为什么我不能从aws Lambda函数中看到这个aws sdk函数?

我的目标是能够使用AWS CloudWatchLogs.startQuery 我的AWS Lambda处理程序函数中的函数。当我通过nodejs在本地运行该方法时,它就存在了,但当我在处理程序中运行时,它是未定义的。我想我在这两个地方做了同样的事情,但是我得到了不同的结果。作为比较,我可以看到 filterLogEvents AWS javascript SDK

我的nodejs代码:

var AWS = require('aws-sdk');
AWS.config.loadFromPath('./aws_credentials.json');
AWS.config.update({
    region: 'us-east-1',
    apiVersion: '2014-03-28'
});

var cloudwatchlogs = new AWS.CloudWatchLogs();
var filterlogevents_type = typeof cloudwatchlogs.filterLogEvents;
var startquery_type = typeof cloudwatchlogs.startQuery;

console.log(startquery_type);      // function 
console.log(filterlogevents_type); // function

var AWS = require('aws-sdk');
AWS.config.update({
    region: 'us-east-1',
    apiVersion: '2014-03-28'
});
exports.handler = async (event) => {
    var cloudwatchlogs = new AWS.CloudWatchLogs();
    var filterlogevents_type = typeof cloudwatchlogs.filterLogEvents;
    var startquery_type = typeof cloudwatchlogs.startQuery;

    const response = {
        body: JSON.stringify({
            startQuery: startquery_type,           // undefined
            filterLogEvents: filterlogevents_type  // function
        }),
    };
    return response;
};