update.js

import handler from './libs/handler-lib';
import dynamoDb from './libs/dynamodb-lib';

export const main = handler(async (event, context) => {
	const data = JSON.parse(event.body);
	const params = {
		TableName: process.env.tableName,
		Key: {
			userId: event.requestContext.identity.cognitoIdentityId,
			noteId: event.pathParameters.id,
		},
		UpdateExpression: 'SET content = :content, attachment = :attachment',
		ExpressionAttributeValues: {
			':attachment': data.attachment || null,
			':content': data.content || null,
		},
		ReturnValues: 'ALL_NEW',
	};

	await dynamoDb.update(params);

	return { status: true };
});