CircleCI Server: Process list of jobs and users, and extract a list of unseen users

procJobs.js

// Modules to use
const fs = require('fs');

{
    // Output: Array of users unseen in the job list
    const unseenUsers = [];
    // Output: Tab-separated list of jobs
    const jobsTSV = [];

    // Source data
    const jobs = JSON.parse(fs.readFileSync('jobs.json'));
    const users = JSON.parse(fs.readFileSync('users.json'));

    // Internal data: a "user -> last job trigger date" map
    const lastJobByUser = new Map();

    // Iterate through the list of jobs
    jobs.forEach((job) => {
        // Put the job into the TSV
        jobsTSV.push([job.at, job.by, job.for].join('\t'));

        // Update "user -> last job trigger date" map
        lastJobByUser.set(job.by, job.at);
    });

    // Iterate through the list of users
    users.forEach((user) => {
        if (lastJobByUser.get(user) === void 0) {
            // The user did not trigger a job for a while
            // Add the user to unseenUsers
            unseenUsers.push(user);
        }
    });

    // Dump output to files
    // Files are created in the current directory
    fs.writeFileSync('jobs.tsv', jobsTSV.reverse().join('\n'));     // jobs.tsv: List of all jobs, ordered by job date in descending order (newest comes first)
    fs.writeFileSync('allUsers.txt', users.join('\n'));             // allUsers.txt: List of all users registered in CircleCI
    fs.writeFileSync('unseenUsers.txt', unseenUsers.join('\n'));    // unseenUsers.txt: List of unseen users
}