Get all tagged TFS work items since last live release

GetTfsItems.js

//This script makes some assumptions
//1. You tag the work items in your commits  e.g. #1234 - Fixed bug
//2. That all 'live' environments will have the same name

//https://docs.microsoft.com/en-us/rest/api/azure/devops/?view=azure-devops-rest-6.1#api-and-tfs-version-mapping
const apiVersion = "4.1-preview"
const serverUrl = "http://serverurlhere:8080" //
const projectList = ["Some_Frontend_Project","Some_Backend_Project"]; 
const liveEnvironmentName = "Live"

async function _TFSFetch(url){
    return await(await fetch(url, {
        method: 'GET',
        headers:{
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        credentials: 'include'
    })).json()
}

/**
 *
 * @param {number} from BuildId
 * @param {number} to BuildId
 */
async function getTFSWorkItems(projectName, from, to){    
    return await _TFSFetch(`${serverUrl}/tfs/Projects/${projectName}/_apis/build/workitems?fromBuildId=${from}&toBuildId=${to}&api-version=${apiVersion}`);
}

/**
 *
 * @param {number} from BuildId
 * @param {number} to BuildId
 */
async function getTFSReleases(projectName){
    return await _TFSFetch(`${serverUrl}/tfs/Projects/${projectName}/_apis/release/releases?api-version=${apiVersion}&$expand=environments,artifacts`);
}

/**
 * @param {Array<Object>} Params Any number of parameters, each being an array of work items from different projects
 * @returns {Array}
 */
async function parseWorkItems(){
    let itemsRes = [].concat(...arguments);
    let results = [];

    for(const item of itemsRes){
        let result = await (await fetch(item.url)).json();
        results.push({
            id: item.id,
            value: result.fields["System.Title"]
        })
    }

    return results;
}

let workItemsList = []

for(const project of projectList){
    var releases = (await getTFSReleases(project)).value;
    let lastRelease = releases[0].artifacts[0].definitionReference.version.id;
    let lastLiveRelease = releases.filter(release => release.environments.find(env => env.name === liveEnvironmentName).status === "succeeded")[0].artifacts[0].definitionReference.version.id
    let results = (await getTFSWorkItems(project,lastLiveRelease,lastRelease)).value
    workItemsList.push(results);
}

let results = await parseWorkItems(...workItemsList);
results = new Set(results.map(a => a.value))
console.log(results);