestroys(tView, lView);\n    processCleanups(tView, lView);\n    // For component views only, the local renderer is destroyed at clean up time.\n    if (lView[TVIEW].type === TViewType.Component) {\n      ngDevMode && ngDevMode.rendererDestroy++;\n      lView[RENDERER].destroy();\n    }\n\n    const declarationContainer = lView[DECLARATION_LCONTAINER];\n    // we are dealing with an embedded view that is still inserted into a container\n    if (declarationContainer !== null && isLContainer(lView[PARENT])) {\n      // and this is a projected view\n      if (declarationContainer !== lView[PARENT]) {\n        detachMovedView(declarationContainer, lView);\n      }\n\n      // For embedded views still attached to a container: remove query result from this view.\n      const lQueries = lView[QUERIES];\n      if (lQueries !== null) {\n        lQueries.detachView(tView);\n      }\n    }\n\n    // Unregister the view once everything else has been cleaned up.\n    unregisterLView(lView);\n  }\n}\n\n/** Removes listeners and unsubscribes from output subscriptions */\nfunction processCleanups(tView: TView, lView: LView): void {\n  const tCleanup = tView.cleanup;\n  const lCleanup = lView[CLEANUP]!;\n  if (tCleanup !== null) {\n    for (let i = 0; i < tCleanup.length - 1; i += 2) {\n      if (typeof tCleanup[i] === 'string') {\n        // This is a native DOM listener. It will occupy 4 entries in the TCleanup array (hence i +=\n        // 2 at the end of this block).\n        const targetIdx = tCleanup[i + 3];\n        ngDevMode && assertNumber(targetIdx, 'cleanup target must be a number');\n        if (targetIdx >= 0) {\n          // unregister\n          lCleanup[targetIdx]();\n        } else {\n          // Subscription\n          lCleanup[-targetIdx].unsubscribe();\n        }\n        i += 2;\n      } else {\n        // This is a cleanup function that is grouped with the index of its context\n        const context = lCleanup[tCleanup[i + 1]];\n        tCleanup[i].call(context);\n      }\n    }\n  }\n  if (lCleanup !== null) {\n    lView[CLEANUP] = null;\n  }\n  const destroyHooks = lView[ON_DESTROY_HOOKS];\n  if (destroyHooks !== null) {\n    // Reset the ON_DESTROY_HOOKS array before iterating over it to prevent hooks that unregister\n    // themselves from mutating the array during iteration.\n    lView[ON_DESTROY_HOOKS] = null;\n    for (let i = 0; i < destroyHooks.length; i++) {\n      const destroyHooksFn = destroyHooks[i];\n      ngDevMode && assertFunction(destroyHooksFn, 'Expecting destroy hook to be a function.');\n      destroyHooksFn();\n    }\n  }\n}\n\n/** Calls onDestroy hooks for this view */\nfunction executeOnDestroys(tView: TView, lView: LView): void {\n  let destroyHooks: DestroyHookData|null;\n\n  if (tView != null && (destroyHooks = tView.destroyHooks) != null) {\n    for (let i = 0; i < destroyHooks.length; i += 2) {\n      const context = lView[destroyHooks[i] as number];\n\n      // Only call the destroy hook if the context has been requested.\n      if (!(context instanceof NodeInjectorFactory)) {\n        const toCall = destroyHooks[i + 1] as HookFn | HookData;\n\n        if (Array.isArray(toCall)) {\n          for (let j = 0; j < toCall.length; j += 2) {\n            const callContext = context[toCall[j] as number];\n            const hook = toCall[j + 1] as HookFn;\n            profiler(ProfilerEvent.LifecycleHookStart, callContext, hook);\n            try {\n              hook.call(callContext);\n            } finally {\n              profiler(ProfilerEvent.LifecycleHookEnd, callContext, hook);\n            }\n          }\n        } else {\n          profiler(ProfilerEvent.LifecycleHookStart, context, toCall);\n          try {\n            toCall.call(context);\n          } finally {\n            profiler(ProfilerEvent.LifecycleHookEnd, context, toCall);\n          }\n        }\n      }\n    }\n  }\n}\n\n/**\n * Returns a native element if a node can be inserted into the given parent.\n *\n * There are two reasons why we may not be able to insert a element immediately.\n * - Projection: When creating a child content element of a component, we have to skip the\n *   insertion because the content of a component will be projected.\n *   `<component><content>delayed due to projection</content></component>`\n * - Parent container is disconnected: This can happen when we are inserting a view into\n *   parent container, which itself is disconnected. For example the parent container is part\n *   of a View which has not be inserted or is made for projection but has not been inserted\n *   into destination.\n *\n * @param tView: Current `TView`.\n * @param tNode: `TNode` for which we wish to retrieve render parent.\n * @param lView: Current `LView`.\n */\nexport function getParentRElement(tView: TView, tNode: TNode, lView: LView): RElement|null {\n  return getClosestRElement(tView, tNode.parent, lView);\n}\n\n/**\n * Get closest `RElement` or `null` if it can't be found.\n *\n * If `TNode` is `TNodeType.Element` => return `RElement` at `LView[tNode.index]` location.\n * If `TNode` is `TNodeType.ElementContainer|IcuContain` => return the parent (recursively).\n * If `TNode` is `null` then return host `RElement`:\n *   - return `null` if projection\n *   - return `null` if parent container is disconnected (we have no parent.)\n *\n * @param tView: Current `TView`.\n * @param tNode: `TNode` for which we wish to retrieve `RElement` (or `null` if host element is\n *     needed).\n * @param lView: Current `LView`.\n * @returns `null` if the `RElement` can't be determined at this time (no parent / projection)\n */\nexport function getClosestRElement(tView: TView, tNode: TNode|null, lView: LView): RElement|null {\n  let parentTNode: TNode|null = tNode;\n  // Skip over element and ICU containers as those are represented by a comment node and\n  // can't be used as a render parent.\n  while (parentTNode !== null &&\n         (parentTNode.type & (TNodeType.ElementContainer | TNodeType.Icu))) {\n    tNode = parentTNode;\n    parentTNode = tNode.parent;\n  }\n\n  // If the parent tNode is null, then we are inserting across views: either into an embedded view\n  // or a component view.\n  if (parentTNode === null) {\n    // We are inserting a root element of the component view into the component host element and\n    // it should always be eager.\n    return lView[HOST];\n  } else {\n    ngDevMode && assertTNodeType(parentTNode, TNodeType.AnyRNode | TNodeType.Container);\n    const {componentOffset} = parentTNode;\n    if (componentOffset > -1) {\n      ngDevMode && assertTNodeForLView(parentTNode, lView);\n      const {encapsulation} =\n          (tView.data[parentTNode.directiveStart + componentOffset] as ComponentDef<unknown>);\n      // We've got a parent which is an element in the current view. We just need to verify if the\n      // parent element is not a component. Component's content nodes are not inserted immediately\n      // because they will be projected, and so doing insert at this point would be wasteful.\n      // Since the projection would then move it to its final destination. Note that we can't\n      // make this assumption when using the Shadow DOM, because the native projection placeholders\n      // (<content> or <slot>) have to be in place as elements are being inserted.\n      if (encapsulation === ViewEncapsulation.None ||\n          encapsulation === ViewEncapsulation.Emulated) {\n        return null;\n      }\n    }\n\n    return getNativeByTNode(parentTNode, lView) as RElement;\n  }\n}\n\n/**\n * Inserts a native node before another native node for a given parent.\n * This is a utility function that can be used when native nodes were determined.\n */\nexport function nativeInsertBefore(\n    renderer: Renderer, parent: RElement, child: RNode, beforeNode: RNode|null,\n    isMove: boolean): void {\n  ngDevMode && ngDevMode.rendererInsertBefore++;\n  renderer.insertBefore(parent, child, beforeNode, isMove);\n}\n\nfunction nativeAppendChild(renderer: Renderer, parent: RElement, child: RNode): void {\n  ngDevMode && ngDevMode.rendererAppendChild++;\n  ngDevMode && assertDefined(parent, 'parent node must be defined');\n  renderer.appendChild(parent, child);\n}\n\nfunction nativeAppendOrInsertBefore(\n    renderer: Renderer, parent: RElement, child: RNode, beforeNode: RNode|null, isMove: boolean) {\n  if (beforeNode !== null) {\n    nativeInsertBefore(renderer, parent, child, beforeNode, isMove);\n  } else {\n    nativeAppendChild(renderer, parent, child);\n  }\n}\n\n/** Removes a node from the DOM given its native parent. */\nfunction nativeRemoveChild(\n    renderer: Renderer, parent: RElement, child: RNode, isHostElement?: boolean): void {\n  renderer.removeChild(parent, child, isHostElement);\n}\n\n/** Checks if an element is a `<template>` node. */\nfunction isTemplateNode(node: RElement): node is RTemplate {\n  return node.tagName === 'TEMPLATE' && (node as RTemplate).content !== undefined;\n}\n\n/**\n * Returns a native parent of a given native node.\n */\nexport function nativeParentNode(renderer: Renderer, node: RNode): RElement|null {\n  return renderer.parentNode(node);\n}\n\n/**\n * Returns a native sibling of a given native node.\n */\nexport function nativeNextSibling(renderer: Renderer, node: RNode): RNode|null {\n  return renderer.nextSibling(node);\n}\n\n/**\n * Find a node in front of which `currentTNode` should be inserted.\n *\n * This method determines the `RNode` in front of which we should insert the `currentRNode`. This\n * takes `TNode.insertBeforeIndex` into account if i18n code has been invoked.\n *\n * @param parentTNode parent `TNode`\n * @param currentTNode current `TNode` (The node which we would like to insert into the DOM)\n * @param lView current `LView`\n */\nfunction getInsertInFrontOfRNode(parentTNode: TNode, currentTNode: TNode, lView: LView): RNode|\n    null {\n  return _getInsertInFrontOfRNodeWithI18n(parentTNode, currentTNode, lView);\n}\n\n\n/**\n * Find a node in front of which `currentTNode` should be inserted. (Does not take i18n into\n * account)\n *\n * This method determines the `RNode` in front of which we should insert the `currentRNode`. This\n * does not take `TNode.insertBeforeIndex` into account.\n *\n * @param parentTNode parent `TNode`\n * @param currentTNode current `TNode` (The node which we would like to insert into the DOM)\n * @param lView current `LView`\n */\nexport function getInsertInFrontOfRNodeWithNoI18n(\n    parentTNode: TNode, currentTNode: TNode, lView: LView): RNode|null {\n  if (parentTNode.type & (TNodeType.ElementContainer | TNodeType.Icu)) {\n    return getNativeByTNode(parentTNode, lView);\n  }\n  return null;\n}\n\n/**\n * Tree shakable boundary for `getInsertInFrontOfRNodeWithI18n` function.\n *\n * This function will only be set if i18n code runs.\n */\nlet _getInsertInFrontOfRNodeWithI18n: (parentTNode: TNode, currentTNode: TNode, lView: LView) =>\n    RNode | null = getInsertInFrontOfRNodeWithNoI18n;\n\n/**\n * Tree shakable boundary for `processI18nInsertBefore` function.\n *\n * This function will only be set if i18n code runs.\n */\nlet _processI18nInsertBefore: (\n    renderer: Renderer, childTNode: TNode, lView: LView, childRNode: RNode|RNode[],\n    parentRElement: RElement|null) => void;\n\nexport function setI18nHandling(\n    getInsertInFrontOfRNodeWithI18n: (parentTNode: TNode, currentTNode: TNode, lView: LView) =>\n        RNode | null,\n    processI18nInsertBefore: (\n        renderer: Renderer, childTNode: TNode, lView: LView, childRNode: RNode|RNode[],\n        parentRElement: RElement|null) => void) {\n  _getInsertInFrontOfRNodeWithI18n = getInsertInFrontOfRNodeWithI18n;\n  _processI18nInsertBefore = processI18nInsertBefore;\n}\n\n/**\n * Appends the `child` native node (or a collection of nodes) to the `parent`.\n *\n * @param tView The `TView' to be appended\n * @param lView The current LView\n * @param childRNode The native child (or children) that should be appended\n * @param childTNode The TNode of the child element\n */\nexport function appendChild(\n    tView: TView, lView: LView, childRNode: RNode|RNode[], childTNode: TNode): void {\n  const parentRNode = getParentRElement(tView, childTNode, lView);\n  const renderer = lView[RENDERER];\n  const parentTNode: TNode = childTNode.parent || lView[T_HOST]!;\n  const anchorNode = getInsertInFrontOfRNode(parentTNode, childTNode, lView);\n  if (parentRNode != null) {\n    if (Array.isArray(childRNode)) {\n      for (let i = 0; i < childRNode.length; i++) {\n        nativeAppendOrInsertBefore(renderer, parentRNode, childRNode[i], anchorNode, false);\n      }\n    } else {\n      nativeAppendOrInsertBefore(renderer, parentRNode, childRNode, anchorNode, false);\n    }\n  }\n\n  _processI18nInsertBefore !== undefined &&\n      _processI18nInsertBefore(renderer, childTNode, lView, childRNode, parentRNode);\n}\n\n/**\n * Returns the first native node for a given LView, starting from the provided TNode.\n *\n * Native nodes are returned in the order in which those appear in the native tree (DOM).\n */\nexport function getFirstNativeNode(lView: LView, tNode: TNode|null): RNode|null {\n  if (tNode !== null) {\n    ngDevMode &&\n        assertTNodeType(\n            tNode,\n            TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Icu | TNodeType.Projection);\n\n    const tNodeType = tNode.type;\n    if (tNodeType & TNodeType.AnyRNode) {\n      return getNativeByTNode(tNode, lView);\n    } else if (tNodeType & TNodeType.Container) {\n      return getBeforeNodeForView(-1, lView[tNode.index]);\n    } else if (tNodeType & TNodeType.ElementContainer) {\n      const elIcuContainerChild = tNode.child;\n      if (elIcuContainerChild !== null) {\n        return getFirstNativeNode(lView, elIcuContainerChild);\n      } else {\n        const rNodeOrLContainer = lView[tNode.index];\n        if (isLContainer(rNodeOrLContainer)) {\n          return getBeforeNodeForView(-1, rNodeOrLContainer);\n        } else {\n          return unwrapRNode(rNodeOrLContainer);\n        }\n      }\n    } else if (tNodeType & TNodeType.Icu) {\n      let nextRNode = icuContainerIterate(tNode as TIcuContainerNode, lView);\n      let rNode: RNode|null = nextRNode();\n      // If the ICU container has no nodes, than we use the ICU anchor as the node.\n      return rNode || unwrapRNode(lView[tNode.index]);\n    } else {\n      const projectionNodes = getProjectionNodes(lView, tNode);\n      if (projectionNodes !== null) {\n        if (Array.isArray(projectionNodes)) {\n          return projectionNodes[0];\n        }\n        const parentView = getLViewParent(lView[DECLARATION_COMPONENT_VIEW]);\n        ngDevMode && assertParentView(parentView);\n        return getFirstNativeNode(parentView!, projectionNodes);\n      } else {\n        return getFirstNativeNode(lView, tNode.next);\n      }\n    }\n  }\n\n  return null;\n}\n\nexport function getProjectionNodes(lView: LView, tNode: TNode|null): TNode|RNode[]|null {\n  if (tNode !== null) {\n    const componentView = lView[DECLARATION_COMPONENT_VIEW];\n    const componentHost = componentView[T_HOST] as TElementNode;\n    const slotIdx = tNode.projection as number;\n    ngDevMode && assertProjectionSlots(lView);\n    return componentHost.projection![slotIdx];\n  }\n  return null;\n}\n\nexport function getBeforeNodeForView(viewIndexInContainer: number, lContainer: LContainer): RNode|\n    null {\n  const nextViewIndex = CONTAINER_HEADER_OFFSET + viewIndexInContainer + 1;\n  if (nextViewIndex < lContainer.length) {\n    const lView = lContainer[nextViewIndex] as LView;\n    const firstTNodeOfView = lView[TVIEW].firstChild;\n    if (firstTNodeOfView !== null) {\n      return getFirstNativeNode(lView, firstTNodeOfView);\n    }\n  }\n\n  return lContainer[NATIVE];\n}\n\n/**\n * Removes a native node itself using a given renderer. To remove the node we are looking up its\n * parent from the native tree as not all platforms / browsers support the equivalent of\n * node.remove().\n *\n * @param renderer A renderer to be used\n * @param rNode The native node that should be removed\n * @param isHostElement A flag indicating if a node to be removed is a host of a component.\n */\nexport function nativeRemoveNode(renderer: Renderer, rNode: RNode, isHostElement?: boolean): void {\n  ngDevMode && ngDevMode.rendererRemoveNode++;\n  const nativeParent = nativeParentNode(renderer, rNode);\n  if (nativeParent) {\n    nativeRemoveChild(renderer, nativeParent, rNode, isHostElement);\n  }\n}\n\n/**\n * Clears the contents of a given RElement.\n *\n * @param rElement the native RElement to be cleared\n */\nexport function clearElementContents(rElement: RElement): void {\n  rElement.textContent = '';\n}\n\n\n/**\n * Performs the operation of `action` on the node. Typically this involves inserting or removing\n * nodes on the LView or projection boundary.\n */\nfunction applyNodes(\n    renderer: Renderer, action: WalkTNodeTreeAction, tNode: TNode|null, lView: LView,\n    parentRElement: RElement|null, beforeNode: RNode|null, isProjection: boolean) {\n  while (tNode != null) {\n    ngDevMode && assertTNodeForLView(tNode, lView);\n    ngDevMode &&\n        assertTNodeType(\n            tNode,\n            TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Projection | TNodeType.Icu);\n    const rawSlotValue = lView[tNode.index];\n    const tNodeType = tNode.type;\n    if (isProjection) {\n      if (action === WalkTNodeTreeAction.Create) {\n        rawSlotValue && attachPatchData(unwrapRNode(rawSlotValue), lView);\n        tNode.flags |= TNodeFlags.isProjected;\n      }\n    }\n    if ((tNode.flags & TNodeFlags.isDetached) !== TNodeFlags.isDetached) {\n      if (tNodeType & TNodeType.ElementContainer) {\n        applyNodes(renderer, action, tNode.child, lView, parentRElement, beforeNode, false);\n        applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);\n      } else if (tNodeType & TNodeType.Icu) {\n        const nextRNode = icuContainerIterate(tNode as TIcuContainerNode, lView);\n        let rNode: RNode|null;\n        while (rNode = nextRNode()) {\n          applyToElementOrContainer(action, renderer, parentRElement, rNode, beforeNode);\n        }\n        applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);\n      } else if (tNodeType & TNodeType.Projection) {\n        applyProjectionRecursive(\n            renderer, action, lView, tNode as TProjectionNode, parentRElement, beforeNode);\n      } else {\n        ngDevMode && assertTNodeType(tNode, TNodeType.AnyRNode | TNodeType.Container);\n        applyToElementOrContainer(action, renderer, parentRElement, rawSlotValue, beforeNode);\n      }\n    }\n    tNode = isProjection ? tNode.projectionNext : tNode.next;\n  }\n}\n\n\n/**\n * `applyView` performs operation on the view as specified in `action` (insert, detach, destroy)\n *\n * Inserting a view without projection or containers at top level is simple. Just iterate over the\n * root nodes of the View, and for each node perform the `action`.\n *\n * Things get more complicated with containers and projections. That is because coming across:\n * - Container: implies that we have to insert/remove/destroy the views of that container as well\n *              which in turn can have their own Containers at the View roots.\n * - Projection: implies that we have to insert/remove/destroy the nodes of the projection. The\n *               complication is that the nodes we are projecting can themselves have Containers\n *               or other Projections.\n *\n * As you can see this is a very recursive problem. Yes recursion is not most efficient but the\n * code is complicated enough that trying to implemented with recursion becomes unmaintainable.\n *\n * @param tView The `TView' which needs to be inserted, detached, destroyed\n * @param lView The LView which needs to be inserted, detached, destroyed.\n * @param renderer Renderer to use\n * @param action action to perform (insert, detach, destroy)\n * @param parentRElement parent DOM element for insertion (Removal does not need it).\n * @param beforeNode Before which node the insertions should happen.\n */\nfunction applyView(\n    tView: TView, lView: LView, renderer: Renderer, action: WalkTNodeTreeAction.Destroy,\n    parentRElement: null, beforeNode: null): void;\nfunction applyView(\n    tView: TView, lView: LView, renderer: Renderer, action: WalkTNodeTreeAction,\n    parentRElement: RElement|null, beforeNode: RNode|null): void;\nfunction applyView(\n    tView: TView, lView: LView, renderer: Renderer, action: WalkTNodeTreeAction,\n    parentRElement: RElement|null, beforeNode: RNode|null): void {\n  applyNodes(renderer, action, tView.firstChild, lView, parentRElement, beforeNode, false);\n}\n\n/**\n * `applyProjection` performs operation on the projection.\n *\n * Inserting a projection requires us to locate the projected nodes from the parent component. The\n * complication is that those nodes themselves could be re-projected from their parent component.\n *\n * @param tView The `TView` of `LView` which needs to be inserted, detached, destroyed\n * @param lView The `LView` which needs to be inserted, detached, destroyed.\n * @param tProjectionNode node to project\n */\nexport function applyProjection(tView: TView, lView: LView, tProjectionNode: TProjectionNode) {\n  const renderer = lView[RENDERER];\n  const parentRNode = getParentRElement(tView, tProjectionNode, lView);\n  const parentTNode = tProjectionNode.parent || lView[T_HOST]!;\n  let beforeNode = getInsertInFrontOfRNode(parentTNode, tProjectionNode, lView);\n  applyProjectionRecursive(\n      renderer, WalkTNodeTreeAction.Create, lView, tProjectionNode, parentRNode, beforeNode);\n}\n\n/**\n * `applyProjectionRecursive` performs operation on the projection specified by `action` (insert,\n * detach, destroy)\n *\n * Inserting a projection requires us to locate the projected nodes from the parent component. The\n * complication is that those nodes themselves could be re-projected from their parent component.\n *\n * @param renderer Render to use\n * @param action action to perform (insert, detach, destroy)\n * @param lView The LView which needs to be inserted, detached, destroyed.\n * @param tProjectionNode node to project\n * @param parentRElement parent DOM element for insertion/removal.\n * @param beforeNode Before which node the insertions should happen.\n */\nfunction applyProjectionRecursive(\n    renderer: Renderer, action: WalkTNodeTreeAction, lView: LView, tProjectionNode: TProjectionNode,\n    parentRElement: RElement|null, beforeNode: RNode|null) {\n  const componentLView = lView[DECLARATION_COMPONENT_VIEW];\n  const componentNode = componentLView[T_HOST] as TElementNode;\n  ngDevMode &&\n      assertEqual(typeof tProjectionNode.projection, 'number', 'expecting projection index');\n  const nodeToProjectOrRNodes = componentNode.projection![tProjectionNode.projection]!;\n  if (Array.isArray(nodeToProjectOrRNodes)) {\n    // This should not exist, it is a bit of a hack. When we bootstrap a top level node and we\n    // need to support passing projectable nodes, so we cheat and put them in the TNode\n    // of the Host TView. (Yes we put instance info at the T Level). We can get away with it\n    // because we know that that TView is not shared and therefore it will not be a problem.\n    // This should be refactored and cleaned up.\n    for (let i = 0; i < nodeToProjectOrRNodes.length; i++) {\n      const rNode = nodeToProjectOrRNodes[i];\n      applyToElementOrContainer(action, renderer, parentRElement, rNode, beforeNode);\n    }\n  } else {\n    let nodeToProject: TNode|null = nodeToProjectOrRNodes;\n    const projectedComponentLView = componentLView[PARENT] as LView;\n    // If a parent <ng-content> is located within a skip hydration block,\n    // annotate an actual node that is being projected with the same flag too.\n    if (hasInSkipHydrationBlockFlag(tProjectionNode)) {\n      nodeToProject.flags |= TNodeFlags.inSkipHydrationBlock;\n    }\n    applyNodes(\n        renderer, action, nodeToProject, projectedComponentLView, parentRElement, beforeNode, true);\n  }\n}\n\n\n/**\n * `applyContainer` performs an operation on the container and its views as specified by\n * `action` (insert, detach, destroy)\n *\n * Inserting a Container is complicated by the fact that the container may have Views which\n * themselves have containers or projections.\n *\n * @param renderer Renderer to use\n * @param action action to perform (insert, detach, destroy)\n * @param lContainer The LContainer which needs to be inserted, detached, destroyed.\n * @param parentRElement parent DOM element for insertion/removal.\n * @param beforeNode Before which node the insertions should happen.\n */\nfunction applyContainer(\n    renderer: Renderer, action: WalkTNodeTreeAction, lContainer: LContainer,\n    parentRElement: RElement|null, beforeNode: RNode|null|undefined) {\n  ngDevMode && assertLContainer(lContainer);\n  const anchor = lContainer[NATIVE];  // LContainer has its own before node.\n  const native = unwrapRNode(lContainer);\n  // An LContainer can be created dynamically on any node by injecting ViewContainerRef.\n  // Asking for a ViewContainerRef on an element will result in a creation of a separate anchor\n  // node (comment in the DOM) that will be different from the LContainer's host node. In this\n  // particular case we need to execute action on 2 nodes:\n  // - container's host node (this is done in the executeActionOnElementOrContainer)\n  // - container's host node (this is done here)\n  if (anchor !== native) {\n    // This is very strange to me (Misko). I would expect that the native is same as anchor. I\n    // don't see a reason why they should be different, but they are.\n    //\n    // If they are we need to process the second anchor as well.\n    applyToElementOrContainer(action, renderer, parentRElement, anchor, beforeNode);\n  }\n  for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {\n    const lView = lContainer[i] as LView;\n    applyView(lView[TVIEW], lView, renderer, action, parentRElement, anchor);\n  }\n}\n\n/**\n * Writes class/style to element.\n *\n * @param renderer Renderer to use.\n * @param isClassBased `true` if it should be written to `class` (`false` to write to `style`)\n * @param rNode The Node to write to.\n * @param prop Property to write to. This would be the class/style name.\n * @param value Value to write. If `null`/`undefined`/`false` this is considered a remove (set/add\n *        otherwise).\n */\nexport function applyStyling(\n    renderer: Renderer, isClassBased: boolean, rNode: RElement, prop: string, value: any) {\n  if (isClassBased) {\n    // We actually want JS true/false here because any truthy value should add the class\n    if (!value) {\n      ngDevMode && ngDevMode.rendererRemoveClass++;\n      renderer.removeClass(rNode, prop);\n    } else {\n      ngDevMode && ngDevMode.rendererAddClass++;\n      renderer.addClass(rNode, prop);\n    }\n  } else {\n    let flags = prop.indexOf('-') === -1 ? undefined : RendererStyleFlags2.DashCase as number;\n    if (value == null /** || value === undefined */) {\n      ngDevMode && ngDevMode.rendererRemoveStyle++;\n      renderer.removeStyle(rNode, prop, flags);\n    } else {\n      // A value is important if it ends with `!important`. The style\n      // parser strips any semicolons at the end of the value.\n      const isImportant = typeof value === 'string' ? value.endsWith('!important') : false;\n\n      if (isImportant) {\n        // !important has to be stripped from the value for it to be valid.\n        value = value.slice(0, -10);\n        flags! |= RendererStyleFlags2.Important;\n      }\n\n      ngDevMode && ngDevMode.rendererSetStyle++;\n      renderer.setStyle(rNode, prop, value, flags);\n    }\n  }\n}\n\n\n/**\n * Write `cssText` to `RElement`.\n *\n * This function does direct write without any reconciliation. Used for writing initial values, so\n * that static styling values do not pull in the style parser.\n *\n * @param renderer Renderer to use\n * @param element The element which needs to be updated.\n * @param newValue The new class list to write.\n */\nexport function writeDirectStyle(renderer: Renderer, element: RElement, newValue: string) {\n  ngDevMode && assertString(newValue, '\\'newValue\\' should be a string');\n  renderer.setAttribute(element, 'style', newValue);\n  ngDevMode && ngDevMode.rendererSetStyle++;\n}\n\n/**\n * Write `className` to `RElement`.\n *\n * This function does direct write without any reconciliation. Used for writing initial values, so\n * that static styling values do not pull in the style parser.\n *\n * @param renderer Renderer to use\n * @param element The element which needs to be updated.\n * @param newValue The new class list to write.\n */\nexport function writeDirectClass(renderer: Renderer, element: RElement, newValue: string) {\n  ngDevMode && assertString(newValue, '\\'newValue\\' should be a string');\n  if (newValue === '') {\n    // There are tests in `google3` which expect `element.getAttribute('class')` to be `null`.\n    renderer.removeAttribute(element, 'class');\n  } else {\n    renderer.setAttribute(element, 'class', newValue);\n  }\n  ngDevMode && ngDevMode.rendererSetClassName++;\n}\n\n/** Sets up the static DOM attributes on an `RNode`. */\nexport function setupStaticAttributes(renderer: Renderer, element: RElement, tNode: TNode) {\n  const {mergedAttrs, classes, styles} = tNode;\n\n  if (mergedAttrs !== null) {\n    setUpAttributes(renderer, element, mergedAttrs);\n  }\n\n  if (classes !== null) {\n    writeDirectClass(renderer, element, classes);\n  }\n\n  if (styles !== null) {\n    writeDirectStyle(renderer, element, styles);\n  }\n}\n"]}