Can be used to gain a reference to the associated line item names of a deal in HubSpot

getDealAssociatedLineItemNames.js

const hubspot = require('@hubspot/api-client');

exports.main = async (event, callback) => {

    let lineItemNames = [];

    const hubspotClient = new hubspot.Client({
        apiKey: process.env.HAPIKEY
    });

    hubspotClient.crm.deals.associationsApi.getAll(event.object.objectId, "line_item").then((results) => {

        let lineItemPromises = results.body.results.map(item => {
            return hubspotClient.crm.lineItems.basicApi.getById(item.id, ['name']).then(results => {
                return results.body
            })
        })

        Promise.all(lineItemPromises).then(resultsArray => {
            console.log(resultsArray);
            resultsArray.filter(item => {
                console.log(item.properties.name);
                lineItemNames.push(item.properties.name);
            });

            callback({
                outputFields: {
                    products: lineItemNames.join(",")
                }
            })

        })

    }).catch((err) => {
        console.error(err);
    })
}