How to use reconcileChildrenIterator method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactChildFiber.old.js

Source:ReactChildFiber.old.js Github

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...502 // search but that's unusual. Besides, for the two ended optimization to503 // work on Iterables, we'd need to copy the whole set.504 // In this first iteration, we'll just live with hitting the bad case505 // (adding everything to a Map) in for every insert/move.506 // If you change this code, also update reconcileChildrenIterator() which507 // uses the same algorithm.508 {509 // First, validate keys.510 var knownKeys = null;511 for (var i = 0; i < newChildren.length; i++) {512 var child = newChildren[i];513 knownKeys = warnOnInvalidKey(child, knownKeys, returnFiber);514 }515 }516 var resultingFirstChild = null;517 var previousNewFiber = null;518 var oldFiber = currentFirstChild;519 var lastPlacedIndex = 0;520 var newIdx = 0;521 var nextOldFiber = null;522 for (; oldFiber !== null && newIdx < newChildren.length; newIdx++) {523 if (oldFiber.index > newIdx) {524 nextOldFiber = oldFiber;525 oldFiber = null;526 } else {527 nextOldFiber = oldFiber.sibling;528 }529 var newFiber = updateSlot(returnFiber, oldFiber, newChildren[newIdx], lanes);530 if (newFiber === null) {531 // TODO: This breaks on empty slots like null children. That's532 // unfortunate because it triggers the slow path all the time. We need533 // a better way to communicate whether this was a miss or null,534 // boolean, undefined, etc.535 if (oldFiber === null) {536 oldFiber = nextOldFiber;537 }538 break;539 }540 if (shouldTrackSideEffects) {541 if (oldFiber && newFiber.alternate === null) {542 // We matched the slot, but we didn't reuse the existing fiber, so we543 // need to delete the existing child.544 deleteChild(returnFiber, oldFiber);545 }546 }547 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);548 if (previousNewFiber === null) {549 // TODO: Move out of the loop. This only happens for the first run.550 resultingFirstChild = newFiber;551 } else {552 // TODO: Defer siblings if we're not at the right index for this slot.553 // I.e. if we had null values before, then we want to defer this554 // for each null value. However, we also don't want to call updateSlot555 // with the previous one.556 previousNewFiber.sibling = newFiber;557 }558 previousNewFiber = newFiber;559 oldFiber = nextOldFiber;560 }561 if (newIdx === newChildren.length) {562 // We've reached the end of the new children. We can delete the rest.563 deleteRemainingChildren(returnFiber, oldFiber);564 return resultingFirstChild;565 }566 if (oldFiber === null) {567 // If we don't have any more existing children we can choose a fast path568 // since the rest will all be insertions.569 for (; newIdx < newChildren.length; newIdx++) {570 var _newFiber = createChild(returnFiber, newChildren[newIdx], lanes);571 if (_newFiber === null) {572 continue;573 }574 lastPlacedIndex = placeChild(_newFiber, lastPlacedIndex, newIdx);575 if (previousNewFiber === null) {576 // TODO: Move out of the loop. This only happens for the first run.577 resultingFirstChild = _newFiber;578 } else {579 previousNewFiber.sibling = _newFiber;580 }581 previousNewFiber = _newFiber;582 }583 return resultingFirstChild;584 } // Add all children to a key map for quick lookups.585 var existingChildren = mapRemainingChildren(returnFiber, oldFiber); // Keep scanning and use the map to restore deleted items as moves.586 for (; newIdx < newChildren.length; newIdx++) {587 var _newFiber2 = updateFromMap(existingChildren, returnFiber, newIdx, newChildren[newIdx], lanes);588 if (_newFiber2 !== null) {589 if (shouldTrackSideEffects) {590 if (_newFiber2.alternate !== null) {591 // The new fiber is a work in progress, but if there exists a592 // current, that means that we reused the fiber. We need to delete593 // it from the child list so that we don't add it to the deletion594 // list.595 existingChildren.delete(_newFiber2.key === null ? newIdx : _newFiber2.key);596 }597 }598 lastPlacedIndex = placeChild(_newFiber2, lastPlacedIndex, newIdx);599 if (previousNewFiber === null) {600 resultingFirstChild = _newFiber2;601 } else {602 previousNewFiber.sibling = _newFiber2;603 }604 previousNewFiber = _newFiber2;605 }606 }607 if (shouldTrackSideEffects) {608 // Any existing children that weren't consumed above were deleted. We need609 // to add them to the deletion list.610 existingChildren.forEach(function (child) {611 return deleteChild(returnFiber, child);612 });613 }614 return resultingFirstChild;615 }616 function reconcileChildrenIterator(returnFiber, currentFirstChild, newChildrenIterable, lanes) {617 // This is the same implementation as reconcileChildrenArray(),618 // but using the iterator instead.619 var iteratorFn = getIteratorFn(newChildrenIterable);620 if (!(typeof iteratorFn === 'function')) {621 {622 throw Error( "An object is not an iterable. This error is likely caused by a bug in React. Please file an issue." );623 }624 }625 {626 // We don't support rendering Generators because it's a mutation.627 // See https://github.com/facebook/react/issues/12995628 if (typeof Symbol === 'function' && // $FlowFixMe Flow doesn't know about toStringTag629 newChildrenIterable[Symbol.toStringTag] === 'Generator') {630 if (!didWarnAboutGenerators) {631 error('Using Generators as children is unsupported and will likely yield ' + 'unexpected results because enumerating a generator mutates it. ' + 'You may convert it to an array with `Array.from()` or the ' + '`[...spread]` operator before rendering. Keep in mind ' + 'you might need to polyfill these features for older browsers.');632 }633 didWarnAboutGenerators = true;634 } // Warn about using Maps as children635 if (newChildrenIterable.entries === iteratorFn) {636 if (!didWarnAboutMaps) {637 error('Using Maps as children is not supported. ' + 'Use an array of keyed ReactElements instead.');638 }639 didWarnAboutMaps = true;640 } // First, validate keys.641 // We'll get a different iterator later for the main pass.642 var _newChildren = iteratorFn.call(newChildrenIterable);643 if (_newChildren) {644 var knownKeys = null;645 var _step = _newChildren.next();646 for (; !_step.done; _step = _newChildren.next()) {647 var child = _step.value;648 knownKeys = warnOnInvalidKey(child, knownKeys, returnFiber);649 }650 }651 }652 var newChildren = iteratorFn.call(newChildrenIterable);653 if (!(newChildren != null)) {654 {655 throw Error( "An iterable object provided no iterator." );656 }657 }658 var resultingFirstChild = null;659 var previousNewFiber = null;660 var oldFiber = currentFirstChild;661 var lastPlacedIndex = 0;662 var newIdx = 0;663 var nextOldFiber = null;664 var step = newChildren.next();665 for (; oldFiber !== null && !step.done; newIdx++, step = newChildren.next()) {666 if (oldFiber.index > newIdx) {667 nextOldFiber = oldFiber;668 oldFiber = null;669 } else {670 nextOldFiber = oldFiber.sibling;671 }672 var newFiber = updateSlot(returnFiber, oldFiber, step.value, lanes);673 if (newFiber === null) {674 // TODO: This breaks on empty slots like null children. That's675 // unfortunate because it triggers the slow path all the time. We need676 // a better way to communicate whether this was a miss or null,677 // boolean, undefined, etc.678 if (oldFiber === null) {679 oldFiber = nextOldFiber;680 }681 break;682 }683 if (shouldTrackSideEffects) {684 if (oldFiber && newFiber.alternate === null) {685 // We matched the slot, but we didn't reuse the existing fiber, so we686 // need to delete the existing child.687 deleteChild(returnFiber, oldFiber);688 }689 }690 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);691 if (previousNewFiber === null) {692 // TODO: Move out of the loop. This only happens for the first run.693 resultingFirstChild = newFiber;694 } else {695 // TODO: Defer siblings if we're not at the right index for this slot.696 // I.e. if we had null values before, then we want to defer this697 // for each null value. However, we also don't want to call updateSlot698 // with the previous one.699 previousNewFiber.sibling = newFiber;700 }701 previousNewFiber = newFiber;702 oldFiber = nextOldFiber;703 }704 if (step.done) {705 // We've reached the end of the new children. We can delete the rest.706 deleteRemainingChildren(returnFiber, oldFiber);707 return resultingFirstChild;708 }709 if (oldFiber === null) {710 // If we don't have any more existing children we can choose a fast path711 // since the rest will all be insertions.712 for (; !step.done; newIdx++, step = newChildren.next()) {713 var _newFiber3 = createChild(returnFiber, step.value, lanes);714 if (_newFiber3 === null) {715 continue;716 }717 lastPlacedIndex = placeChild(_newFiber3, lastPlacedIndex, newIdx);718 if (previousNewFiber === null) {719 // TODO: Move out of the loop. This only happens for the first run.720 resultingFirstChild = _newFiber3;721 } else {722 previousNewFiber.sibling = _newFiber3;723 }724 previousNewFiber = _newFiber3;725 }726 return resultingFirstChild;727 } // Add all children to a key map for quick lookups.728 var existingChildren = mapRemainingChildren(returnFiber, oldFiber); // Keep scanning and use the map to restore deleted items as moves.729 for (; !step.done; newIdx++, step = newChildren.next()) {730 var _newFiber4 = updateFromMap(existingChildren, returnFiber, newIdx, step.value, lanes);731 if (_newFiber4 !== null) {732 if (shouldTrackSideEffects) {733 if (_newFiber4.alternate !== null) {734 // The new fiber is a work in progress, but if there exists a735 // current, that means that we reused the fiber. We need to delete736 // it from the child list so that we don't add it to the deletion737 // list.738 existingChildren.delete(_newFiber4.key === null ? newIdx : _newFiber4.key);739 }740 }741 lastPlacedIndex = placeChild(_newFiber4, lastPlacedIndex, newIdx);742 if (previousNewFiber === null) {743 resultingFirstChild = _newFiber4;744 } else {745 previousNewFiber.sibling = _newFiber4;746 }747 previousNewFiber = _newFiber4;748 }749 }750 if (shouldTrackSideEffects) {751 // Any existing children that weren't consumed above were deleted. We need752 // to add them to the deletion list.753 existingChildren.forEach(function (child) {754 return deleteChild(returnFiber, child);755 });756 }757 return resultingFirstChild;758 }759 function reconcileSingleTextNode(returnFiber, currentFirstChild, textContent, lanes) {760 // There's no need to check for keys on text nodes since we don't have a761 // way to define them.762 if (currentFirstChild !== null && currentFirstChild.tag === HostText) {763 // We already have an existing node so let's just update it and delete764 // the rest.765 deleteRemainingChildren(returnFiber, currentFirstChild.sibling);766 var existing = useFiber(currentFirstChild, textContent);767 existing.return = returnFiber;768 return existing;769 } // The existing first child is not a text node so we need to create one770 // and delete the existing ones.771 deleteRemainingChildren(returnFiber, currentFirstChild);772 var created = createFiberFromText(textContent, returnFiber.mode, lanes);773 created.return = returnFiber;774 return created;775 }776 function reconcileSingleElement(returnFiber, currentFirstChild, element, lanes) {777 var key = element.key;778 var child = currentFirstChild;779 while (child !== null) {780 // TODO: If key === null and child.key === null, then this only applies to781 // the first item in the list.782 if (child.key === key) {783 switch (child.tag) {784 case Fragment:785 {786 if (element.type === REACT_FRAGMENT_TYPE) {787 deleteRemainingChildren(returnFiber, child.sibling);788 var existing = useFiber(child, element.props.children);789 existing.return = returnFiber;790 {791 existing._debugSource = element._source;792 existing._debugOwner = element._owner;793 }794 return existing;795 }796 break;797 }798 case Block:799 {800 var type = element.type;801 if (type.$$typeof === REACT_LAZY_TYPE) {802 type = resolveLazyType(type);803 }804 if (type.$$typeof === REACT_BLOCK_TYPE) {805 // The new Block might not be initialized yet. We need to initialize806 // it in case initializing it turns out it would match.807 if (type._render === child.type._render) {808 deleteRemainingChildren(returnFiber, child.sibling);809 var _existing2 = useFiber(child, element.props);810 _existing2.type = type;811 _existing2.return = returnFiber;812 {813 _existing2._debugSource = element._source;814 _existing2._debugOwner = element._owner;815 }816 return _existing2;817 }818 }819 }820 // We intentionally fallthrough here if enableBlocksAPI is not on.821 // eslint-disable-next-lined no-fallthrough822 default:823 {824 if (child.elementType === element.type || ( // Keep this check inline so it only runs on the false path:825 isCompatibleFamilyForHotReloading(child, element) )) {826 deleteRemainingChildren(returnFiber, child.sibling);827 var _existing3 = useFiber(child, element.props);828 _existing3.ref = coerceRef(returnFiber, child, element);829 _existing3.return = returnFiber;830 {831 _existing3._debugSource = element._source;832 _existing3._debugOwner = element._owner;833 }834 return _existing3;835 }836 break;837 }838 } // Didn't match.839 deleteRemainingChildren(returnFiber, child);840 break;841 } else {842 deleteChild(returnFiber, child);843 }844 child = child.sibling;845 }846 if (element.type === REACT_FRAGMENT_TYPE) {847 var created = createFiberFromFragment(element.props.children, returnFiber.mode, lanes, element.key);848 created.return = returnFiber;849 return created;850 } else {851 var _created4 = createFiberFromElement(element, returnFiber.mode, lanes);852 _created4.ref = coerceRef(returnFiber, currentFirstChild, element);853 _created4.return = returnFiber;854 return _created4;855 }856 }857 function reconcileSinglePortal(returnFiber, currentFirstChild, portal, lanes) {858 var key = portal.key;859 var child = currentFirstChild;860 while (child !== null) {861 // TODO: If key === null and child.key === null, then this only applies to862 // the first item in the list.863 if (child.key === key) {864 if (child.tag === HostPortal && child.stateNode.containerInfo === portal.containerInfo && child.stateNode.implementation === portal.implementation) {865 deleteRemainingChildren(returnFiber, child.sibling);866 var existing = useFiber(child, portal.children || []);867 existing.return = returnFiber;868 return existing;869 } else {870 deleteRemainingChildren(returnFiber, child);871 break;872 }873 } else {874 deleteChild(returnFiber, child);875 }876 child = child.sibling;877 }878 var created = createFiberFromPortal(portal, returnFiber.mode, lanes);879 created.return = returnFiber;880 return created;881 } // This API will tag the children with the side-effect of the reconciliation882 // itself. They will be added to the side-effect list as we pass through the883 // children and the parent.884 function reconcileChildFibers(returnFiber, currentFirstChild, newChild, lanes) {885 // This function is not recursive.886 // If the top level item is an array, we treat it as a set of children,887 // not as a fragment. Nested arrays on the other hand will be treated as888 // fragment nodes. Recursion happens at the normal flow.889 // Handle top level unkeyed fragments as if they were arrays.890 // This leads to an ambiguity between <>{[...]}</> and <>...</>.891 // We treat the ambiguous cases above the same.892 var isUnkeyedTopLevelFragment = typeof newChild === 'object' && newChild !== null && newChild.type === REACT_FRAGMENT_TYPE && newChild.key === null;893 if (isUnkeyedTopLevelFragment) {894 newChild = newChild.props.children;895 } // Handle object types896 var isObject = typeof newChild === 'object' && newChild !== null;897 if (isObject) {898 switch (newChild.$$typeof) {899 case REACT_ELEMENT_TYPE:900 return placeSingleChild(reconcileSingleElement(returnFiber, currentFirstChild, newChild, lanes));901 case REACT_PORTAL_TYPE:902 return placeSingleChild(reconcileSinglePortal(returnFiber, currentFirstChild, newChild, lanes));903 case REACT_LAZY_TYPE:904 {905 var payload = newChild._payload;906 var init = newChild._init; // TODO: This function is supposed to be non-recursive.907 return reconcileChildFibers(returnFiber, currentFirstChild, init(payload), lanes);908 }909 }910 }911 if (typeof newChild === 'string' || typeof newChild === 'number') {912 return placeSingleChild(reconcileSingleTextNode(returnFiber, currentFirstChild, '' + newChild, lanes));913 }914 if (isArray$1(newChild)) {915 return reconcileChildrenArray(returnFiber, currentFirstChild, newChild, lanes);916 }917 if (getIteratorFn(newChild)) {918 return reconcileChildrenIterator(returnFiber, currentFirstChild, newChild, lanes);919 }920 if (isObject) {921 throwOnInvalidObjectType(returnFiber, newChild);922 }923 {924 if (typeof newChild === 'function') {925 warnOnFunctionType(returnFiber);926 }927 }928 if (typeof newChild === 'undefined' && !isUnkeyedTopLevelFragment) {929 // If the new child is undefined, and the return fiber is a composite930 // component, throw an error. If Fiber return types are disabled,931 // we already threw above.932 switch (returnFiber.tag) {...

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reconcile.js

Source:reconcile.js Github

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...698 // search but that's unusual. Besides, for the two ended optimization to699 // work on Iterables, we'd need to copy the whole set.700 // In this first iteration, we'll just live with hitting the bad case701 // (adding everything to a Map) in for every insert/move.702 // If you change this code, also update reconcileChildrenIterator() which703 // uses the same algorithm.704 if (__DEV__) {705 // First, validate keys.706 let knownKeys = null;707 for (let i = 0; i < newChildren.length; i++) {708 const child = newChildren[i];709 knownKeys = warnOnInvalidKey(child, knownKeys);710 }711 }712 let resultingFirstChild: Fiber | null = null;713 let previousNewFiber: Fiber | null = null;714 let oldFiber = currentFirstChild;715 let lastPlacedIndex = 0;716 let newIdx = 0;717 let nextOldFiber = null;718 for (; oldFiber !== null && newIdx < newChildren.length; newIdx++) {719 if (oldFiber.index > newIdx) {720 nextOldFiber = oldFiber;721 oldFiber = null;722 } else {723 nextOldFiber = oldFiber.sibling;724 }725 const newFiber = updateSlot(726 returnFiber,727 oldFiber,728 newChildren[newIdx],729 expirationTime,730 );731 if (newFiber === null) {732 // TODO: This breaks on empty slots like null children. That's733 // unfortunate because it triggers the slow path all the time. We need734 // a better way to communicate whether this was a miss or null,735 // boolean, undefined, etc.736 if (oldFiber === null) {737 oldFiber = nextOldFiber;738 }739 break;740 }741 if (shouldTrackSideEffects) {742 if (oldFiber && newFiber.alternate === null) {743 // We matched the slot, but we didn't reuse the existing fiber, so we744 // need to delete the existing child.745 deleteChild(returnFiber, oldFiber);746 }747 }748 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);749 if (previousNewFiber === null) {750 // TODO: Move out of the loop. This only happens for the first run.751 resultingFirstChild = newFiber;752 } else {753 // TODO: Defer siblings if we're not at the right index for this slot.754 // I.e. if we had null values before, then we want to defer this755 // for each null value. However, we also don't want to call updateSlot756 // with the previous one.757 previousNewFiber.sibling = newFiber;758 }759 previousNewFiber = newFiber;760 oldFiber = nextOldFiber;761 }762 if (newIdx === newChildren.length) {763 // We've reached the end of the new children. We can delete the rest.764 deleteRemainingChildren(returnFiber, oldFiber);765 return resultingFirstChild;766 }767 if (oldFiber === null) {768 // If we don't have any more existing children we can choose a fast path769 // since the rest will all be insertions.770 for (; newIdx < newChildren.length; newIdx++) {771 const newFiber = createChild(772 returnFiber,773 newChildren[newIdx],774 expirationTime,775 );776 if (newFiber === null) {777 continue;778 }779 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);780 if (previousNewFiber === null) {781 // TODO: Move out of the loop. This only happens for the first run.782 resultingFirstChild = newFiber;783 } else {784 previousNewFiber.sibling = newFiber;785 }786 previousNewFiber = newFiber;787 }788 return resultingFirstChild;789 }790 // Add all children to a key map for quick lookups.791 const existingChildren = mapRemainingChildren(returnFiber, oldFiber);792 // Keep scanning and use the map to restore deleted items as moves.793 for (; newIdx < newChildren.length; newIdx++) {794 const newFiber = updateFromMap(795 existingChildren,796 returnFiber,797 newIdx,798 newChildren[newIdx],799 expirationTime,800 );801 if (newFiber !== null) {802 if (shouldTrackSideEffects) {803 if (newFiber.alternate !== null) {804 // The new fiber is a work in progress, but if there exists a805 // current, that means that we reused the fiber. We need to delete806 // it from the child list so that we don't add it to the deletion807 // list.808 existingChildren.delete(809 newFiber.key === null ? newIdx : newFiber.key,810 );811 }812 }813 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);814 if (previousNewFiber === null) {815 resultingFirstChild = newFiber;816 } else {817 previousNewFiber.sibling = newFiber;818 }819 previousNewFiber = newFiber;820 }821 }822 if (shouldTrackSideEffects) {823 // Any existing children that weren't consumed above were deleted. We need824 // to add them to the deletion list.825 existingChildren.forEach(child => deleteChild(returnFiber, child));826 }827 return resultingFirstChild;828 }829 function reconcileChildrenIterator(830 returnFiber: Fiber,831 currentFirstChild: Fiber | null,832 newChildrenIterable: Iterable<*>,833 expirationTime: ExpirationTime,834 ): Fiber | null {835 // This is the same implementation as reconcileChildrenArray(),836 // but using the iterator instead.837 const iteratorFn = getIteratorFn(newChildrenIterable);838 invariant(839 typeof iteratorFn === 'function',840 'An object is not an iterable. This error is likely caused by a bug in ' +841 'React. Please file an issue.',842 );843 if (__DEV__) {844 // We don't support rendering Generators because it's a mutation.845 // See https://github.com/facebook/react/issues/12995846 if (847 typeof Symbol === 'function' &&848 // $FlowFixMe Flow doesn't know about toStringTag849 newChildrenIterable[Symbol.toStringTag] === 'Generator'850 ) {851 warning(852 didWarnAboutGenerators,853 'Using Generators as children is unsupported and will likely yield ' +854 'unexpected results because enumerating a generator mutates it. ' +855 'You may convert it to an array with `Array.from()` or the ' +856 '`[...spread]` operator before rendering. Keep in mind ' +857 'you might need to polyfill these features for older browsers.',858 );859 didWarnAboutGenerators = true;860 }861 // Warn about using Maps as children862 if ((newChildrenIterable: any).entries === iteratorFn) {863 warning(864 didWarnAboutMaps,865 'Using Maps as children is unsupported and will likely yield ' +866 'unexpected results. Convert it to a sequence/iterable of keyed ' +867 'ReactElements instead.',868 );869 didWarnAboutMaps = true;870 }871 // First, validate keys.872 // We'll get a different iterator later for the main pass.873 const newChildren = iteratorFn.call(newChildrenIterable);874 if (newChildren) {875 let knownKeys = null;876 let step = newChildren.next();877 for (; !step.done; step = newChildren.next()) {878 const child = step.value;879 knownKeys = warnOnInvalidKey(child, knownKeys);880 }881 }882 }883 const newChildren = iteratorFn.call(newChildrenIterable);884 invariant(newChildren != null, 'An iterable object provided no iterator.');885 let resultingFirstChild: Fiber | null = null;886 let previousNewFiber: Fiber | null = null;887 let oldFiber = currentFirstChild;888 let lastPlacedIndex = 0;889 let newIdx = 0;890 let nextOldFiber = null;891 let step = newChildren.next();892 for (893 ;894 oldFiber !== null && !step.done;895 newIdx++, step = newChildren.next()896 ) {897 if (oldFiber.index > newIdx) {898 nextOldFiber = oldFiber;899 oldFiber = null;900 } else {901 nextOldFiber = oldFiber.sibling;902 }903 const newFiber = updateSlot(904 returnFiber,905 oldFiber,906 step.value,907 expirationTime,908 );909 if (newFiber === null) {910 // TODO: This breaks on empty slots like null children. That's911 // unfortunate because it triggers the slow path all the time. We need912 // a better way to communicate whether this was a miss or null,913 // boolean, undefined, etc.914 if (oldFiber === null) {915 oldFiber = nextOldFiber;916 }917 break;918 }919 if (shouldTrackSideEffects) {920 if (oldFiber && newFiber.alternate === null) {921 // We matched the slot, but we didn't reuse the existing fiber, so we922 // need to delete the existing child.923 deleteChild(returnFiber, oldFiber);924 }925 }926 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);927 if (previousNewFiber === null) {928 // TODO: Move out of the loop. This only happens for the first run.929 resultingFirstChild = newFiber;930 } else {931 // TODO: Defer siblings if we're not at the right index for this slot.932 // I.e. if we had null values before, then we want to defer this933 // for each null value. However, we also don't want to call updateSlot934 // with the previous one.935 previousNewFiber.sibling = newFiber;936 }937 previousNewFiber = newFiber;938 oldFiber = nextOldFiber;939 }940 if (step.done) {941 // We've reached the end of the new children. We can delete the rest.942 deleteRemainingChildren(returnFiber, oldFiber);943 return resultingFirstChild;944 }945 if (oldFiber === null) {946 // If we don't have any more existing children we can choose a fast path947 // since the rest will all be insertions.948 for (; !step.done; newIdx++, step = newChildren.next()) {949 const newFiber = createChild(returnFiber, step.value, expirationTime);950 if (newFiber === null) {951 continue;952 }953 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);954 if (previousNewFiber === null) {955 // TODO: Move out of the loop. This only happens for the first run.956 resultingFirstChild = newFiber;957 } else {958 previousNewFiber.sibling = newFiber;959 }960 previousNewFiber = newFiber;961 }962 return resultingFirstChild;963 }964 // Add all children to a key map for quick lookups.965 const existingChildren = mapRemainingChildren(returnFiber, oldFiber);966 // Keep scanning and use the map to restore deleted items as moves.967 for (; !step.done; newIdx++, step = newChildren.next()) {968 const newFiber = updateFromMap(969 existingChildren,970 returnFiber,971 newIdx,972 step.value,973 expirationTime,974 );975 if (newFiber !== null) {976 if (shouldTrackSideEffects) {977 if (newFiber.alternate !== null) {978 // The new fiber is a work in progress, but if there exists a979 // current, that means that we reused the fiber. We need to delete980 // it from the child list so that we don't add it to the deletion981 // list.982 existingChildren.delete(983 newFiber.key === null ? newIdx : newFiber.key,984 );985 }986 }987 lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx);988 if (previousNewFiber === null) {989 resultingFirstChild = newFiber;990 } else {991 previousNewFiber.sibling = newFiber;992 }993 previousNewFiber = newFiber;994 }995 }996 if (shouldTrackSideEffects) {997 // Any existing children that weren't consumed above were deleted. We need998 // to add them to the deletion list.999 existingChildren.forEach(child => deleteChild(returnFiber, child));1000 }1001 return resultingFirstChild;1002 }1003 function reconcileSingleTextNode(1004 returnFiber: Fiber,1005 currentFirstChild: Fiber | null,1006 textContent: string,1007 expirationTime: ExpirationTime,1008 ): Fiber {1009 // There's no need to check for keys on text nodes since we don't have a1010 // way to define them.1011 if (currentFirstChild !== null && currentFirstChild.tag === HostText) {1012 // We already have an existing node so let's just update it and delete1013 // the rest.1014 deleteRemainingChildren(returnFiber, currentFirstChild.sibling);1015 const existing = useFiber(currentFirstChild, textContent, expirationTime);1016 existing.return = returnFiber;1017 return existing;1018 }1019 // The existing first child is not a text node so we need to create one1020 // and delete the existing ones.1021 deleteRemainingChildren(returnFiber, currentFirstChild);1022 const created = createFiberFromText(1023 textContent,1024 returnFiber.mode,1025 expirationTime,1026 );1027 created.return = returnFiber;1028 return created;1029 }1030 function reconcileSingleElement(1031 returnFiber: Fiber,1032 currentFirstChild: Fiber | null,1033 element: ReactElement,1034 expirationTime: ExpirationTime,1035 ): Fiber {1036 const key = element.key;1037 let child = currentFirstChild;1038 while (child !== null) {1039 // TODO: If key === null and child.key === null, then this only applies to1040 // the first item in the list.1041 if (child.key === key) {1042 if (1043 child.tag === Fragment1044 ? element.type === REACT_FRAGMENT_TYPE1045 : child.elementType === element.type1046 ) {1047 deleteRemainingChildren(returnFiber, child.sibling);1048 const existing = useFiber(1049 child,1050 element.type === REACT_FRAGMENT_TYPE1051 ? element.props.children1052 : element.props,1053 expirationTime,1054 );1055 existing.ref = coerceRef(returnFiber, child, element);1056 existing.return = returnFiber;1057 if (__DEV__) {1058 existing._debugSource = element._source;1059 existing._debugOwner = element._owner;1060 }1061 return existing;1062 } else {1063 deleteRemainingChildren(returnFiber, child);1064 break;1065 }1066 } else {1067 deleteChild(returnFiber, child);1068 }1069 child = child.sibling;1070 }1071 if (element.type === REACT_FRAGMENT_TYPE) {1072 const created = createFiberFromFragment(1073 element.props.children,1074 returnFiber.mode,1075 expirationTime,1076 element.key,1077 );1078 created.return = returnFiber;1079 return created;1080 } else {1081 const created = createFiberFromElement(1082 element,1083 returnFiber.mode,1084 expirationTime,1085 );1086 created.ref = coerceRef(returnFiber, currentFirstChild, element);1087 created.return = returnFiber;1088 return created;1089 }1090 }1091 function reconcileSinglePortal(1092 returnFiber: Fiber,1093 currentFirstChild: Fiber | null,1094 portal: ReactPortal,1095 expirationTime: ExpirationTime,1096 ): Fiber {1097 const key = portal.key;1098 let child = currentFirstChild;1099 while (child !== null) {1100 // TODO: If key === null and child.key === null, then this only applies to1101 // the first item in the list.1102 if (child.key === key) {1103 if (1104 child.tag === HostPortal &&1105 child.stateNode.containerInfo === portal.containerInfo &&1106 child.stateNode.implementation === portal.implementation1107 ) {1108 deleteRemainingChildren(returnFiber, child.sibling);1109 const existing = useFiber(1110 child,1111 portal.children || [],1112 expirationTime,1113 );1114 existing.return = returnFiber;1115 return existing;1116 } else {1117 deleteRemainingChildren(returnFiber, child);1118 break;1119 }1120 } else {1121 deleteChild(returnFiber, child);1122 }1123 child = child.sibling;1124 }1125 const created = createFiberFromPortal(1126 portal,1127 returnFiber.mode,1128 expirationTime,1129 );1130 created.return = returnFiber;1131 return created;1132 }1133 // This API will tag the children with the side-effect of the reconciliation1134 // itself. They will be added to the side-effect list as we pass through the1135 // children and the parent.1136 function reconcileChildFibers(1137 returnFiber: Fiber,1138 currentFirstChild: Fiber | null,1139 newChild: any,1140 expirationTime: ExpirationTime,1141 ): Fiber | null {1142 // This function is not recursive.1143 // If the top level item is an array, we treat it as a set of children,1144 // not as a fragment. Nested arrays on the other hand will be treated as1145 // fragment nodes. Recursion happens at the normal flow.1146 // Handle top level unkeyed fragments as if they were arrays.1147 // This leads to an ambiguity between <>{[...]}</> and <>...</>.1148 // We treat the ambiguous cases above the same.1149 const isUnkeyedTopLevelFragment =1150 typeof newChild === 'object' &&1151 newChild !== null &&1152 newChild.type === REACT_FRAGMENT_TYPE &&1153 newChild.key === null;1154 if (isUnkeyedTopLevelFragment) {1155 newChild = newChild.props.children;1156 }1157 // Handle object types1158 const isObject = typeof newChild === 'object' && newChild !== null;1159 if (isObject) {1160 switch (newChild.$$typeof) {1161 case REACT_ELEMENT_TYPE:1162 return placeSingleChild(1163 reconcileSingleElement(1164 returnFiber,1165 currentFirstChild,1166 newChild,1167 expirationTime,1168 ),1169 );1170 case REACT_PORTAL_TYPE:1171 return placeSingleChild(1172 reconcileSinglePortal(1173 returnFiber,1174 currentFirstChild,1175 newChild,1176 expirationTime,1177 ),1178 );1179 }1180 }1181 if (typeof newChild === 'string' || typeof newChild === 'number') {1182 return placeSingleChild(1183 reconcileSingleTextNode(1184 returnFiber,1185 currentFirstChild,1186 '' + newChild,1187 expirationTime,1188 ),1189 );1190 }1191 if (isArray(newChild)) {1192 return reconcileChildrenArray(1193 returnFiber,1194 currentFirstChild,1195 newChild,1196 expirationTime,1197 );1198 }1199 if (getIteratorFn(newChild)) {1200 return reconcileChildrenIterator(1201 returnFiber,1202 currentFirstChild,1203 newChild,1204 expirationTime,1205 );1206 }1207 if (isObject) {1208 throwOnInvalidObjectType(returnFiber, newChild);1209 }1210 if (__DEV__) {1211 if (typeof newChild === 'function') {1212 warnOnFunctionType();1213 }1214 }...

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reconcileChildren.js

Source:reconcileChildren.js Github

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...66 return reconcileChildrenArray(returnFiber, currentFirstChild, newChild, expirationTime);67 }6869 if (getIteratorFn(newChild)) {70 return reconcileChildrenIterator(returnFiber, currentFirstChild, newChild, expirationTime);71 }7273 if (isObject) {74 throwOnInvalidObjectType(returnFiber, newChild);75 }7677 {78 if (typeof newChild === 'function') {79 warnOnFunctionType();80 }81 }82 if (typeof newChild === 'undefined') {83 // If the new child is undefined, and the return fiber is a composite84 // component, throw an error. If Fiber return types are disabled,85 // we already threw above.86 switch (returnFiber.tag) {87 case ClassComponent:88 {89 {90 var instance = returnFiber.stateNode;91 if (instance.render._isMockFunction) {92 // We allow auto-mocks to proceed as if they're returning null.93 break;94 }95 }96 }97 // Intentionally fall through to the next case, which handles both98 // functions and classes99 // eslint-disable-next-lined no-fallthrough100 case FunctionalComponent:101 {102 var Component = returnFiber.type;103 invariant(false, '%s(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.', Component.displayName || Component.name || 'Component');104 }105 }106 }107108 // Remaining cases are all treated as empty.109 return deleteRemainingChildren(returnFiber, currentFirstChild);110}111112// 调和单个 react element113function reconcileSingleElement(returnFiber, currentFirstChild, element, expirationTime) {114 var key = element.key;115 var child = currentFirstChild;116117 // 更新118 while (child !== null) {119 // TODO: If key === null and child.key === null, then this only applies to120 // the first item in the list.121 if (child.key === key) {122 if (child.tag === Fragment ? element.type === REACT_FRAGMENT_TYPE : child.type === element.type) {123124 // key 相同 type 相同，清除workInProgress除当前fiber子节点外的所有子节点125 deleteRemainingChildren(returnFiber, child.sibling);126127 // 创建一个当前child的workInProgress128 var existing = useFiber(child, element.type === REACT_FRAGMENT_TYPE ? element.props.children : element.props, expirationTime);129 existing.ref = coerceRef(returnFiber, child, element);130 existing['return'] = returnFiber;131 {132 existing._debugSource = element._source;133 existing._debugOwner = element._owner;134 }135 return existing;136 } else {137 // key相同，type不同，清除所有子节点138 deleteRemainingChildren(returnFiber, child);139 break;140 }141 } else {142 // 如果key不相同，直接从当前的workInProgress清除当前fiber子节点，继续处理下一个子节点143 deleteChild(returnFiber, child);144 }145 child = child.sibling;146 }147148 if (element.type === REACT_FRAGMENT_TYPE) {149 // fragment150 var created = createFiberFromFragment(element.props.children, returnFiber.mode, expirationTime, element.key);151 created['return'] = returnFiber;152 return created;153 } else {154155 // 创建子级 fiber ../Fiber.js156 // 根据子组件类型创建fiber157 var _created4 = createFiberFromElement(element, returnFiber.mode, expirationTime);158 // ref相关暂时忽略159 _created4.ref = coerceRef(returnFiber, currentFirstChild, element);160 // 关联父级 fiber，模拟函数栈调用，子级函数执行完成，调用栈返回父级161 _created4['return'] = returnFiber;162 return _created4;163 }164}165166167168// 调和多个子级fiber的更新,看的头昏脑涨才看明白的算法169// 首次插入的时候，直接生成子节点，添加fiber.index 不解释170// 更新的时候171// 从第一个子节点开始处理，跟新的childList列表中的第一个元素比较，如果key匹配，更新，开始处理第二个节点，依次类推，一旦不匹配，跳出循环，从当前节点开始向后，全部添加到Map当中，遍历map和剩余的childList，存在既更新，不存在既新建，childList遍历完成之后，如果map当中还存在子节点，添加到删除列表172function reconcileChildrenArray(returnFiber, currentFirstChild, newChildren, expirationTime) {173 // This algorithm can't optimize by searching from boths ends since we174 // don't have backpointers on fibers. I'm trying to see how far we can get175 // with that model. If it ends up not being worth the tradeoffs, we can176 // add it later.177178 // Even with a two ended optimization, we'd want to optimize for the case179 // where there are few changes and brute force the comparison instead of180 // going for the Map. It'd like to explore hitting that path first in181 // forward-only mode and only go for the Map once we notice that we need182 // lots of look ahead. This doesn't handle reversal as well as two ended183 // search but that's unusual. Besides, for the two ended optimization to184 // work on Iterables, we'd need to copy the whole set.185186 // In this first iteration, we'll just live with hitting the bad case187 // (adding everything to a Map) in for every insert/move.188189 // If you change this code, also update reconcileChildrenIterator() which190 // uses the same algorithm.191192 {193 // First, validate keys.194 var knownKeys = null;195 for (var i = 0; i < newChildren.length; i++) {196 var child = newChildren[i];197 knownKeys = warnOnInvalidKey(child, knownKeys);198 }199 }200 201 var resultingFirstChild = null;202 var previousNewFiber = null;203 ...

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ReactChildFiber.new.js

Source:ReactChildFiber.new.js Github

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...483 }484 485 return resultingFirstChild486 }487 function reconcileChildrenIterator(488 returnFiber,489 currentFirstChild,490 newChildrenIterable,491 lanes,492 ) {493 const iteratorFn = getIteratorFn(newChildrenIterable)494 const newChildren = iteratorFn.call(newChildrenIterable)495 // ...496 }497 function reconcileSingleTextNode(498 returnFiber,499 currentFirstChild,500 textContent,501 lanes,502 ) {503 if (currentFirstChild !== null && currentFirstChild.tag === HostText) {504 deleteRemainingChildren(returnFiber, currentFirstChild.sibling)505 const existing = useFiber(currentFirstChild, textContent)506 existing.return = returnFiber507 return existing508 }509 deleteRemainingChildren(returnFiber, currentFirstChild)510 const created = createFiberFromText(textContent, returnFiber.mode, lanes)511 created.return = returnFiber512 return created513 }514 function reconcileSingleElement(515 returnFiber,516 currentFirstChild,517 element,518 lanes,519 ) {520 const key = element.key521 let child = currentFirstChild522 while (child !== null) {523 const elementType = element.type;524 if (child.key === key) {525 const elementType = element.type526 if (elementType === REACT_FRAGMENT_TYPE) {527 if (child.tag === Fragment) {528 deleteRemainingChildren(returnFiber, child.sibling)529 const existing = useFiber(child, element.props.children)530 existing.return = returnFiber531 return existing532 }533 } else {534 if (535 child.elementType === elementType ||536 (537 enableLazyElements &&538 elementType !== null &&539 element.$$typeof === REACT_LAZY_TYPE &&540 resolveLazy(elementType).type === child.type541 )542 ) {543 deleteRemainingChildren(returnFiber, child.sibling)544 const existing = useFiber(child, element.props)545 existing.ref = coerceRef(returnFiber, child, element)546 existing.return = returnFiber547 return existing548 }549 }550 deleteRemainingChildren(returnFiber, child)551 break552 } else {553 deleteChild(returnFiber, child) 554 }555 }556 if (element.type === REACT_FRAGMENT_TYPE) {557 const created = createFiberFromFragment(558 element.props.children,559 returnFiber.mode,560 lanes,561 element.key,562 )563 created.return = returnFiber564 return created565 } else {566 const created = createFiberFromElement(567 element,568 returnFiber.mode,569 lanes,570 )571 created.ref = coerceRef(returnFiber, currentFirstChild, element)572 created.return = returnFiber573 return created574 }575 }576 function reconcileSinglePortal(577 returnFiber,578 currentFirstChild,579 portal,580 lanes,581 ) {582 const key = portal.key583 let child = currentFirstChild584 while (child !== null) {585 if (child.key === key) {586 if (587 child.tag === HostPortal &&588 child.statNode.containerInfo === portal.containerInfo &&589 child.stateNode.implementation === portal.implementation590 ) {591 deleteRemainingChildren(returnFiber, child.sibling)592 const existing = useFiber(child, portal.children || [])593 existing.return = returnFiber594 return existing595 } else {596 deleteRemainingChildren(returnFiber, child)597 break598 }599 }600 child = child.sibling601 }602 const created = createFiberFromPortal(603 portal,604 returnFiber.mode,605 lanes,606 )607 created.return = returnFiber608 return created609 }610 function reconcileChildFibers(611 returnFiber,612 currentFirstChild,613 newChild,614 lanes,615 ) {616 const isUnkeyedTopLevelFragment =617 typeof newChild === 'object' && 618 newChild !== null &&619 newChild.type === REACT_FRAGMENT_TYPE &&620 newChild.key === null621 if (isUnkeyedTopLevelFragment) {622 newChild = newChild.props.children623 }624 const isObject = typeof newChild === 'object' && newChild !== null625 if (isObject) {626 switch (newChild.$$typeof) {627 case REACT_ELEMENT_TYPE:628 return placeSingleChild(629 reconcileSingleElement(630 returnFiber,631 currentFirstChild,632 newChild,633 lanes,634 )635 )636 case REACT_PORTAL_TYPE:637 return placeSingleChild(638 reconcileSinglePortal(639 returnFiber,640 currentFirstChild,641 newChild,642 lanes,643 )644 )645 case REACT_LAZY_TYPE:646 if (enableLazyElements) {647 const payload = newChild._payload648 const init = newChild._init649 return reconcileChildFibers(650 returnFiber,651 currentFirstChild,652 init(payload),653 lanes,654 )655 }656 }657 }658 if (typeof newChild === 'string' || typeof newChild === 'number') {659 return placeSingleChild(660 reconcileSingleTextNode(661 returnFiber,662 currentFirstChild,663 '' + newChild,664 lanes,665 )666 )667 }668 if (isArray(newChild)) {669 return reconcileChildrenArray(670 returnFiber,671 currentFirstChild,672 newChild,673 lanes,674 )675 }676 if (getIteratorFn(newChild)) {677 return reconcileChildrenIterator(678 returnFiber,679 currentFirstChild,680 newChild,681 lanes,682 )683 }684 return deleteRemainingChildren(returnFiber, currentFirstChild);685 }686 return reconcileChildFibers;687}688export const reconcileChildFibers = ChildReconciler(true)689export const mountChildFibers = ChildReconciler(false)690export function cloneChildFibers(current, workInProgress) {691 if (workInProgress.child === null) {...

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ReactChildFiber.js

Source:ReactChildFiber.js Github

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...659 lanes660 );661 }662 if (getIteratorFn(newChild)) {663 return reconcileChildrenIterator(664 returnFiber,665 currentFirstChild,666 newChild,667 lanes668 );669 }670 return deleteRemainingChildren(returnFiber, currentFirstChild);671 };672 return reconcileChildFibers;673};674const reconcileChildFibers = ChildReconciler(true);675const mountChildFibers = ChildReconciler(false);...

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beginWork.js

Source:beginWork.js Github

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...139 return reconcileChildrenArray(returnFiber, currentFirstChild, newChild, lanes);140 }141 // 可迭代对象142 if (getIteratorFn(newChild)) {143 return reconcileChildrenIterator(returnFiber, currentFirstChild, newChild, lanes);144 }145 }146 if (typeof newChild === 'string' || typeof newChild === 'number') {147 // 文本节点148 return placeSingleChild(reconcileSingleTextNode(returnFiber, currentFirstChild, '' + newChild, lanes));149 }150 // while(current.sibling) 删除生效的兄弟节点 - 删除：标记flags(原effectTag)，将fiber推入returnFiber的 deletions中151 return deleteRemainingChildren(returnFiber, currentFirstChild);152 }153 return reconcileChildFibers1;...

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recileChildren.js

Source:recileChildren.js Github

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...75 expirationTime,76 );77 }78 if (getIteratorFn(newChild)) {79 return reconcileChildrenIterator(80 returnFiber,81 currentFirstChild,82 newChild,83 expirationTime,84 );85 }86 if (isObject) {87 throwOnInvalidObjectType(returnFiber, newChild);88 }89 return deleteRemainingChildren(returnFiber, currentFirstChild);...

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templet.js

Source:templet.js Github

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...13//14// In this first iteration, we'll just live with hitting the bad case15// (adding everything to a Map) in for every insert/move.16//17// If you change this code, also update reconcileChildrenIterator() which...

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 const handle = await page.$('text=Get Started');7 const result = await page.evaluate((handle) => {8 const { reconcileChildrenIterator } = require('@playwright/test/lib/utils');9 const children = reconcileChildrenIterator(handle, null, null);10 return [...children];11 }, handle);12 console.log(result);13 await browser.close();14})();15[ { type: 'text', value: 'Get Started' },16 { type: 'text', value: ' ' },17 { type: 'text', value: 'Guide' },18 { type: 'text', value: '19' },20 { type: 'text', value: ' ' },21 { type: 'text', value: 'API' },22 { type: 'text', value: '23' },24 { type: 'text', value: ' ' },25 { type: 'text', value: 'Examples' },26 { type: 'text', value: '27' },28 { type: 'text', value: ' ' },29 { type: 'text', value: 'FAQ' },30 { type: 'text', value: '31' },32 { type: 'text', value: ' ' },33 { type: 'text', value: 'Blog' },34 { type: 'text', value: '35' } ]

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Using AI Code Generation

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1const { chromium } = require('playwright');2const path = require('path');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const element = await page.$('input[name="q"]');8 await element.type('hello');9 await element.press('Enter');10 await page.waitForNavigation();11 const element2 = await page.$('input[name="q"]');12 await element2.type('hello');13 await element2.press('Enter');14 await page.waitForNavigation();15 const element3 = await page.$('input[name="q"]');16 await element3.type('hello');17 await element3.press('Enter');18 await page.waitForNavigation();19 await browser.close();20})();21const { chromium } = require('playwright');22const path = require('path');23(async () => {24 const browser = await chromium.launch();25 const context = await browser.newContext();26 const page = await context.newPage();27 const element = await page.$('input[name="q"]');28 await element.type('hello');29 await element.press('Enter');30 await page.waitForNavigation();31 const element2 = await page.$('input[name="q"]');32 await element2.type('hello');33 await element2.press('Enter');34 await page.waitForNavigation();35 const element3 = await page.$('input[name="q"]');36 await element3.type('hello');37 await element3.press('Enter');38 await page.waitForNavigation();39 await browser.close();40})();

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Using AI Code Generation

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1const { chromium } = require('playwright');2const { Reconciler } = require('playwright/lib/server/supplements/recorder/recorderSupplement');3(async () => {4 const browser = await chromium.launch();5 const page = await browser.newPage();6 const recorder = await page.evaluateHandle(() => window.__playwrightRecorder);7 const reconciler = new Reconciler(recorder);8 const iterator = reconciler.reconcileChildrenIterator();9 for (const { action, target } of iterator) {10 console.log(action, target);11 }12 await browser.close();13})();

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const page = await browser.newPage();5 const iterator = await page.reconcileChildrenIterator();6 console.log(iterator.next());7 console.log(iter

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Using AI Code Generation

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1const { Reconciler } = require('playwright/lib/server/dom/reconciler');2const { ElementHandle } = require('playwright/lib/server/dom/elementHandle');3const { JSHandle } = require('playwright/lib/server/dom/JSHandle');4const { createJSHandle } = require('playwright/lib/server/dom/elementHandleDispatcher');5const { createHandle } = require('playwright/lib/server/common/JSHandle');6const { parse } = require('playwright/lib/server/dom/parse');7const { serialize } = require('playwright/lib/server/dom/serializers/serializer');8const { toImpl } = require('playwright/lib/server/common/utils');9const { createTestServer } = require('playwright/lib/utils/testserver/');10const { Page } = require('playwright/lib/server/page');11const { Frame } = require('playwright/lib/server/frame');12const { Connection } = require('playwright/lib/server/connection');13const { createTestServer } = require('playwright/lib/utils/testserver/');14const { Page } = require('playwright/lib/server/page');15const { Frame } = require('playwright/lib/server/frame');16const { Connection } = require('playwright/lib/server/connection');17const { createTestServer } = require('playwright/lib/utils/testserver/');18const { Page } = require('playwright/lib/server/page');19const { Frame } = require('playwright/lib/server/frame');20const { Connection } = require('playwright/lib/server/connection');21const { createTestServer } = require('playwright/lib/utils/testserver/');22const { Page } = require('playwright/lib/server/page');23const { Frame } = require('playwright/lib/server/frame');24const { Connection } = require('playwright/lib/server/connection');25const { createTestServer } = require('playwright/lib/utils/testserver/');26const { Page } = require('playwright/lib/server/page');27const { Frame } = require('playwright/lib/server/frame');28const { Connection } = require('playwright/lib/server/connection');29const { createTestServer } = require('playwright/lib/utils/testserver/');30const { Page } = require('playwright/lib/server/page');31const { Frame } = require('playwright/lib/server/frame');32const { Connection } = require('playwright/lib/server/connection');33const { createTestServer } = require('playwright/lib/utils/testserver/');34const { Page } = require('playwright

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Using AI Code Generation

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1const {reconcileChildrenIterator} = require('playwright-core/lib/server/dom.js');2const {createTestServer} = require('playwright-core/lib/utils/testserver/');3const {getTestState} = require('playwright-core/lib/utils/testrunner/');4const {getTestType} = require('playwright-core/lib/utils/testrunner/');5const {getTestName} = require('playwright-core/lib/utils/testrunner/');6const {registerFixture} = require('playwright-core/lib/utils/testrunner/');7const {registerWorkerFixture} = require('playwright-core/lib/utils/testrunner/');8const {registerParameter} = require('playwright-core/lib/utils/testrunner/');9const {registerWorkerParameter} = require('playwright-core/lib/utils/testrunner/');10const {registerWorkerFixtureCallback} = require('playwright-core/lib/utils/testrunner/');11const {registerFixtureCallback} = require('playwright-core/lib/utils/testrunner/');12const {registerWorkerParameterCallback} = require('playwright-core/lib/utils/testrunner/');13const {registerParameterCallback} = require('playwright-core/lib/utils/testrunner/');14const {setTestDescription} = require('playwright-core/lib/utils/testrunner/');15const {setTestModifier} = require('playwright-core/lib/utils/testrunner/');16const {setTestTimeout} = require('playwright-core/lib/utils/testrunner/');17const {setTestSkip} = require('playwright-core/lib/utils/testrunner/');18const {setTestFixtures} = require('playwright-core/lib/utils/testrunner/');19const {setTestParameters} = require('playwright-core/lib/utils/testrunner/');20const {setTestType} = require('playwright-core/lib/utils/testrunner/');21const {setTestName} = require('playwright-core/lib/utils/testrunner/');22const {setTestLocation} = require('playwright-core/lib/utils/testrunner/');23const {setTestFixture} = require('playwright-core/lib/utils/testrunner/');24const {setTestWorkerIndex} = require('playwright-core/lib/utils/testrunner/');25const {setTestWorkerCount} = require('playwright-core/lib/utils/testrunner/');26const {setTestRetry} = require('playwright-core/lib/utils/testrunner/');27const {setTestExpectedStatus} = require('playwright-core/lib/utils/testrunner/');28const {setTestOutputDir} = require('playwright-core/lib/utils/testrunner/');29const {setTestOutputDirRelative} = require('playwright-core/lib/utils

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Using AI Code Generation

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1const { chromium } = require('playwright');2const path = require('path');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 await page.fill('#new-todo', 'Hello');8 await page.keyboard.press('Enter');9 await page.fill('#new-todo', 'World');10 await page.keyboard.press('Enter');11 const children = await page.$eval('#todo-list', (el) => {12 const internal = require(path.resolve(process.cwd(), 'node_modules/playwright/lib/server/dom.js')).internal;13 const children = internal.reconcileChildrenIterator(el, [], []);14 return Array.from(children);15 });16 console.log(children);17 await browser.close();18})();

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Using AI Code Generation

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1const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');2const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');3const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');4const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');5const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');6const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');7const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');8const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');9const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');10const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');11const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');12const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');13const { reconcileChildrenIterator } = require('playwright/lib/server/dom.js');

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Using AI Code Generation

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1const { Playwright } = require('playwright');2const { reconcileChildrenIterator } = Playwright._internal.reconciler;3const { parse } = require('playwright-core/lib/server/dom').parse;4const a = parse(`5`);6const b = parse(`7`);8const result = reconcileChildrenIterator(a, b);9console.log(result);10 { type: 'insert', index: 1, node: <div>2</div> },11 { type: 'move', from: 2, to: 1 }12 { type: 'insert', index: 1, node: <div>2</div> },13 { type: 'move', from: 2, to: 1 },14 { type: 'move', from: 1, to: 0 }15 { type: 'insert', index: 1, node: <div>2</div> },16 { type: 'move', from: 2, to: 1 },17 { type: 'move', from: 1, to: 0 }

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Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

  1. What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
  2. How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
  3. Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
  4. What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
  5. Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
  6. Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
  7. Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
  8. Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
  9. Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
  10. Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
  11. Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
  12. Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.

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