@lwc/synthetic-shadow - npm Package Compare versions

Comparing version 0.37.3-alpha9 to 0.37.4-alpha1

dist/umd/es2017/shadow.min.js

@@ -1,1 +0,1 @@
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e=D.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),r(Document.prototype,"getElementsByTagNameNS",{value:function(){var e=I.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),r(a(HTMLDocument.prototype,"getElementsByName")?HTMLDocument.prototype:Document.prototype,"getElementsByName",{value:function(){var e=A.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),Dn=HTMLBodyElement.prototype,r(Dn,"querySelector",{value:function(){var e=ne.apply(this,p.call(arguments)),t=Sn(this),n=s.call(e,function(e){return Sn(e)===t});return E(n)?null:n},writable:!0,enumerable:!0,configurable:!0}),r(Dn,"querySelectorAll",{value:function(){var e=ne.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),r(Dn,"getElementsByClassName",{value:function(){var e=he.apply(this,p.call(arguments)),t=Sn(this);return ct(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),r(Dn,"getElementsByTagName",{value:function(){var e=oe.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),r(Dn,"getElementsByTagNameNS",{value:function(){var e=le.apply(this,p.call(arguments)),t=Sn(this);return at(f.call(e,function(e){return Sn(e)===t}))},writable:!0,enumerable:!0,configurable:!0}),void 0===window.ShadowRoot&&(window.ShadowRoot=Mt);var An=Object.getOwnPropertyDescriptor(Event.prototype,"composed");var jn,xn=Object.getOwnPropertyDescriptor(HTMLElement.prototype,"click");function Hn(e){Object.defineProperty(e,"composed",{configurable:!0,enumerable:!0,get:function(){return!0}})}(function(){if(!An)return!1;var e=new Event("click"),t=document.createElement("button");return t.addEventListener("click",function(t){return e=t}),t.click(),!An.get.call(e)})()&&(HTMLElement.prototype.click=function(){ie.call(this,"click",Hn);try{xn.value.call(this)}finally{ue.call(this,"click",Hn)}}),void 0===Object.getOwnPropertyDescriptor(Event.prototype,"composed")&&(jn=n(t(null),{blur:1,focus:1,focusin:1,focusout:1,click:1,dblclick:1,mousedown:1,mouseenter:1,mouseleave:1,mousemove:1,mouseout:1,mouseover:1,mouseup:1,wheel:1,beforeinput:1,input:1,keydown:1,keyup:1,compositionstart:1,compositionupdate:1,compositionend:1,touchstart:1,touchend:1,touchmove:1,touchcancel:1,pointerover:1,pointerenter:1,pointerdown:1,pointermove:1,pointerup:1,pointercancel:1,pointerout:1,pointerleave:1,gotpointercapture:1,lostpointercapture:1,dragstart:1,drag:1,dragenter:1,dragleave:1,dragover:1,drop:1,dragend:1,DOMActivate:1,DOMFocusIn:1,DOMFocusOut:1,keypress:1}),Object.defineProperties(Event.prototype,{composed:{get:function(){var e=this.type;return 1===jn[e]},configurable:!0,enumerable:!0}}));var $n,Bn=window.CustomEvent;function Fn(e,t){var n=new Bn(e,t);return Object.defineProperties(n,{composed:{get:function(){return!(!t||!t.composed)},configurable:!0,enumerable:!0}}),n}window.CustomEvent!==Fn&&(window.CustomEvent=Fn,window.CustomEvent.prototype=Bn.prototype),$n=Object.getOwnPropertyDescriptor(Event.prototype,"composed").get,Object.defineProperties(FocusEvent.prototype,{composed:{get:function(){var e=this.isTrusted,t=$n.call(this);return!(!e||!1!==t)||t},enumerable:!0,configurable:!0}});var kn=window.MutationObserver,Wn=kn.prototype,Un=Wn.disconnect,qn=Wn.observe,Kn=Wn.takeRecords,Gn="$$lwcObserverCallbackWrapper$$",Vn="$$lwcNodeObservers$$";function Xn(e){var n=e.addedNodes,r=e.removedNodes,o=e.target,l=e.type,a=t(MutationRecord.prototype);return i(a,{addedNodes:{get:function(){return n},enumerable:!0,configurable:!0},removedNodes:{get:function(){return r},enumerable:!0,configurable:!0},type:{get:function(){return l},enumerable:!0,configurable:!0},target:{get:function(){return o.shadowRoot},enumerable:!0,configurable:!0}}),a}function Yn(e,t){for(var n=t;!w(n);){var r=n[Vn];if(!E(r)&&(r[0]===e||-1!==b.call(r,e)))return!0;n=n.parentNode}return!1}function zn(e,t){return m.call(e,function(e,n){var r=n.target,o=n.addedNodes,l=n.removedNodes;if("childList"!==n.type||E(Ln(r)))Yn(t,r)&&h.call(e,n);else if(o.length>0){var a=o[0];Yn(t,a)&&(!r[Vn]||r[Vn][0]!==t&&-1===b.call(r[Vn],t)?h.call(e,Xn(n)):h.call(e,n))}else{var i=r.shadowRoot;a=l[0];_n(r)===_n(a)&&Yn(t,r)?h.call(e,n):i&&i[Vn]&&(i[Vn][0]===t||-1!==b.call(i[Vn],t))&&h.call(e,Xn(n))}return e},[])}function Jn(e){var t=function(e){var t=e[Gn];return E(t)&&(t=e[Gn]=function(t,n){var r=zn(t,n);0!==r.length&&e.call(n,r,n)}),t}(e);return new kn(t)}function Qn(){Un.call(this)}function Zn(e,t){return E(e[Vn])&&r(e,Vn,{value:[]}),h.call(e[Vn],this),e instanceof Mt&&(e=e.host),qn.call(this,e,t)}function er(){return zn(Kn.call(this),this)}window.MutationObserver=Jn,window.MutationObserver.prototype=kn.prototype,window.MutationObserver.prototype.disconnect=Qn,window.MutationObserver.prototype.observe=Zn,window.MutationObserver.prototype.takeRecords=er;var tr,nr=window.MutationObserver,rr=nr.prototype.observe,or={childList:!0,subtree:!0};function lr(e,t,n){if(Sn(e)!==t&&(function(e,t){e[On]=t}(e,t),e instanceof Element)){Pn(e,n);for(var r=In(e),o=0,l=r.length;o<l;o+=1){lr(r[o],t,n)}}}function ar(){return new nr(function(e){g.call(e,function(e){var t=e.target,n=e.addedNodes,r=Sn(t),o=function(e){return e[Mn]}(t);if(!E(r))for(var l=0,a=n.length;l<a;l+=1){lr(n[l],r,o)}})})}e.PatchedElement=fn,e.PatchedIframeElement=function(e){return function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return Ct(t,e),Object.defineProperty(t.prototype,"contentWindow",{get:function(){var e,t=me.call(this);return t?(e=t,{postMessage:function(){return e.postMessage.apply(e,arguments)},blur:function(){return e.blur.apply(e,arguments)},close:function(){return e.close.apply(e,arguments)},focus:function(){return e.focus.apply(e,arguments)},get closed(){return e.closed},get frames(){return e.frames},get length(){return e.length},get location(){return e.location},set location(t){e.location=t},get opener(){return e.opener},get parent(){return e.parent},get self(){return e.self},get top(){return e.top},get window(){return e.window}}):t},enumerable:!0,configurable:!0}),t}(fn(e))},e.PatchedNode=Rn,e.PatchedSlotElement=function(e){var t=fn(e),n=e.addEventListener;return function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return Ct(t,e),t.prototype.addEventListener=function(e,t,r){"slotchange"!==e||tt(this,pn)||(et(this,pn,!0),tn||(tn=new It(function(e){var t=[];g.call(e,function(e){var n=e.target;-1===b.call(t,n)&&(h.call(t,n),ve.call(n,new CustomEvent("slotchange")))})})),At.call(tn,this,sn)),n.call(this,e,t,r)},t.prototype.assignedElements=function(e){var t=!E(e)&&N(e.flatten)?bn(this):dn(this);return f.call(t,function(e){return e instanceof Element})},t.prototype.assignedNodes=function(e){return!E(e)&&N(e.flatten)?bn(this):dn(this)},Object.defineProperty(t.prototype,"name",{get:function(){var e=ee.call(this,"name");return w(e)?"":e},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"childNodes",{get:function(){var e=vn(this);return at(w(e)?[]:En(e,Nn(this)))},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"children",{get:function(){var e=vn(this),t=w(e)?[]:En(e,Nn(this));return ct(f.call(t,function(e){return e instanceof Element}))},enumerable:!0,configurable:!0}),t}(t)},e.markElementAsPortal=function(e){E(tr)&&(tr=ar()),rr.call(tr,e,or)},e.patchEvent=ke,e.setCSSToken=Pn,Object.defineProperty(e,"__esModule",{value:!0})});

lib/env/__mocks__/element.d.ts

 /// <reference types="jest" />
 declare const getBoundingClientRect: jest.Mock<{}>;
-export { addEventListener, removeEventListener, hasAttribute, getAttribute, getAttributeNS, setAttribute, setAttributeNS, removeAttribute, removeAttributeNS, querySelector, querySelectorAll, getElementsByTagName, getElementsByClassName, getElementsByTagNameNS, tagNameGetter, tabIndexGetter, innerHTMLSetter, matches, } from './../element';
+export * from './../element';
 export { getBoundingClientRect };

lib/env/__mocks__/element.js

 "use strict";
+function __export(m) {
+    for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
+}
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -16,21 +19,3 @@ /*
 exports.getBoundingClientRect = getBoundingClientRect;
-var element_1 = require("./../element"); // Pass through all the functions from element, we probably don't want those mocked
-exports.addEventListener = element_1.addEventListener;
-exports.removeEventListener = element_1.removeEventListener;
-exports.hasAttribute = element_1.hasAttribute;
-exports.getAttribute = element_1.getAttribute;
-exports.getAttributeNS = element_1.getAttributeNS;
-exports.setAttribute = element_1.setAttribute;
-exports.setAttributeNS = element_1.setAttributeNS;
-exports.removeAttribute = element_1.removeAttribute;
-exports.removeAttributeNS = element_1.removeAttributeNS;
-exports.querySelector = element_1.querySelector;
-exports.querySelectorAll = element_1.querySelectorAll;
-exports.getElementsByTagName = element_1.getElementsByTagName;
-exports.getElementsByClassName = element_1.getElementsByClassName;
-exports.getElementsByTagNameNS = element_1.getElementsByTagNameNS;
-exports.tagNameGetter = element_1.tagNameGetter;
-exports.tabIndexGetter = element_1.tabIndexGetter;
-exports.innerHTMLSetter = element_1.innerHTMLSetter;
-exports.matches = element_1.matches;
+__export(require("./../element")); // Pass through all the functions from element, we probably don't want those mocked
 //# sourceMappingURL=element.js.map

lib/env/document.d.ts

@@ -82,3 +82,3 @@ declare const DocumentPrototypeActiveElement: (this: Document) => Element | null;
     <E extends Element = Element>(selectors: string): NodeListOf<E>;
-}, getElementById: (elementId: string) => HTMLElement | null, getElementsByClassName: (classNames: string) => HTMLCollectionOf<Element>, getElementsByName: (elementName: string) => NodeListOf<HTMLElement>, getElementsByTagName: {
+}, getElementById: (elementId: string) => HTMLElement | null, getElementsByClassName: (classNames: string) => HTMLCollectionOf<Element>, getElementsByTagName: {
     <K extends "object" | "link" | "small" | "sub" | "sup" | "track" | "progress" | "a" | "abbr" | "address" | "applet" | "area" | "article" | "aside" | "audio" | "b" | "base" | "basefont" | "bdo" | "blockquote" | "body" | "br" | "button" | "canvas" | "caption" | "cite" | "code" | "col" | "colgroup" | "data" | "datalist" | "dd" | "del" | "details" | "dfn" | "dialog" | "dir" | "div" | "dl" | "dt" | "em" | "embed" | "fieldset" | "figcaption" | "figure" | "font" | "footer" | "form" | "frame" | "frameset" | "h1" | "h2" | "h3" | "h4" | "h5" | "h6" | "head" | "header" | "hgroup" | "hr" | "html" | "i" | "iframe" | "img" | "input" | "ins" | "kbd" | "label" | "legend" | "li" | "map" | "mark" | "marquee" | "menu" | "meta" | "meter" | "nav" | "noscript" | "ol" | "optgroup" | "option" | "output" | "p" | "param" | "picture" | "pre" | "q" | "rt" | "ruby" | "s" | "samp" | "script" | "section" | "select" | "slot" | "source" | "span" | "strong" | "style" | "table" | "tbody" | "td" | "template" | "textarea" | "tfoot" | "th" | "thead" | "time" | "title" | "tr" | "u" | "ul" | "var" | "video" | "wbr">(qualifiedName: K): HTMLCollectionOf<HTMLElementTagNameMap[K]>;
@@ -92,2 +92,3 @@ <K extends "symbol" | "circle" | "clipPath" | "defs" | "desc" | "ellipse" | "feBlend" | "feColorMatrix" | "feComponentTransfer" | "feComposite" | "feConvolveMatrix" | "feDiffuseLighting" | "feDisplacementMap" | "feDistantLight" | "feFlood" | "feFuncA" | "feFuncB" | "feFuncG" | "feFuncR" | "feGaussianBlur" | "feImage" | "feMerge" | "feMergeNode" | "feMorphology" | "feOffset" | "fePointLight" | "feSpecularLighting" | "feSpotLight" | "feTile" | "feTurbulence" | "filter" | "foreignObject" | "g" | "image" | "line" | "linearGradient" | "marker" | "mask" | "path" | "metadata" | "pattern" | "polygon" | "polyline" | "radialGradient" | "rect" | "svg" | "stop" | "switch" | "tspan" | "text" | "textPath" | "use" | "view">(qualifiedName: K): HTMLCollectionOf<SVGElementTagNameMap[K]>;
 };
+declare const getElementsByName: (elementName: string) => NodeListOf<HTMLElement>;
 export { elementFromPoint, createDocumentFragment, createElement, createElementNS, createTextNode, createComment, DocumentPrototypeActiveElement, querySelector, querySelectorAll, getElementById, getElementsByClassName, getElementsByName, getElementsByTagName, getElementsByTagNameNS, };

lib/env/document.js

@@ -16,3 +16,3 @@ "use strict";
 exports.elementFromPoint = elementFromPoint;
-const { createDocumentFragment, createElement, createElementNS, createTextNode, createComment, querySelector, querySelectorAll, getElementById, getElementsByClassName, getElementsByName, getElementsByTagName, getElementsByTagNameNS, } = Document.prototype;
+const { createDocumentFragment, createElement, createElementNS, createTextNode, createComment, querySelector, querySelectorAll, getElementById, getElementsByClassName, getElementsByTagName, getElementsByTagNameNS, } = Document.prototype;
 exports.createDocumentFragment = createDocumentFragment;
@@ -27,5 +27,8 @@ exports.createElement = createElement;
 exports.getElementsByClassName = getElementsByClassName;
-exports.getElementsByName = getElementsByName;
 exports.getElementsByTagName = getElementsByTagName;
 exports.getElementsByTagNameNS = getElementsByTagNameNS;
+// In Firefox v57 and lower, getElementsByName is defined on HTMLDocument.prototype
+// In all other browsers have the method on Document.prototype
+const { getElementsByName } = HTMLDocument.prototype;
+exports.getElementsByName = getElementsByName;
 //# sourceMappingURL=document.js.map

lib/env/dom.d.ts

 declare const ShadowRootHostGetter: (this: ShadowRoot) => Element | null;
-declare const ShadowRootInnerHTMLSetter: (this: ShadowRoot, s: string) => void;
 declare const dispatchEvent: (event: Event) => boolean;
@@ -9,2 +8,2 @@ declare const isNativeShadowRootAvailable: boolean;
 declare const focusEventRelatedTargetGetter: (this: FocusEvent) => EventTarget | null;
-export { dispatchEvent, ShadowRootHostGetter, ShadowRootInnerHTMLSetter, isNativeShadowRootAvailable, iFrameContentWindowGetter, eventTargetGetter, eventCurrentTargetGetter, focusEventRelatedTargetGetter, };
+export { dispatchEvent, ShadowRootHostGetter, isNativeShadowRootAvailable, iFrameContentWindowGetter, eventTargetGetter, eventCurrentTargetGetter, focusEventRelatedTargetGetter, };

lib/env/dom.js

@@ -16,8 +16,2 @@ "use strict";
 exports.ShadowRootHostGetter = ShadowRootHostGetter;
-const ShadowRootInnerHTMLSetter = typeof window.ShadowRoot !== 'undefined'
-    ? language_1.getOwnPropertyDescriptor(window.ShadowRoot.prototype, 'innerHTML').set
-    : () => {
-        throw new Error('Internal Error: Missing ShadowRoot');
-    };
-exports.ShadowRootInnerHTMLSetter = ShadowRootInnerHTMLSetter;
 const dispatchEvent = 'EventTarget' in window ? EventTarget.prototype.dispatchEvent : Node.prototype.dispatchEvent; // IE11
@@ -24,0 +18,0 @@ exports.dispatchEvent = dispatchEvent;

lib/env/element.d.ts

@@ -13,3 +13,3 @@ declare const hasAttribute: (qualifiedName: string) => boolean, getAttribute: (qualifiedName: string) => string | null, getAttributeNS: (namespace: string | null, localName: string) => string | null, setAttribute: (qualifiedName: string, value: string) => void, setAttributeNS: (namespace: string | null, qualifiedName: string, value: string) => void, removeAttribute: (qualifiedName: string) => void, removeAttributeNS: (namespace: string | null, localName: string) => void, querySelector: {
     (qualifiedName: string): HTMLCollectionOf<Element>;
-}, getElementsByClassName: (classNames: string) => HTMLCollectionOf<Element>, getElementsByTagNameNS: {
+}, getElementsByTagNameNS: {
     (namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
@@ -27,2 +27,3 @@ (namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
 declare const innerHTMLSetter: (this: Element, s: string) => void;
+declare const outerHTMLSetter: (this: Element, s: string) => void;
 declare const tagNameGetter: (this: Element) => string;
@@ -32,2 +33,3 @@ declare const tabIndexGetter: (this: HTMLElement) => number;
 declare const childrenGetter: (this: HTMLElement) => HTMLCollectionOf<Element>;
-export { addEventListener, removeEventListener, hasAttribute, getAttribute, getAttributeNS, setAttribute, setAttributeNS, removeAttribute, removeAttributeNS, querySelector, querySelectorAll, getBoundingClientRect, getElementsByTagName, getElementsByClassName, getElementsByTagNameNS, tagNameGetter, tabIndexGetter, innerHTMLSetter, matches, childrenGetter, };
+declare const getElementsByClassName: (classNames: string) => HTMLCollectionOf<Element>;
+export { addEventListener, removeEventListener, hasAttribute, getAttribute, getAttributeNS, setAttribute, setAttributeNS, removeAttribute, removeAttributeNS, querySelector, querySelectorAll, getBoundingClientRect, getElementsByTagName, getElementsByClassName, getElementsByTagNameNS, tagNameGetter, tabIndexGetter, innerHTMLSetter, outerHTMLSetter, matches, childrenGetter, };

lib/env/element.js

@@ -10,3 +10,3 @@ "use strict";
 const language_1 = require("../shared/language");
-const { hasAttribute, getAttribute, getAttributeNS, setAttribute, setAttributeNS, removeAttribute, removeAttributeNS, querySelector, querySelectorAll, getBoundingClientRect, getElementsByTagName, getElementsByClassName, getElementsByTagNameNS, } = Element.prototype;
+const { hasAttribute, getAttribute, getAttributeNS, setAttribute, setAttributeNS, removeAttribute, removeAttributeNS, querySelector, querySelectorAll, getBoundingClientRect, getElementsByTagName, getElementsByTagNameNS, } = Element.prototype;
 exports.hasAttribute = hasAttribute;
@@ -23,3 +23,2 @@ exports.getAttribute = getAttribute;
 exports.getElementsByTagName = getElementsByTagName;
-exports.getElementsByClassName = getElementsByClassName;
 exports.getElementsByTagNameNS = getElementsByTagNameNS;
@@ -41,2 +40,6 @@ let { addEventListener, removeEventListener } = Element.prototype;
 exports.innerHTMLSetter = innerHTMLSetter;
+const outerHTMLSetter = language_1.hasOwnProperty.call(Element.prototype, 'outerHTML')
+    ? language_1.getOwnPropertyDescriptor(Element.prototype, 'outerHTML').set
+    : language_1.getOwnPropertyDescriptor(HTMLElement.prototype, 'outerHTML').set; // IE11
+exports.outerHTMLSetter = outerHTMLSetter;
 const tagNameGetter = language_1.getOwnPropertyDescriptor(Element.prototype, 'tagName').get;
@@ -54,2 +57,6 @@ exports.tagNameGetter = tagNameGetter;
 exports.childrenGetter = childrenGetter;
+// for IE11, access from HTMLElement
+// for all other browsers access the method from the parent Element interface
+const { getElementsByClassName } = HTMLElement.prototype;
+exports.getElementsByClassName = getElementsByClassName;
 //# sourceMappingURL=element.js.map

lib/env/node.d.ts

@@ -6,3 +6,3 @@ declare const DOCUMENT_POSITION_CONTAINED_BY: number, DOCUMENT_POSITION_CONTAINS: number, DOCUMENT_POSITION_PRECEDING: number, DOCUMENT_POSITION_FOLLOWING: number, DOCUMENT_FRAGMENT_NODE: number;
 declare const textContextSetter: (this: Node, s: string) => void;
-declare const childNodesGetter: (this: Node) => NodeList;
+declare const childNodesGetter: (this: Node) => NodeListOf<Node & Element>;
 declare const nodeValueSetter: (this: Node, value: string) => void;
@@ -9,0 +9,0 @@ declare const nodeValueGetter: (this: Node) => string;

lib/faux-shadow/faux.d.ts

 export { patchEvent } from './events';
 export { PatchedSlotElement } from './slot';
-export { PatchedCustomElement } from './custom-element';
+export { PatchedElement } from './element';
 export { setCSSToken, PatchedNode } from './node';
 export { markElementAsPortal } from './portal';
-export { PatchedElement, PatchedIframeElement } from './traverse';
+export { PatchedIframeElement } from './iframe';

lib/faux-shadow/faux.js

@@ -13,4 +13,4 @@ "use strict";
 exports.PatchedSlotElement = slot_1.PatchedSlotElement;
-var custom_element_1 = require("./custom-element");
-exports.PatchedCustomElement = custom_element_1.PatchedCustomElement;
+var element_1 = require("./element");
+exports.PatchedElement = element_1.PatchedElement;
 var node_1 = require("./node");
@@ -21,5 +21,4 @@ exports.setCSSToken = node_1.setCSSToken;
 exports.markElementAsPortal = portal_1.markElementAsPortal;
-var traverse_1 = require("./traverse");
-exports.PatchedElement = traverse_1.PatchedElement;
-exports.PatchedIframeElement = traverse_1.PatchedIframeElement;
+var iframe_1 = require("./iframe");
+exports.PatchedIframeElement = iframe_1.PatchedIframeElement;
 //# sourceMappingURL=faux.js.map

lib/faux-shadow/iframe.d.ts

@@ -5,2 +5,8 @@ export interface HTMLIFrameElementConstructor {
 }
+/**
+ * This is needed for compat mode to function because we don't use a real WeakMap,
+ * instead compat will attempt to extract the proxy internal slot out of a cross
+ * domain iframe, just to see if it is a proxy or not, and that will throw. To prevent
+ * that from throwing, we just protect it by wrapping all iframes.
+ */
 export declare function wrapIframeWindow(win: Window): {
@@ -21,1 +27,2 @@ postMessage(): any;
 };
+export declare function PatchedIframeElement(elm: HTMLIFrameElement): HTMLIFrameElementConstructor;

lib/faux-shadow/iframe.js

 "use strict";
-/*
- * Copyright (c) 2018, salesforce.com, inc.
- * All rights reserved.
- * SPDX-License-Identifier: MIT
- * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+Object.defineProperty(exports, "__esModule", { value: true });
+const element_1 = require("./element");
+const dom_1 = require("../env/dom");
+/**
+ * This is needed for compat mode to function because we don't use a real WeakMap,
+ * instead compat will attempt to extract the proxy internal slot out of a cross
+ * domain iframe, just to see if it is a proxy or not, and that will throw. To prevent
+ * that from throwing, we just protect it by wrapping all iframes.
  */
-Object.defineProperty(exports, "__esModule", { value: true });
 function wrapIframeWindow(win) {
@@ -64,2 +66,16 @@ return {
 exports.wrapIframeWindow = wrapIframeWindow;
+function PatchedIframeElement(elm) {
+    const Ctor = element_1.PatchedElement(elm);
+    return class PatchedHTMLIframeElement extends Ctor {
+        get contentWindow() {
+            const original = dom_1.iFrameContentWindowGetter.call(this);
+            if (original) {
+                const wrapped = wrapIframeWindow(original);
+                return wrapped;
+            }
+            return original;
+        }
+    };
+}
+exports.PatchedIframeElement = PatchedIframeElement;
 //# sourceMappingURL=iframe.js.map

lib/faux-shadow/node.d.ts

@@ -1,2 +0,2 @@
-export interface NodeConstructor {
+interface NodeConstructor {
     prototype: Node;
@@ -21,1 +21,2 @@ new (): Node;
 export declare const getInternalChildNodes: (node: Node) => NodeListOf<ChildNode>;
+export {};

lib/faux-shadow/shadow-root.d.ts

 export declare function isDelegatingFocus(host: HTMLElement): boolean;
 export declare function getHost(root: SyntheticShadowRootInterface): HTMLElement;
 export declare function getShadowRoot(elm: HTMLElement): SyntheticShadowRootInterface;
+export declare function hasSyntheticShadow(elm: HTMLElement): boolean;
 export declare function attachShadow(elm: HTMLElement, options: ShadowRootInit): SyntheticShadowRootInterface;
@@ -5,0 +6,0 @@ export interface SyntheticShadowRootInterface extends ShadowRoot {

lib/faux-shadow/shadow-root.js

@@ -45,2 +45,6 @@ "use strict";
 exports.getShadowRoot = getShadowRoot;
+function hasSyntheticShadow(elm) {
+    return !language_1.isUndefined(fields_1.getInternalField(elm, InternalSlot));
+}
+exports.hasSyntheticShadow = hasSyntheticShadow;
 function attachShadow(elm, options) {
@@ -166,2 +170,38 @@ if (!language_1.isUndefined(fields_1.getInternalField(elm, InternalSlot))) {
 const NodePatchDescriptors = {
+    insertBefore: {
+        writable: true,
+        enumerable: true,
+        configurable: true,
+        value(newChild, refChild) {
+            node_1.insertBefore.call(getHost(this), newChild, refChild);
+            return newChild;
+        },
+    },
+    removeChild: {
+        writable: true,
+        enumerable: true,
+        configurable: true,
+        value(oldChild) {
+            node_1.removeChild.call(getHost(this), oldChild);
+            return oldChild;
+        },
+    },
+    appendChild: {
+        writable: true,
+        enumerable: true,
+        configurable: true,
+        value(newChild) {
+            node_1.appendChild.call(getHost(this), newChild);
+            return newChild;
+        },
+    },
+    replaceChild: {
+        writable: true,
+        enumerable: true,
+        configurable: true,
+        value(newChild, oldChild) {
+            node_1.replaceChild.call(getHost(this), newChild, oldChild);
+            return oldChild;
+        },
+    },
     addEventListener: {
@@ -168,0 +208,0 @@ writable: true,

lib/faux-shadow/slot.d.ts

@@ -1,2 +0,2 @@
-export interface HTMLSlotElementConstructor {
+interface HTMLSlotElementConstructor {
     prototype: HTMLSlotElement;
@@ -7,1 +7,2 @@ new (): HTMLSlotElement;
 export declare function PatchedSlotElement(elm: HTMLSlotElement): HTMLSlotElementConstructor;
+export {};

lib/faux-shadow/slot.js

@@ -22,2 +22,3 @@ "use strict";
 const static_html_collection_1 = require("../shared/static-html-collection");
+const element_2 = require("./element");
 // We can use a single observer without having to worry about leaking because
@@ -78,3 +79,3 @@ // "Registered observers in a node’s registered observer list have a weak
 function PatchedSlotElement(elm) {
-    const Ctor = traverse_1.PatchedElement(elm);
+    const Ctor = element_2.PatchedElement(elm);
     const { addEventListener: superAddEventListener } = elm;
@@ -81,0 +82,0 @@ return class PatchedHTMLSlotElement extends Ctor {

lib/faux-shadow/traverse.d.ts

@@ -1,5 +0,3 @@
-import { HTMLIFrameElementConstructor } from './iframe';
 import { SyntheticShadowRootInterface } from './shadow-root';
 import '../polyfills/node-get-root-node/main';
-import { HTMLElementConstructor } from './custom-element';
 export declare const patchedGetRootNode: (options?: GetRootNodeOptions | undefined) => Node;
@@ -11,6 +9,5 @@ export declare function getNodeOwner(node: Node): HTMLElement | null;
 export declare function getAllMatches(owner: HTMLElement, nodeList: NodeList | Node[]): Array<Element & Node>;
+export declare function getFirstMatch(owner: HTMLElement, nodeList: NodeList): Element | null;
 export declare function shadowRootQuerySelector(root: SyntheticShadowRootInterface, selector: string): Element | null;
 export declare function shadowRootQuerySelectorAll(root: SyntheticShadowRootInterface, selector: string): Element[];
 export declare function getFilteredChildNodes(node: Node): Element[];
-export declare function PatchedElement(elm: HTMLElement): HTMLElementConstructor;
-export declare function PatchedIframeElement(elm: HTMLIFrameElement): HTMLIFrameElementConstructor;

lib/faux-shadow/traverse.js

@@ -16,9 +16,5 @@ "use strict";
 const element_1 = require("../env/element");
-const iframe_1 = require("./iframe");
 const language_1 = require("../shared/language");
 const language_2 = require("../shared/language");
-const outer_html_1 = require("../3rdparty/polymer/outer-html");
 const shadow_root_1 = require("./shadow-root");
-const static_node_list_1 = require("../shared/static-node-list");
-const dom_1 = require("../env/dom");
 const slot_1 = require("./slot");
@@ -62,76 +58,2 @@ require("../polyfills/node-get-root-node/main");
 exports.isNodeOwnedBy = isNodeOwnedBy;
-// when finding a slot in the DOM, we can fold it if it is contained
-// inside another slot.
-function foldSlotElement(slot) {
-    let parent = node_2.parentElementGetter.call(slot);
-    while (!language_2.isNull(parent) && isSlotElement(parent)) {
-        slot = parent;
-        parent = node_2.parentElementGetter.call(slot);
-    }
-    return slot;
-}
-function isNodeSlotted(host, node) {
-    if (process.env.NODE_ENV !== 'production') {
-        assert_1.default.invariant(host instanceof HTMLElement, `isNodeSlotted() should be called with a host as the first argument instead of ${host}`);
-        assert_1.default.invariant(node instanceof Node, `isNodeSlotted() should be called with a node as the second argument instead of ${node}`);
-        assert_1.default.isTrue(node_2.compareDocumentPosition.call(node, host) & node_2.DOCUMENT_POSITION_CONTAINS, `isNodeSlotted() should never be called with a node that is not a child node of ${host}`);
-    }
-    const hostKey = node_1.getNodeKey(host);
-    // this routine assumes that the node is coming from a different shadow (it is not owned by the host)
-    // just in case the provided node is not an element
-    let currentElement = node instanceof Element ? node : node_2.parentElementGetter.call(node);
-    while (!language_2.isNull(currentElement) && currentElement !== host) {
-        const elmOwnerKey = node_1.getNodeNearestOwnerKey(currentElement);
-        const parent = node_2.parentElementGetter.call(currentElement);
-        if (elmOwnerKey === hostKey) {
-            // we have reached an element inside the host's template, and only if
-            // that element is an slot, then the node is considered slotted
-            // TODO: add the examples
-            return isSlotElement(currentElement);
-        }
-        else if (parent === host) {
-            return false;
-        }
-        else if (!language_2.isNull(parent) && node_1.getNodeNearestOwnerKey(parent) !== elmOwnerKey) {
-            // we are crossing a boundary of some sort since the elm and its parent
-            // have different owner key. for slotted elements, this is possible
-            // if the parent happens to be a slot.
-            if (isSlotElement(parent)) {
-                /**
-                 * the slot parent might be allocated inside another slot, think of:
-                 * <x-root> (<--- root element)
-                 *    <x-parent> (<--- own by x-root)
-                 *       <x-child> (<--- own by x-root)
-                 *           <slot> (<--- own by x-child)
-                 *               <slot> (<--- own by x-parent)
-                 *                  <div> (<--- own by x-root)
-                 *
-                 * while checking if x-parent has the div slotted, we need to traverse
-                 * up, but when finding the first slot, we skip that one in favor of the
-                 * most outer slot parent before jumping into its corresponding host.
-                 */
-                currentElement = getNodeOwner(foldSlotElement(parent));
-                if (!language_2.isNull(currentElement)) {
-                    if (currentElement === host) {
-                        // the slot element is a top level element inside the shadow
-                        // of a host that was allocated into host in question
-                        return true;
-                    }
-                    else if (node_1.getNodeNearestOwnerKey(currentElement) === hostKey) {
-                        // the slot element is an element inside the shadow
-                        // of a host that was allocated into host in question
-                        return true;
-                    }
-                }
-            }
-            else {
-                return false;
-            }
-        }
-        else {
-            currentElement = parent;
-        }
-    }
-    return false;
-}
 function shadowRootChildNodes(root) {
@@ -164,52 +86,3 @@ const elm = shadow_root_1.getHost(root);
 }
-function getAllSlottedMatches(host, nodeList) {
-    const filteredAndPatched = [];
-    for (let i = 0, len = nodeList.length; i < len; i += 1) {
-        const node = nodeList[i];
-        if (!isNodeOwnedBy(host, node) && isNodeSlotted(host, node)) {
-            language_1.ArrayPush.call(filteredAndPatched, node);
-        }
-    }
-    return filteredAndPatched;
-}
-function getFirstSlottedMatch(host, nodeList) {
-    for (let i = 0, len = nodeList.length; i < len; i += 1) {
-        const node = nodeList[i];
-        if (!isNodeOwnedBy(host, node) && isNodeSlotted(host, node)) {
-            return node;
-        }
-    }
-    return null;
-}
-function lightDomQuerySelectorAll(elm, selectors) {
-    const owner = getNodeOwner(elm);
-    if (language_2.isNull(owner)) {
-        return [];
-    }
-    const nodeList = element_1.querySelectorAll.call(elm, selectors);
-    if (node_1.getNodeKey(elm)) {
-        // it is a custom element, and we should then filter by slotted elements
-        return getAllSlottedMatches(elm, nodeList);
-    }
-    else {
-        // regular element, we should then filter by ownership
-        return getAllMatches(owner, nodeList);
-    }
-}
-function lightDomQuerySelector(elm, selector) {
-    const owner = getNodeOwner(elm);
-    if (language_2.isNull(owner)) {
-        // the it is a root, and those can't have a lightdom
-        return null;
-    }
-    const nodeList = element_1.querySelectorAll.call(elm, selector);
-    if (node_1.getNodeKey(elm)) {
-        // it is a custom element, and we should then filter by slotted elements
-        return getFirstSlottedMatch(elm, nodeList);
-    }
-    else {
-        // regular element, we should then filter by ownership
-        return getFirstMatch(owner, nodeList);
-    }
-}
+exports.getFirstMatch = getFirstMatch;
 function shadowRootQuerySelector(root, selector) {
@@ -260,48 +133,2 @@ const elm = shadow_root_1.getHost(root);
 exports.getFilteredChildNodes = getFilteredChildNodes;
-function PatchedElement(elm) {
-    const Ctor = node_1.PatchedNode(elm);
-    // Note: Element.getElementsByTagName and Element.getElementsByClassName are purposefully
-    // omitted from the list of patched methods. In order for the querySelector* APIs to run
-    // properly in jsdom, we need to make sure those methods doesn't respect the shadow DOM
-    // semantic.
-    // https://github.com/salesforce/lwc/pull/1179#issuecomment-484041707
-    return class PatchedHTMLElement extends Ctor {
-        querySelector(selector) {
-            return lightDomQuerySelector(this, selector);
-        }
-        querySelectorAll(selectors) {
-            return static_node_list_1.createStaticNodeList(lightDomQuerySelectorAll(this, selectors));
-        }
-        get innerHTML() {
-            const childNodes = node_1.getInternalChildNodes(this);
-            let innerHTML = '';
-            for (let i = 0, len = childNodes.length; i < len; i += 1) {
-                innerHTML += outer_html_1.getOuterHTML(childNodes[i]);
-            }
-            return innerHTML;
-        }
-        set innerHTML(value) {
-            element_1.innerHTMLSetter.call(this, value);
-        }
-        get outerHTML() {
-            return outer_html_1.getOuterHTML(this);
-        }
-    };
-}
-exports.PatchedElement = PatchedElement;
-function PatchedIframeElement(elm) {
-    const Ctor = PatchedElement(elm);
-    // @ts-ignore type-mismatch
-    return class PatchedHTMLIframeElement extends Ctor {
-        get contentWindow() {
-            const original = dom_1.iFrameContentWindowGetter.call(this);
-            if (original) {
-                const wrapped = iframe_1.wrapIframeWindow(original);
-                return wrapped;
-            }
-            return original;
-        }
-    };
-}
-exports.PatchedIframeElement = PatchedIframeElement;
 //# sourceMappingURL=traverse.js.map

lib/index.d.ts

 import './polyfills/document-shadow/main';
+import './polyfills/document-body-shadow/main';
 import './polyfills/shadow-root/main';
@@ -3,0 +4,0 @@ import './polyfills/click-event-composed/main';

lib/index.js

@@ -14,2 +14,3 @@ "use strict";
 require("./polyfills/document-shadow/main");
+require("./polyfills/document-body-shadow/main");
 require("./polyfills/shadow-root/main");
@@ -16,0 +17,0 @@ require("./polyfills/click-event-composed/main"); // must come before event-composed

lib/polyfills/document-shadow/polyfill.js

@@ -15,2 +15,4 @@ "use strict";
 const path_composer_1 = require("../../3rdparty/polymer/path-composer");
+const static_node_list_1 = require("../../shared/static-node-list");
+const static_html_collection_1 = require("../../shared/static-html-collection");
 function apply() {
@@ -48,4 +50,98 @@ function elemFromPoint(left, top) {
     });
+    // The following patched methods hide shadowed elements from global
+    // traversing mechanisms. They are simplified for performance reasons to
+    // filter by ownership and do not account for slotted elements. This
+    // compromise is fine for our synthetic shadow dom because root elements
+    // cannot have slotted elements.
+    // Another compromise here is that all these traversing methods will return
+    // static HTMLCollection or static NodeList. We decided that this compromise
+    // is not a big problem considering the amount of code that is relying on
+    // the liveliness of these results are rare.
+    language_1.defineProperty(Document.prototype, 'getElementById', {
+        value() {
+            const elm = document_1.getElementById.apply(this, language_1.ArraySlice.call(arguments));
+            if (language_1.isNull(elm)) {
+                return null;
+            }
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            return node_1.getNodeOwnerKey(elm) === ownerKey ? elm : null;
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(Document.prototype, 'querySelector', {
+        value() {
+            const elements = document_1.querySelectorAll.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFind.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            return !language_1.isUndefined(filtered) ? filtered : null;
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(Document.prototype, 'querySelectorAll', {
+        value() {
+            const elements = document_1.querySelectorAll.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFilter.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            return static_node_list_1.createStaticNodeList(filtered);
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(Document.prototype, 'getElementsByClassName', {
+        value() {
+            const elements = document_1.getElementsByClassName.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFilter.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            return static_html_collection_1.createStaticHTMLCollection(filtered);
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(Document.prototype, 'getElementsByTagName', {
+        value() {
+            const elements = document_1.getElementsByTagName.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFilter.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            // NodeList because of https://bugzilla.mozilla.org/show_bug.cgi?id=14869
+            return static_node_list_1.createStaticNodeList(filtered);
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(Document.prototype, 'getElementsByTagNameNS', {
+        value() {
+            const elements = document_1.getElementsByTagNameNS.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFilter.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            // NodeList because of https://bugzilla.mozilla.org/show_bug.cgi?id=14869
+            return static_node_list_1.createStaticNodeList(filtered);
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
+    language_1.defineProperty(
+    // In Firefox v57 and lower, getElementsByName is defined on HTMLDocument.prototype
+    language_1.getOwnPropertyDescriptor(HTMLDocument.prototype, 'getElementsByName')
+        ? HTMLDocument.prototype
+        : Document.prototype, 'getElementsByName', {
+        value() {
+            const elements = document_1.getElementsByName.apply(this, language_1.ArraySlice.call(arguments));
+            const ownerKey = node_1.getNodeOwnerKey(this);
+            const filtered = language_1.ArrayFilter.call(elements, elm => node_1.getNodeOwnerKey(elm) === ownerKey);
+            return static_node_list_1.createStaticNodeList(filtered);
+        },
+        writable: true,
+        enumerable: true,
+        configurable: true,
+    });
 }
 exports.default = apply;
 //# sourceMappingURL=polyfill.js.map

lib/polyfills/mutation-observer/polyfill.js

@@ -15,4 +15,4 @@ "use strict";
 // Internal fields to maintain relationships
-const observedTargetsField = '$$lwcObservedTargets$$';
 const wrapperLookupField = '$$lwcObserverCallbackWrapper$$';
+const observerLookupField = '$$lwcNodeObservers$$';
 /**
@@ -58,9 +58,26 @@ * Retarget the mutation record's target value to its shadowRoot
 /**
- * This function first gathers the OwnerKey of all the targets observed by the MutationObserver instance.
- * Next, process each MutationRecord to determine if the mutation occured in the same shadow tree as
- * one of the targets being observed.
+ * Utility to identify if a target node is being observed by the given observer
+ * Start at the current node, if the observer is registered to observe the current node, the mutation qualifies
+ * @param {MutationObserver} observer
+ * @param {Node} target
+ */
+function isQualifiedObserver(observer, target) {
+    let parentNode = target;
+    while (!language_1.isNull(parentNode)) {
+        const parentNodeObservers = parentNode[observerLookupField];
+        if (!language_1.isUndefined(parentNodeObservers) &&
+            (parentNodeObservers[0] === observer || // perf optimization to check for the first item is a match
+                language_1.ArrayIndexOf.call(parentNodeObservers, observer) !== -1)) {
+            return true;
+        }
+        parentNode = parentNode.parentNode;
+    }
+    return false;
+}
+/**
+ * This function provides a shadow dom compliant filtered view of mutation records for a given observer.
  *
- * The key filtering logic is to match the observed target node's ownerKey/ownKey with the ownerKey of the nodes in the
- * MutationRecord.
- * The ownerKey of the rootnode will be undefined. Similarly ownerkey of nodes outside the shadow will be undefined.
+ * The key logic here is to determine if a given observer has been registered to observe any nodes
+ * between the target node of a mutation record to the target's root node.
+ * This function also retargets records when mutations occur directly under the shadow root
  * @param {MutationRecords[]} mutations
@@ -70,28 +87,42 @@ * @param {MutationObserver} observer
 function filterMutationRecords(mutations, observer) {
-    const observedTargets = observer[observedTargetsField];
-    const observedTargetOwnerKeys = [];
-    language_1.forEach.call(observedTargets, (node) => {
-        // If the observed target is a shadowRoot, the ownerkey of the shadow tree will be fetched using the host
-        const observedTargetOwnerKey = node instanceof window.ShadowRoot
-            ? node_1.getNodeKey(node.host)
-            : node_1.getNodeNearestOwnerKey(node);
-        language_1.ArrayPush.call(observedTargetOwnerKeys, observedTargetOwnerKey);
-    });
     return language_1.ArrayReduce.call(mutations, (filteredSet, record) => {
         const { target, addedNodes, removedNodes, type } = record;
-        // If the mutations affected a lwc host element or its shadow,
-        // because LWC uses synthetic shadow, target will be the host
+        // If target is an lwc host,
+        // Determine if the mutations affected the host or the shadowRoot
+        // Mutations affecting host: changes to slot content
+        // Mutations affecting shadowRoot: changes to template content
         if (type === 'childList' && !language_1.isUndefined(node_1.getNodeKey(target))) {
-            // Optimization: Peek in and test one node to decide if the MutationRecord qualifies
-            // The remaining nodes in this MutationRecord will have the same ownerKey
-            const sampleNode = addedNodes.length > 0 ? addedNodes[0] : removedNodes[0];
-            const sampleNodeOwnerKey = node_1.getNodeNearestOwnerKey(sampleNode);
-            // Is node being added/removed to a subtree that is being observed
-            if (language_1.ArrayIndexOf.call(observedTargetOwnerKeys, sampleNodeOwnerKey) !== -1) {
-                // If the target was being observed, then return record as-is
-                if (observedTargets.indexOf(target) !== -1) {
+            // In case of added nodes, we can climb up the tree and determine eligibility
+            if (addedNodes.length > 0) {
+                // Optimization: Peek in and test one node to decide if the MutationRecord qualifies
+                // The remaining nodes in this MutationRecord will have the same ownerKey
+                const sampleNode = addedNodes[0];
+                if (isQualifiedObserver(observer, sampleNode)) {
+                    // If the target was being observed, then return record as-is
+                    // this will be the case for slot content
+                    if (target[observerLookupField] &&
+                        (target[observerLookupField][0] === observer ||
+                            language_1.ArrayIndexOf.call(target[observerLookupField], observer) !== -1)) {
+                        language_1.ArrayPush.call(filteredSet, record);
+                    }
+                    else {
+                        // else, must be observing the shadowRoot
+                        language_1.ArrayPush.call(filteredSet, retargetMutationRecord(record));
+                    }
+                }
+            }
+            else {
+                // In the case of removed nodes, climbing the tree is not an option as the nodes are disconnected
+                // We can only check if either the host or shadow root was observed and qualify the record
+                const shadowRoot = target.shadowRoot;
+                const sampleNode = removedNodes[0];
+                if (node_1.getNodeNearestOwnerKey(target) === node_1.getNodeNearestOwnerKey(sampleNode) && // trickery: sampleNode is slot content
+                    isQualifiedObserver(observer, target) // use target as a close enough reference to climb up
+                ) {
                     language_1.ArrayPush.call(filteredSet, record);
                 }
-                else {
-                    // else, must be observing the shadowRoot
+                else if (shadowRoot &&
+                    shadowRoot[observerLookupField] &&
+                    (shadowRoot[observerLookupField][0] === observer ||
+                        language_1.ArrayIndexOf.call(shadowRoot[observerLookupField], observer) !== -1)) {
                     language_1.ArrayPush.call(filteredSet, retargetMutationRecord(record));
@@ -102,9 +133,5 @@ }
         else {
-            // if target is shadowRoot, then fetch key of shadow tree from the host
-            // this should never be the case when synthetic shadow is on, only when running in native
-            const recordTargetOwnerKey = target instanceof window.ShadowRoot
-                ? node_1.getNodeKey(target.host)
-                : node_1.getNodeNearestOwnerKey(target);
-            const mutationInScope = language_1.ArrayIndexOf.call(observedTargetOwnerKeys, recordTargetOwnerKey) !== -1;
-            if (mutationInScope) {
+            // Mutation happened under a root node(shadow root or document) and the decision is straighforward
+            // Ascend the tree starting from target and check if observer is qualified
+            if (isQualifiedObserver(observer, target)) {
                 language_1.ArrayPush.call(filteredSet, record);
@@ -140,9 +167,5 @@ }
     const observer = new OriginalMutationObserver(wrappedCallback);
-    language_1.defineProperty(observer, observedTargetsField, { value: [] });
     return observer;
 }
 function patchedDisconnect() {
-    if (!language_1.isUndefined(this[observedTargetsField])) {
-        this[observedTargetsField].length = 0;
-    }
     originalDisconnect.call(this);
@@ -157,6 +180,7 @@ }
 function patchedObserve(target, options) {
-    // If the observer was created by the patched constructor, this field should be defined. Adding a guard for extra safety
-    if (!language_1.isUndefined(this[observedTargetsField])) {
-        language_1.ArrayPush.call(this[observedTargetsField], target);
+    // Maintain a list of all observers that want to observe a node
+    if (language_1.isUndefined(target[observerLookupField])) {
+        language_1.defineProperty(target, observerLookupField, { value: [] });
     }
+    language_1.ArrayPush.call(target[observerLookupField], this);
     // If the target is a SyntheticShadowRoot, observe the host since the shadowRoot is an empty documentFragment
@@ -163,0 +187,0 @@ if (target instanceof shadow_root_1.SyntheticShadowRoot) {

lib/shared/language.d.ts

@@ -21,2 +21,5 @@ declare const freeze: {
     (callbackfn: (value: any, index: number, array: any[]) => any, thisArg?: any): any[];
+}, ArrayFind: {
+    <S extends any>(predicate: (this: void, value: any, index: number, obj: any[]) => value is S, thisArg?: any): S | undefined;
+    (predicate: (value: any, index: number, obj: any[]) => boolean, thisArg?: any): any;
 }, ArraySlice: (start?: number | undefined, end?: number | undefined) => any[], ArraySplice: {
@@ -45,3 +48,3 @@ (start: number, deleteCount?: number | undefined): any[];
 };
-export { StringToLowerCase, StringReplace, StringIndexOf, StringCharCodeAt, StringSlice, StringSplit, freeze, seal, keys, create, assign, defineProperty, defineProperties, getPrototypeOf, setPrototypeOf, getOwnPropertyDescriptor, getOwnPropertyNames, getOwnPropertySymbols, hasOwnProperty, preventExtensions, isExtensible, ArrayReduce, ArraySlice, ArraySplice, ArrayUnshift, ArrayFilter, ArrayMap, ArrayJoin, ArrayConcat, isArray, ArrayIndexOf, ArrayPush, ArrayReverse, forEach, };
+export { StringToLowerCase, StringReplace, StringIndexOf, StringCharCodeAt, StringSlice, StringSplit, freeze, seal, keys, create, assign, defineProperty, defineProperties, getPrototypeOf, setPrototypeOf, getOwnPropertyDescriptor, getOwnPropertyNames, getOwnPropertySymbols, hasOwnProperty, preventExtensions, isExtensible, ArrayFind, ArrayReduce, ArraySlice, ArraySplice, ArrayUnshift, ArrayFilter, ArrayMap, ArrayJoin, ArrayConcat, isArray, ArrayIndexOf, ArrayPush, ArrayReverse, forEach, };
 export declare function isUndefined(obj: any): obj is undefined;
@@ -48,0 +51,0 @@ export declare function isNull(obj: any): obj is null;

lib/shared/language.js

@@ -27,5 +27,6 @@ "use strict";
 exports.isArray = isArray;
-const { concat: ArrayConcat, filter: ArrayFilter, slice: ArraySlice, splice: ArraySplice, unshift: ArrayUnshift, indexOf: ArrayIndexOf, push: ArrayPush, map: ArrayMap, join: ArrayJoin, forEach, reduce: ArrayReduce, reverse: ArrayReverse, } = Array.prototype;
+const { concat: ArrayConcat, filter: ArrayFilter, find: ArrayFind, slice: ArraySlice, splice: ArraySplice, unshift: ArrayUnshift, indexOf: ArrayIndexOf, push: ArrayPush, map: ArrayMap, join: ArrayJoin, forEach, reduce: ArrayReduce, reverse: ArrayReverse, } = Array.prototype;
 exports.ArrayConcat = ArrayConcat;
 exports.ArrayFilter = ArrayFilter;
+exports.ArrayFind = ArrayFind;
 exports.ArraySlice = ArraySlice;
@@ -32,0 +33,0 @@ exports.ArraySplice = ArraySplice;

package.json

 {
     "name": "@lwc/synthetic-shadow",
-    "version": "0.37.3-alpha9",
+    "version": "0.37.4-alpha1",
     "description": "Synthetic Shadow Root for LWC",
@@ -22,3 +22,3 @@ "license": "MIT",
     },
-    "gitHead": "47b5590bcc9f1b43fc4e5524a30c1fae042b20d7"
+    "gitHead": "29fc327b8cfa8b258413bace39d18798a4b9ff61"
 }

No alert changes

Improved metrics

Total package byte prevSize

1447804

increased by9.48%

Number of package files

196

increased by4.81%

Lines of code

30369

increased by8.32%

No dependency changes