JavaScript

import uuid from 'uuid/v4'

export default function getTestIDs() {
  if (process.env.NODE_ENV !== 'test') return {}

  let ids = new Map()
  let proxy = new Proxy({}, {
    get: function(obj, prop) {
      if (ids.has(prop) === false) {
        ids.set(prop, uuid())
      }
      return ids.get(prop)
    }
  })
  return proxy
}
const formatDuration = ms => {
  if (ms < 0) ms = -ms;
  const time = {
    day: Math.floor(ms / 86400000),
    hour: Math.floor(ms / 3600000) % 24,
    minute: Math.floor(ms / 60000) % 60,
    second: Math.floor(ms / 1000) % 60,
    millisecond: Math.floor(ms) % 1000
  };
  return Object.entries(time)
    .filter(val => val[1] !== 0)
    .map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`)
    .join(', ');
};

// Examples
formatDuration(1001); // '1 second, 1 millisecond'
formatDuration(34325055574); // '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'

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