old_contents: /**
  * Represents the core APIs of the DOM.
  */
  export const _DOM = {
    boundary: 'aurelia-dom-boundary',
    addEventListener(eventName: string, callback: Function, capture?: boolean): void {
      throw new self.DOMException('addEventListener is not available in a service/web worker');
    },
    removeEventListener(eventName: string, callback: Function, capture?: boolean): void {
      throw new self.DOMException('removeEventListener is not available in a service/web worker');
    },
    adoptNode(node: Node) {
      throw new self.DOMException('adoptNode is not available in a service/web worker');
    },
    createElement(tagName: string): Element {
      throw new self.DOMException('createElement is not available in a service/web worker');
    },
    createTextNode(text) {
      throw new self.DOMException('createTextNode is not available in a service/web worker');
    },
    createComment(text) {
      throw new self.DOMException('createComment is not available in a service/web worker');
    },
    createDocumentFragment(): DocumentFragment {
      throw new self.DOMException('createDocumentFragment is not available in a service/web worker');
    },
    createMutationObserver(callback: Function): MutationObserver {
      throw new self.DOMException('createMutationObserver is not available in a service/web worker');
    },
    createCustomEvent(eventType: string, options: Object): CustomEvent {
      throw new self.DOMException('createCustomEvent is not available in a service/web worker');
    },
    dispatchEvent(evt): void {
      throw new self.DOMException('getComputedStyle is not available in a service/web worker');
    },
    getComputedStyle(element: Element) {
      throw new self.DOMException('getComputedStyle is not available in a service/web worker');
    },
    getElementById(id: string): Element {
      throw new self.DOMException('getElementById is not available in a service/web worker');
    },
    querySelectorAll(query: string) {
      throw new self.DOMException('querySelectorAll is not available in a service/web worker');
    },
    nextElementSibling(element: Node): Element {
      throw new self.DOMException('nextElementSibling is not available in a service/web worker');
    },
    createTemplateFromMarkup(markup: string): Element {
      throw new self.DOMException('createTemplateFromMarkup is not available in a service/web worker');
    },
    appendNode(newNode: Node, parentNode?: Node): void {
      throw new self.DOMException('appendNode is not available in a service/web worker');
    },
    replaceNode(newNode: Node, node: Node, parentNode?: Node): void {
      throw new self.DOMException('replaceNode is not available in a service/web worker');
    },
    removeNode(node: Node, parentNode?: Node): void {
      throw new self.DOMException('removeNode is not available in a service/web worker');
    },
    injectStyles(styles: string, destination?: Element, prepend?: boolean): Node {
      throw new self.DOMException('injectStyles is not available in a service/web worker');
    }
  };
  
new_contents: /**
  * Represents the core APIs of the DOM.
  */
  export const _DOM = {
    boundary: 'aurelia-dom-boundary',
    addEventListener(eventName: string, callback: Function, capture?: boolean): void {
      throw new self.DOMException('addEventListener is not available in a service/web worker');
    },
    removeEventListener(eventName: string, callback: Function, capture?: boolean): void {
      throw new self.DOMException('removeEventListener is not available in a service/web worker');
    },
    adoptNode(node: Node) {
      throw new self.DOMException('adoptNode is not available in a service/web worker');
    },
    createElement(tagName: string): Element {
      throw new self.DOMException('createElement is not available in a service/web worker');
    },
    createAttribute(name: string): Attr {
      throw new self.DOMException('createAttribute is not available in a service/web worker');
    },
    createTextNode(text) {
      throw new self.DOMException('createTextNode is not available in a service/web worker');
    },
    createComment(text) {
      throw new self.DOMException('createComment is not available in a service/web worker');
    },
    createDocumentFragment(): DocumentFragment {
      throw new self.DOMException('createDocumentFragment is not available in a service/web worker');
    },
    createMutationObserver(callback: Function): MutationObserver {
      throw new self.DOMException('createMutationObserver is not available in a service/web worker');
    },
    createCustomEvent(eventType: string, options: Object): CustomEvent {
      throw new self.DOMException('createCustomEvent is not available in a service/web worker');
    },
    dispatchEvent(evt): void {
      throw new self.DOMException('getComputedStyle is not available in a service/web worker');
    },
    getComputedStyle(element: Element) {
      throw new self.DOMException('getComputedStyle is not available in a service/web worker');
    },
    getElementById(id: string): Element {
      throw new self.DOMException('getElementById is not available in a service/web worker');
    },
    querySelectorAll(query: string) {
      throw new self.DOMException('querySelectorAll is not available in a service/web worker');
    },
    nextElementSibling(element: Node): Element {
      throw new self.DOMException('nextElementSibling is not available in a service/web worker');
    },
    createTemplateFromMarkup(markup: string): Element {
      throw new self.DOMException('createTemplateFromMarkup is not available in a service/web worker');
    },
    appendNode(newNode: Node, parentNode?: Node): void {
      throw new self.DOMException('appendNode is not available in a service/web worker');
    },
    replaceNode(newNode: Node, node: Node, parentNode?: Node): void {
      throw new self.DOMException('replaceNode is not available in a service/web worker');
    },
    removeNode(node: Node, parentNode?: Node): void {
      throw new self.DOMException('removeNode is not available in a service/web worker');
    },
    injectStyles(styles: string, destination?: Element, prepend?: boolean): Node {
      throw new self.DOMException('injectStyles is not available in a service/web worker');
    }
  };
  
subject: implement createAttribute