How to use the jju.parse function in jju

export function _parseRushJson(rushJsonContents: string): RushJson | undefined {
  try {
    // rush.json can contain comments, so we have to use a json library which supports comments
    // (instead of JSON.parse/JSON.stringify)
    return jju.parse(rushJsonContents, { mode: 'cjson' });
  } catch {
    return undefined;
  }
}

public static load(jsonFilename: string): any {
    // tslint:disable-line:no-any
    if (!FileSystem.exists(jsonFilename)) {
      throw new Error(`Input file not found: ${jsonFilename}`);
    }

    const contents: string = FileSystem.readFile(jsonFilename);
    try {
      return jju.parse(contents);
    } catch (error) {
      throw new Error(`Error reading "${jsonFilename}":` + os.EOL + `  ${error.message}`);
    }
  }

it('parses file', () => {
    const rushJsonParsed = jju.parse(rushJsonStr, { mode: 'cjson' });
    expect(_parseRushJson(rushJsonStr)).toEqual(rushJsonParsed);
  });
});

function readConfig(file) {
  file = findConfig(file);
  if (file && fs.existsSync(file)) {
    return jju.parse(fs.readFileSync(file, 'utf8'));
  }
}

function update_deps() {
   var items = $('#dependencies').val()
   if (items === _old_items) return
   _old_items = items
   
   var deps = {}
   var json = jju.parse($('textarea').val())
   $('#dependencies').tagsinput('items').forEach(function(x) {
    deps[x] = (json.dependencies && json.dependencies[x]) || '*'
   })
   on_input_update('dependencies', deps)
  }
 })()

function loadJsonFile(jsonFileName) {
  try {
    const buffer = fs.readFileSync(jsonFileName)
    const jju = require('jju')
    return jju.parse(buffer.toString())
  } catch (error) {
    throw new Error(
      `Error reading "${jsonFileName}":${os.EOL}  ${error.message}`
    )
  }
}

'package.json5': function json2json(data) {
		var JSON5 = require('jju')
		return JSON.stringify(JSON5.parse(data.toString('utf8')))
	},

const readjsonSync = (name) => {
    return jju.parse(fs.readFileSync(name, 'utf8'), {
        mode: 'json',
    });
};

function on_input_update(name, value) {
 var old_text = $('textarea').val()
 var json = jju.parse(old_text)
 
 if (value === '') {
  delete json[name]
 } else {
  json[name] = value
 }
 $('textarea').val(jju.update(old_text, json))
}
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