validateCronJobs.js

const cron = require('node-cron');
const each = require('lodash/each');

/**
 * Put all schedules in here so they get run through the validator
 * You may wonder why these have specific names... ideally
 * we don't ever want jobs to run together as thats
 * risking putting load on the app unnecessarily
 */
const schedules = {
  test: '* * * * * *',
  leave: '0 10,18 * * 1-5',
  timeEntered: '0 13 * * 1',
  debtor: '0 9 5 * *',
  creditor: '0 8 5 * *',
};

/**
 * IIFE to validate the jobs. If one of them is invalid it will
 * break and throw an error.
 */
((sched, c) => {
  each(sched, (s) => {
    if (!c.validate(s)) {
      const errorMessage = `Schedules contains invalid cron expression: ${s}`;
      throw new Error(errorMessage);
    }
  });
  return true;
})(schedules, cron);