loose-equal.js

function isObject(obj) {
  return obj !== null && typeof obj === 'object'
}

export default function looseEqual(a, b) {
  if (a === b) return true
  const isObjectA = isObject(a)
  const isObjectB = isObject(b)
  if (isObjectA && isObjectB) {
    try {
      const isArrayA = Array.isArray(a)
      const isArrayB = Array.isArray(b)
      if (isArrayA && isArrayB) {
        return (
          a.length === b.length &&
          a.every((e, i) => {
            return looseEqual(e, b[i])
          })
        )
      } else if (a instanceof Date && b instanceof Date) {
        return a.getTime() === b.getTime()
      } else if (!isArrayA && !isArrayB) {
        const keysA = Object.keys(a)
        const keysB = Object.keys(b)
        return (
          keysA.length === keysB.length &&
          keysA.every(key => {
            return looseEqual(a[key], b[key])
          })
        )
      } else {
        return false
      }
    } catch (e) {
      return false
    }
  } else if (!isObjectA && !isObjectB) {
    return String(a) === String(b)
  } else {
    return false
  }
}