@antv/x6/src/common/polyfill/index.ts

JavaScript diagramming library that uses SVG and HTML for rendering

export function forEachPolyfill(arr) {
  arr.forEach((item) => {
    if (Object.hasOwn(item, 'append')) {
      return
    }
    Object.defineProperty(item, 'append', {
      configurable: true,
      enumerable: true,
      writable: true,
      value(...args: any[]) {
        const docFrag = document.createDocumentFragment()

        args.forEach((arg: any) => {
          const isNode = arg instanceof Node
          docFrag.appendChild(
            isNode ? arg : document.createTextNode(String(arg)),
          )
        })

        this.appendChild(docFrag)
      },
    })
  })
}

// compatible with NodeList.prototype.forEach() before chrome 51
// https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach
if (
  typeof window === 'object' &&
  window.NodeList &&
  !NodeList.prototype.forEach
) {
  NodeList.prototype.forEach = Array.prototype.forEach as any
}

// compatible with ParentNode.append() before chrome 54
// https://github.com/jserz/js_piece/blob/master/DOM/ParentNode/append()/append().md
if (typeof window !== 'undefined') {
  ;((arr) => {
    forEachPolyfill(arr)
  })([Element.prototype, Document.prototype, DocumentFragment.prototype])
}