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import {type as typeMethod} from '../type'import {_indexOf} from '../equals'
export class _Set {  constructor() {    this.set = new Set()    this.items = {}  }  checkUniqueness(item) {    const type = typeMethod(item)    if (['Null', 'Undefined', 'NaN'].includes(type)) {      if (type in this.items) {        return false      }      this.items[type] = true      return true    }    if (!['Object', 'Array'].includes(type)) {      const prevSize = this.set.size      this.set.add(item)      return this.set.size !== prevSize    }
    if (!(type in this.items)) {      this.items[type] = [item]      return true    }
    if (_indexOf(item, this.items[type]) === -1) {      this.items[type].push(item)      return true    }    return false  }}