jsoneditor/src/js/polyfills.js

A web-based tool to view, edit, format, and validate JSON

if (typeof Element !== 'undefined') {
  // Polyfill for array remove
  (() => {
    function polyfill (item) {
      if (typeof item !== 'undefined') {
        if ('remove' in item) {
          return
        }
        Object.defineProperty(item, 'remove', {
          configurable: true,
          enumerable: true,
          writable: true,
          value: function remove () {
            if (this.parentNode !== undefined) { this.parentNode.removeChild(this) }
          }
        })
      }
    }

    if (typeof window.Element !== 'undefined') { polyfill(window.Element.prototype) }
    if (typeof window.CharacterData !== 'undefined') { polyfill(window.CharacterData.prototype) }
    if (typeof window.DocumentType !== 'undefined') { polyfill(window.DocumentType.prototype) }
  })()
}

// simple polyfill for Array.findIndex
if (!Array.prototype.findIndex) {
  // eslint-disable-next-line no-extend-native
  Object.defineProperty(Array.prototype, 'findIndex', {
    value: function (predicate) {
      for (let i = 0; i < this.length; i++) {
        const element = this[i]
        if (predicate.call(this, element, i, this)) {
          return i
        }
      }
      return -1
    },
    configurable: true,
    writable: true
  })
}

// Polyfill for Array.find
if (!Array.prototype.find) {
  // eslint-disable-next-line no-extend-native
  Object.defineProperty(Array.prototype, 'find', {
    value: function (predicate) {
      const i = this.findIndex(predicate)
      return this[i]
    },
    configurable: true,
    writable: true
  })
}

// Polyfill for String.trim
if (!String.prototype.trim) {
  // eslint-disable-next-line no-extend-native
  String.prototype.trim = function () {
    return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '')
  }
}