how to call multiples events in aws lambda function

1exports.handler = async (event, context, callback) => {
2    const type = event.type;
3    if (type === 'all') {
4        const params = {
5            TableName: 'compare-yourself'
6        }
7        try {
8            const data = await dynamodb.scan(params).promise()
9            callback(null, data)
10        } catch(error) {
11            callback(error);
12        }
13    } else if (type === 'single') {
14        callback(null, 'Just my data');
15    } else {
16        callback(null, 'Hello from Lambda');
17    }
18};