How to use the text-buffer.Point.ZERO function in text-buffer

const _ = require('underscore-plus')
const Grim = require('grim')
const FirstMate = require('first-mate')
const {Disposable, CompositeDisposable} = require('event-kit')
const TextMateLanguageMode = require('./text-mate-language-mode')
const Token = require('./token')
const fs = require('fs-plus')
const {Point, Range} = require('text-buffer')

const GRAMMAR_SELECTION_RANGE = Range(Point.ZERO, Point(10, 0)).freeze()
const PATH_SPLIT_REGEX = new RegExp('[/.]')

// Extended: This class holds the grammars used for tokenizing.
//
// An instance of this class is always available as the `atom.grammars` global.
module.exports =
class GrammarRegistry {
  constructor ({config} = {}) {
    this.config = config
    this.subscriptions = new CompositeDisposable()
    this.textmateRegistry = new FirstMate.GrammarRegistry({maxTokensPerLine: 100, maxLineLength: 1000})
    this.clear()
  }

  clear () {
    this.textmateRegistry.clear()