import moment from 'moment'; const allUnits = [ { name: 'years', suffix: 'year', inMoment: true, pluralizable: true }, { name: 'months', suffix: 'month', inMoment: true, pluralizable: true }, { name: 'days', suffix: 'day', inMoment: true, pluralizable: true }, { name: 'hours', suffix: 'h', longSuffix: 'hour', inMoment: true, pluralizable: false }, { name: 'minutes', suffix: 'm', longSuffix: 'minute', inMoment: true, pluralizable: false }, { name: 'seconds', suffix: 's', longSuffix: 'second', inMoment: true, pluralizable: false }, { name: 'milliseconds', suffix: 'ms', inMoment: true, pluralizable: false }, { name: 'microseconds', suffix: 'µs', inMoment: false, pluralizable: false }, { name: 'nanoseconds', suffix: 'ns', inMoment: false, pluralizable: false }, ]; const pluralizeUnits = (amount, unit, longForm) => { let suffix; if (longForm && unit.longSuffix) { suffix = amount === 1 ? unit.longSuffix : unit.longSuffix.pluralize(); } else { suffix = amount === 1 || !unit.pluralizable ? unit.suffix : unit.suffix.pluralize(); } const addSpace = unit.pluralizable || (longForm && unit.longSuffix); return `${amount}${addSpace ? ' ' : ''}${suffix}`; }; export default function formatDuration(duration = 0, units = 'ns', longForm = false) { const durationParts = {}; // Moment only handles up to millisecond precision. // Microseconds and nanoseconds need to be handled first, // then Moment can take over for all larger units. if (units === 'ns') { durationParts.nanoseconds = duration % 1000; durationParts.microseconds = Math.floor((duration % 1000000) / 1000); duration = Math.floor(duration / 1000000); } else if (units === 'mms') { durationParts.microseconds = duration % 1000; duration = Math.floor(duration / 1000); } let momentUnits = units; if (units === 'ns' || units === 'mms') { momentUnits = 'ms'; } const momentDuration = moment.duration(duration, momentUnits); // Get the count of each time unit that Moment handles allUnits .filterBy('inMoment') .mapBy('name') .forEach(unit => { durationParts[unit] = momentDuration[unit](); }); // Format each time time bucket as a string // e.g., { years: 5, seconds: 30 } -> [ '5 years', '30s' ] const displayParts = allUnits.reduce((parts, unitType) => { if (durationParts[unitType.name]) { const count = durationParts[unitType.name]; parts.push(pluralizeUnits(count, unitType, longForm)); } return parts; }, []); if (displayParts.length) { return displayParts.join(' '); } // When the duration is 0, show 0 in terms of `units` return pluralizeUnits(0, allUnits.findBy('suffix', units), longForm); }