@angular/core
Version:
Angular - the core framework
461 lines • 70.7 kB
JavaScript
/**
* @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 { inject, Injector } from '../di';
import { isRootTemplateMessage } from '../render3/i18n/i18n_util';
import { createIcuIterator } from '../render3/instructions/i18n_icu_container_visitor';
import { isTNodeShape } from '../render3/interfaces/node';
import { HEADER_OFFSET, HYDRATION, RENDERER, TVIEW } from '../render3/interfaces/view';
import { getFirstNativeNode, nativeRemoveNode } from '../render3/node_manipulation';
import { unwrapRNode } from '../render3/util/view_utils';
import { assertDefined, assertNotEqual } from '../util/assert';
import { I18N_DATA } from './interfaces';
import { isDisconnectedRNode, locateNextRNode, tryLocateRNodeByPath } from './node_lookup_utils';
import { IS_I18N_HYDRATION_ENABLED } from './tokens';
import { getNgContainerSize, initDisconnectedNodes, isSerializedElementContainer, processTextNodeBeforeSerialization, } from './utils';
let _isI18nHydrationSupportEnabled = false;
let _prepareI18nBlockForHydrationImpl = () => {
// noop unless `enablePrepareI18nBlockForHydrationImpl` is invoked.
};
export function setIsI18nHydrationSupportEnabled(enabled) {
_isI18nHydrationSupportEnabled = enabled;
}
export function isI18nHydrationSupportEnabled() {
return _isI18nHydrationSupportEnabled;
}
/**
* Prepares an i18n block and its children, located at the given
* view and instruction index, for hydration.
*
* @param lView lView with the i18n block
* @param index index of the i18n block in the lView
* @param parentTNode TNode of the parent of the i18n block
* @param subTemplateIndex sub-template index, or -1 for the main template
*/
export function prepareI18nBlockForHydration(lView, index, parentTNode, subTemplateIndex) {
_prepareI18nBlockForHydrationImpl(lView, index, parentTNode, subTemplateIndex);
}
export function enablePrepareI18nBlockForHydrationImpl() {
_prepareI18nBlockForHydrationImpl = prepareI18nBlockForHydrationImpl;
}
export function isI18nHydrationEnabled(injector) {
injector = injector ?? inject(Injector);
return injector.get(IS_I18N_HYDRATION_ENABLED, false);
}
/**
* Collects, if not already cached, all of the indices in the
* given TView which are children of an i18n block.
*
* Since i18n blocks don't introduce a parent TNode, this is necessary
* in order to determine which indices in a LView are translated.
*/
export function getOrComputeI18nChildren(tView, context) {
let i18nChildren = context.i18nChildren.get(tView);
if (i18nChildren === undefined) {
i18nChildren = collectI18nChildren(tView);
context.i18nChildren.set(tView, i18nChildren);
}
return i18nChildren;
}
function collectI18nChildren(tView) {
const children = new Set();
function collectI18nViews(node) {
children.add(node.index);
switch (node.kind) {
case 1 /* I18nNodeKind.ELEMENT */:
case 2 /* I18nNodeKind.PLACEHOLDER */: {
for (const childNode of node.children) {
collectI18nViews(childNode);
}
break;
}
case 3 /* I18nNodeKind.ICU */: {
for (const caseNodes of node.cases) {
for (const caseNode of caseNodes) {
collectI18nViews(caseNode);
}
}
break;
}
}
}
// Traverse through the AST of each i18n block in the LView,
// and collect every instruction index.
for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
const tI18n = tView.data[i];
if (!tI18n || !tI18n.ast) {
continue;
}
for (const node of tI18n.ast) {
collectI18nViews(node);
}
}
return children.size === 0 ? null : children;
}
/**
* Attempts to serialize i18n data for an i18n block, located at
* the given view and instruction index.
*
* @param lView lView with the i18n block
* @param index index of the i18n block in the lView
* @param context the hydration context
* @returns the i18n data, or null if there is no relevant data
*/
export function trySerializeI18nBlock(lView, index, context) {
if (!context.isI18nHydrationEnabled) {
return null;
}
const tView = lView[TVIEW];
const tI18n = tView.data[index];
if (!tI18n || !tI18n.ast) {
return null;
}
const serializedI18nBlock = {
caseQueue: [],
disconnectedNodes: new Set(),
disjointNodes: new Set(),
};
serializeI18nBlock(lView, serializedI18nBlock, context, tI18n.ast);
return serializedI18nBlock.caseQueue.length === 0 &&
serializedI18nBlock.disconnectedNodes.size === 0 &&
serializedI18nBlock.disjointNodes.size === 0
? null
: serializedI18nBlock;
}
function serializeI18nBlock(lView, serializedI18nBlock, context, nodes) {
let prevRNode = null;
for (const node of nodes) {
const nextRNode = serializeI18nNode(lView, serializedI18nBlock, context, node);
if (nextRNode) {
if (isDisjointNode(prevRNode, nextRNode)) {
serializedI18nBlock.disjointNodes.add(node.index - HEADER_OFFSET);
}
prevRNode = nextRNode;
}
}
return prevRNode;
}
/**
* Helper to determine whether the given nodes are "disjoint".
*
* The i18n hydration process walks through the DOM and i18n nodes
* at the same time. It expects the sibling DOM node of the previous
* i18n node to be the first node of the next i18n node.
*
* In cases of content projection, this won't always be the case. So
* when we detect that, we mark the node as "disjoint", ensuring that
* we will serialize the path to the node. This way, when we hydrate the
* i18n node, we will be able to find the correct place to start.
*/
function isDisjointNode(prevNode, nextNode) {
return prevNode && prevNode.nextSibling !== nextNode;
}
/**
* Process the given i18n node for serialization.
* Returns the first RNode for the i18n node to begin hydration.
*/
function serializeI18nNode(lView, serializedI18nBlock, context, node) {
const maybeRNode = unwrapRNode(lView[node.index]);
if (!maybeRNode || isDisconnectedRNode(maybeRNode)) {
serializedI18nBlock.disconnectedNodes.add(node.index - HEADER_OFFSET);
return null;
}
const rNode = maybeRNode;
switch (node.kind) {
case 0 /* I18nNodeKind.TEXT */: {
processTextNodeBeforeSerialization(context, rNode);
break;
}
case 1 /* I18nNodeKind.ELEMENT */:
case 2 /* I18nNodeKind.PLACEHOLDER */: {
serializeI18nBlock(lView, serializedI18nBlock, context, node.children);
break;
}
case 3 /* I18nNodeKind.ICU */: {
const currentCase = lView[node.currentCaseLViewIndex];
if (currentCase != null) {
// i18n uses a negative value to signal a change to a new case, so we
// need to invert it to get the proper value.
const caseIdx = currentCase < 0 ? ~currentCase : currentCase;
serializedI18nBlock.caseQueue.push(caseIdx);
serializeI18nBlock(lView, serializedI18nBlock, context, node.cases[caseIdx]);
}
break;
}
}
return getFirstNativeNodeForI18nNode(lView, node);
}
/**
* Helper function to get the first native node to begin hydrating
* the given i18n node.
*/
function getFirstNativeNodeForI18nNode(lView, node) {
const tView = lView[TVIEW];
const maybeTNode = tView.data[node.index];
if (isTNodeShape(maybeTNode)) {
// If the node is backed by an actual TNode, we can simply delegate.
return getFirstNativeNode(lView, maybeTNode);
}
else if (node.kind === 3 /* I18nNodeKind.ICU */) {
// A nested ICU container won't have an actual TNode. In that case, we can use
// an iterator to find the first child.
const icuIterator = createIcuIterator(maybeTNode, lView);
let rNode = icuIterator();
// If the ICU container has no nodes, then we use the ICU anchor as the node.
return rNode ?? unwrapRNode(lView[node.index]);
}
else {
// Otherwise, the node is a text or trivial element in an ICU container,
// and we can just use the RNode directly.
return unwrapRNode(lView[node.index]) ?? null;
}
}
function setCurrentNode(state, node) {
state.currentNode = node;
}
/**
* Marks the current RNode as the hydration root for the given
* AST node.
*/
function appendI18nNodeToCollection(context, state, astNode) {
const noOffsetIndex = astNode.index - HEADER_OFFSET;
const { disconnectedNodes } = context;
const currentNode = state.currentNode;
if (state.isConnected) {
context.i18nNodes.set(noOffsetIndex, currentNode);
// We expect the node to be connected, so ensure that it
// is not in the set, regardless of whether we found it,
// so that the downstream error handling can provide the
// proper context.
disconnectedNodes.delete(noOffsetIndex);
}
else {
disconnectedNodes.add(noOffsetIndex);
}
return currentNode;
}
/**
* Skip over some sibling nodes during hydration.
*
* Note: we use this instead of `siblingAfter` as it's expected that
* sometimes we might encounter null nodes. In those cases, we want to
* defer to downstream error handling to provide proper context.
*/
function skipSiblingNodes(state, skip) {
let currentNode = state.currentNode;
for (let i = 0; i < skip; i++) {
if (!currentNode) {
break;
}
currentNode = currentNode?.nextSibling ?? null;
}
return currentNode;
}
/**
* Fork the given state into a new state for hydrating children.
*/
function forkHydrationState(state, nextNode) {
return { currentNode: nextNode, isConnected: state.isConnected };
}
function prepareI18nBlockForHydrationImpl(lView, index, parentTNode, subTemplateIndex) {
if (!isI18nHydrationSupportEnabled()) {
return;
}
const hydrationInfo = lView[HYDRATION];
if (!hydrationInfo) {
return;
}
const tView = lView[TVIEW];
const tI18n = tView.data[index];
ngDevMode &&
assertDefined(tI18n, 'Expected i18n data to be present in a given TView slot during hydration');
function findHydrationRoot() {
if (isRootTemplateMessage(subTemplateIndex)) {
// This is the root of an i18n block. In this case, our hydration root will
// depend on where our parent TNode (i.e. the block with i18n applied) is
// in the DOM.
ngDevMode && assertDefined(parentTNode, 'Expected parent TNode while hydrating i18n root');
const rootNode = locateNextRNode(hydrationInfo, tView, lView, parentTNode);
// If this i18n block is attached to an <ng-container>, then we want to begin
// hydrating directly with the RNode. Otherwise, for a TNode with a physical DOM
// element, we want to recurse into the first child and begin there.
return parentTNode.type & 8 /* TNodeType.ElementContainer */ ? rootNode : rootNode.firstChild;
}
// This is a nested template in an i18n block. In this case, the entire view
// is translated, and part of a dehydrated view in a container. This means that
// we can simply begin hydration with the first dehydrated child.
return hydrationInfo?.firstChild;
}
const currentNode = findHydrationRoot();
ngDevMode && assertDefined(currentNode, 'Expected root i18n node during hydration');
const disconnectedNodes = initDisconnectedNodes(hydrationInfo) ?? new Set();
const i18nNodes = (hydrationInfo.i18nNodes ??= new Map());
const caseQueue = hydrationInfo.data[I18N_DATA]?.[index - HEADER_OFFSET] ?? [];
const dehydratedIcuData = (hydrationInfo.dehydratedIcuData ??= new Map());
collectI18nNodesFromDom({ hydrationInfo, lView, i18nNodes, disconnectedNodes, caseQueue, dehydratedIcuData }, { currentNode, isConnected: true }, tI18n.ast);
// Nodes from inactive ICU cases should be considered disconnected. We track them above
// because they aren't (and shouldn't be) serialized. Since we may mutate or create a
// new set, we need to be sure to write the expected value back to the DehydratedView.
hydrationInfo.disconnectedNodes = disconnectedNodes.size === 0 ? null : disconnectedNodes;
}
function collectI18nNodesFromDom(context, state, nodeOrNodes) {
if (Array.isArray(nodeOrNodes)) {
let nextState = state;
for (const node of nodeOrNodes) {
// Whenever a node doesn't directly follow the previous RNode, it
// is given a path. We need to resume collecting nodes from that location
// until and unless we find another disjoint node.
const targetNode = tryLocateRNodeByPath(context.hydrationInfo, context.lView, node.index - HEADER_OFFSET);
if (targetNode) {
nextState = forkHydrationState(state, targetNode);
}
collectI18nNodesFromDom(context, nextState, node);
}
}
else {
if (context.disconnectedNodes.has(nodeOrNodes.index - HEADER_OFFSET)) {
// i18n nodes can be considered disconnected if e.g. they were projected.
// In that case, we have to make sure to skip over them.
return;
}
switch (nodeOrNodes.kind) {
case 0 /* I18nNodeKind.TEXT */: {
// Claim a text node for hydration
const currentNode = appendI18nNodeToCollection(context, state, nodeOrNodes);
setCurrentNode(state, currentNode?.nextSibling ?? null);
break;
}
case 1 /* I18nNodeKind.ELEMENT */: {
// Recurse into the current element's children...
collectI18nNodesFromDom(context, forkHydrationState(state, state.currentNode?.firstChild ?? null), nodeOrNodes.children);
// And claim the parent element itself.
const currentNode = appendI18nNodeToCollection(context, state, nodeOrNodes);
setCurrentNode(state, currentNode?.nextSibling ?? null);
break;
}
case 2 /* I18nNodeKind.PLACEHOLDER */: {
const noOffsetIndex = nodeOrNodes.index - HEADER_OFFSET;
const { hydrationInfo } = context;
const containerSize = getNgContainerSize(hydrationInfo, noOffsetIndex);
switch (nodeOrNodes.type) {
case 0 /* I18nPlaceholderType.ELEMENT */: {
// Hydration expects to find the head of the element.
const currentNode = appendI18nNodeToCollection(context, state, nodeOrNodes);
// A TNode for the node may not yet if we're hydrating during the first pass,
// so use the serialized data to determine if this is an <ng-container>.
if (isSerializedElementContainer(hydrationInfo, noOffsetIndex)) {
// An <ng-container> doesn't have a physical DOM node, so we need to
// continue hydrating from siblings.
collectI18nNodesFromDom(context, state, nodeOrNodes.children);
// Skip over the anchor element. It will be claimed by the
// downstream container hydration.
const nextNode = skipSiblingNodes(state, 1);
setCurrentNode(state, nextNode);
}
else {
// Non-container elements represent an actual node in the DOM, so we
// need to continue hydration with the children, and claim the node.
collectI18nNodesFromDom(context, forkHydrationState(state, state.currentNode?.firstChild ?? null), nodeOrNodes.children);
setCurrentNode(state, currentNode?.nextSibling ?? null);
// Elements can also be the anchor of a view container, so there may
// be elements after this node that we need to skip.
if (containerSize !== null) {
// `+1` stands for an anchor node after all of the views in the container.
const nextNode = skipSiblingNodes(state, containerSize + 1);
setCurrentNode(state, nextNode);
}
}
break;
}
case 1 /* I18nPlaceholderType.SUBTEMPLATE */: {
ngDevMode &&
assertNotEqual(containerSize, null, 'Expected a container size while hydrating i18n subtemplate');
// Hydration expects to find the head of the template.
appendI18nNodeToCollection(context, state, nodeOrNodes);
// Skip over all of the template children, as well as the anchor
// node, since the template itself will handle them instead.
const nextNode = skipSiblingNodes(state, containerSize + 1);
setCurrentNode(state, nextNode);
break;
}
}
break;
}
case 3 /* I18nNodeKind.ICU */: {
// If the current node is connected, we need to pop the next case from the
// queue, so that the active case is also considered connected.
const selectedCase = state.isConnected ? context.caseQueue.shift() : null;
const childState = { currentNode: null, isConnected: false };
// We traverse through each case, even if it's not active,
// so that we correctly populate disconnected nodes.
for (let i = 0; i < nodeOrNodes.cases.length; i++) {
collectI18nNodesFromDom(context, i === selectedCase ? state : childState, nodeOrNodes.cases[i]);
}
if (selectedCase !== null) {
// ICUs represent a branching state, and the selected case could be different
// than what it was on the server. In that case, we need to be able to clean
// up the nodes from the original case. To do that, we store the selected case.
context.dehydratedIcuData.set(nodeOrNodes.index, { case: selectedCase, node: nodeOrNodes });
}
// Hydration expects to find the ICU anchor element.
const currentNode = appendI18nNodeToCollection(context, state, nodeOrNodes);
setCurrentNode(state, currentNode?.nextSibling ?? null);
break;
}
}
}
}
let _claimDehydratedIcuCaseImpl = () => {
// noop unless `enableClaimDehydratedIcuCaseImpl` is invoked
};
/**
* Mark the case for the ICU node at the given index in the view as claimed,
* allowing its nodes to be hydrated and not cleaned up.
*/
export function claimDehydratedIcuCase(lView, icuIndex, caseIndex) {
_claimDehydratedIcuCaseImpl(lView, icuIndex, caseIndex);
}
export function enableClaimDehydratedIcuCaseImpl() {
_claimDehydratedIcuCaseImpl = claimDehydratedIcuCaseImpl;
}
function claimDehydratedIcuCaseImpl(lView, icuIndex, caseIndex) {
const dehydratedIcuDataMap = lView[HYDRATION]?.dehydratedIcuData;
if (dehydratedIcuDataMap) {
const dehydratedIcuData = dehydratedIcuDataMap.get(icuIndex);
if (dehydratedIcuData?.case === caseIndex) {
// If the case we're attempting to claim matches the dehydrated one,
// we remove it from the map to mark it as "claimed."
dehydratedIcuDataMap.delete(icuIndex);
}
}
}
/**
* Clean up all i18n hydration data associated with the given view.
*/
export function cleanupI18nHydrationData(lView) {
const hydrationInfo = lView[HYDRATION];
if (hydrationInfo) {
const { i18nNodes, dehydratedIcuData: dehydratedIcuDataMap } = hydrationInfo;
if (i18nNodes && dehydratedIcuDataMap) {
const renderer = lView[RENDERER];
for (const dehydratedIcuData of dehydratedIcuDataMap.values()) {
cleanupDehydratedIcuData(renderer, i18nNodes, dehydratedIcuData);
}
}
hydrationInfo.i18nNodes = undefined;
hydrationInfo.dehydratedIcuData = undefined;
}
}
function cleanupDehydratedIcuData(renderer, i18nNodes, dehydratedIcuData) {
for (const node of dehydratedIcuData.node.cases[dehydratedIcuData.case]) {
const rNode = i18nNodes.get(node.index - HEADER_OFFSET);
if (rNode) {
nativeRemoveNode(renderer, rNode, false);
}
}
}
//# 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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 {inject, Injector} from '../di';\nimport {isRootTemplateMessage} from '../render3/i18n/i18n_util';\nimport {createIcuIterator} from '../render3/instructions/i18n_icu_container_visitor';\nimport {I18nNode, I18nNodeKind, I18nPlaceholderType, TI18n, TIcu} from '../render3/interfaces/i18n';\nimport {isTNodeShape, TNode, TNodeType} from '../render3/interfaces/node';\nimport type {Renderer} from '../render3/interfaces/renderer';\nimport type {RNode} from '../render3/interfaces/renderer_dom';\nimport {HEADER_OFFSET, HYDRATION, LView, RENDERER, TView, TVIEW} from '../render3/interfaces/view';\nimport {getFirstNativeNode, nativeRemoveNode} from '../render3/node_manipulation';\nimport {unwrapRNode} from '../render3/util/view_utils';\nimport {assertDefined, assertNotEqual} from 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*\n * @param lView lView with the i18n block\n * @param index index of the i18n block in the lView\n * @param parentTNode TNode of the parent of the i18n block\n * @param subTemplateIndex sub-template index, or -1 for the main template\n */\nexport function prepareI18nBlockForHydration(\n  lView: LView,\n  index: number,\n  parentTNode: TNode | null,\n  subTemplateIndex: number,\n): void {\n  _prepareI18nBlockForHydrationImpl(lView, index, parentTNode, subTemplateIndex);\n}\n\nexport function enablePrepareI18nBlockForHydrationImpl() {\n  _prepareI18nBlockForHydrationImpl = prepareI18nBlockForHydrationImpl;\n}\n\nexport function isI18nHydrationEnabled(injector?: Injector) {\n  injector = injector ?? inject(Injector);\n  return injector.get(IS_I18N_HYDRATION_ENABLED, false);\n}\n\n/**\n * Collects, if not already cached, all of the indices in the\n * given TView which are children of an i18n block.\n *\n * Since i18n blocks don't introduce a parent TNode, this is necessary\n * in order to determine which indices in a LView are translated.\n */\nexport function getOrComputeI18nChildren(\n  tView: TView,\n  context: HydrationContext,\n): Set<number> | null {\n  let i18nChildren = context.i18nChildren.get(tView);\n  if (i18nChildren === undefined) {\n    i18nChildren = collectI18nChildren(tView);\n    context.i18nChildren.set(tView, i18nChildren);\n  }\n  return i18nChildren;\n}\n\nfunction collectI18nChildren(tView: TView): Set<number> | null {\n  const children = new Set<number>();\n\n  function collectI18nViews(node: I18nNode) {\n    children.add(node.index);\n\n    switch (node.kind) {\n      case I18nNodeKind.ELEMENT:\n      case I18nNodeKind.PLACEHOLDER: {\n        for (const childNode of node.children) {\n          collectI18nViews(childNode);\n        }\n        break;\n      }\n\n      case I18nNodeKind.ICU: {\n        for (const caseNodes of node.cases) {\n          for (const caseNode of caseNodes) {\n            collectI18nViews(caseNode);\n          }\n        }\n        break;\n      }\n    }\n  }\n\n  // Traverse through the AST of each i18n block in the LView,\n  // and collect every instruction index.\n  for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {\n    const tI18n = tView.data[i] as TI18n | undefined;\n    if (!tI18n || !tI18n.ast) {\n      continue;\n    }\n\n    for (const node of tI18n.ast) {\n      collectI18nViews(node);\n    }\n  }\n\n  return children.size === 0 ? null : children;\n}\n\n/**\n * Resulting data from serializing an i18n block.\n */\nexport interface SerializedI18nBlock {\n  /**\n   * A queue of active ICU cases from a depth-first traversal\n   * of the i18n AST. This is serialized to the client in order\n   * to correctly associate DOM nodes with i18n nodes during\n   * hydration.\n   */\n  caseQueue: Array<number>;\n\n  /**\n   * A set of indices in the lView of the block for nodes\n   * that are disconnected from the DOM. In i18n, this can\n   * happen when using content projection but some nodes are\n   * not selected by an <ng-content />.\n   */\n  disconnectedNodes: Set<number>;\n\n  /**\n   * A set of indices in the lView of the block for nodes\n   * considered \"disjoint\", indicating that we need to serialize\n   * a path to the node in order to hydrate it.\n   *\n   * A node is considered disjoint when its RNode does not\n   * directly follow the RNode of the previous i18n node, for\n   * example, because of content projection.\n   */\n  disjointNodes: Set<number>;\n}\n\n/**\n * Attempts to serialize i18n data for an i18n block, located at\n * the given view and instruction index.\n *\n * @param lView lView with the i18n block\n * @param index index of the i18n block in the lView\n * @param context the hydration context\n * @returns the i18n data, or null if there is no relevant data\n */\nexport function trySerializeI18nBlock(\n  lView: LView,\n  index: number,\n  context: HydrationContext,\n): SerializedI18nBlock | null {\n  if (!context.isI18nHydrationEnabled) {\n    return null;\n  }\n\n  const tView = lView[TVIEW];\n  const tI18n = tView.data[index] as TI18n | undefined;\n  if (!tI18n || !tI18n.ast) {\n    return null;\n  }\n\n  const serializedI18nBlock: SerializedI18nBlock = {\n    caseQueue: [],\n    disconnectedNodes: new Set(),\n    disjointNodes: new Set(),\n  };\n  serializeI18nBlock(lView, serializedI18nBlock, context, tI18n.ast);\n\n  return serializedI18nBlock.caseQueue.length === 0 &&\n    serializedI18nBlock.disconnectedNodes.size === 0 &&\n    serializedI18nBlock.disjointNodes.size === 0\n    ? null\n    : serializedI18nBlock;\n}\n\nfunction serializeI18nBlock(\n  lView: LView,\n  serializedI18nBlock: SerializedI18nBlock,\n  context: HydrationContext,\n  nodes: I18nNode[],\n): Node | null {\n  let prevRNode = null;\n  for (const node of nodes) {\n    const nextRNode = serializeI18nNode(lView, serializedI18nBlock, context, node);\n    if (nextRNode) {\n      if (isDisjointNode(prevRNode, nextRNode)) {\n        serializedI18nBlock.disjointNodes.add(node.index - HEADER_OFFSET);\n      }\n      prevRNode = nextRNode;\n    }\n  }\n  return prevRNode;\n}\n\n/**\n * Helper to determine whether the given nodes are \"disjoint\".\n *\n * The i18n hydration process walks through the DOM and i18n nodes\n * at the same time. It expects the sibling DOM node of the previous\n * i18n node to be the first node of the next i18n node.\n *\n * In cases of content projection, this won't always be the case. So\n * when we detect that, we mark the node as \"disjoint\", ensuring that\n * we will serialize the path to the node. This way, when we hydrate the\n * i18n node, we will be able to find the correct place to start.\n */\nfunction isDisjointNode(prevNode: Node | null, nextNode: Node) {\n  return prevNode && prevNode.nextSibling !== nextNode;\n}\n\n/**\n * Process the given i18n node for serialization.\n * Returns the first RNode for the i18n node to begin hydration.\n */\nfunction serializeI18nNode(\n  lView: LView,\n  serializedI18nBlock: SerializedI18nBlock,\n  context: HydrationContext,\n  node: I18nNode,\n): Node | null {\n  const maybeRNode = unwrapRNode(lView[node.index]!);\n  if (!maybeRNode