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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | 18x 18x 18x 18x 18x 18x 18x 18x 18x 24x 24x 24x 24x 24x 24x 24x 24x 18x 18x 18x 144x | // Durations defined by ISO 31-1
const MILLISECONDS_IN_A_SECOND = 1000;
const MILLISECONDS_IN_A_MINUTE = MILLISECONDS_IN_A_SECOND * 60;
const MILLISECONDS_IN_AN_HOUR = MILLISECONDS_IN_A_MINUTE * 60;
const MILLISECONDS_IN_A_DAY = MILLISECONDS_IN_AN_HOUR * 24;
// Durations defined by common sense
const MILLISECONDS_IN_A_WEEK = MILLISECONDS_IN_A_DAY * 7;
const MILLISECONDS_IN_A_YEAR = MILLISECONDS_IN_A_DAY * 365;
const MILLISECONDS_IN_A_MONTH = MILLISECONDS_IN_A_YEAR / 12;
export const ZERO = Object.freeze({
years: 0 as number,
months: 0 as number,
weeks: 0 as number,
days: 0 as number,
hours: 0 as number,
minutes: 0 as number,
seconds: 0 as number,
milliseconds: 0 as number,
});
export type UnitKey = keyof typeof ZERO;
export const UNITS_META_MAP_LITERAL = {
years: {
milliseconds: MILLISECONDS_IN_A_YEAR,
months: 12,
dateGetter: (date: Date) => date.getFullYear(),
ISOCharacter: 'Y',
ISOPrecision: 'period',
},
months: {
milliseconds: MILLISECONDS_IN_A_MONTH,
months: 1,
dateGetter: (date: Date) => date.getMonth(),
ISOCharacter: 'M',
ISOPrecision: 'period',
},
weeks: {
milliseconds: MILLISECONDS_IN_A_WEEK,
dateGetter: () => 0,
ISOCharacter: 'W',
ISOPrecision: 'period',
stringifyConvertTo: 'days',
},
days: {
milliseconds: MILLISECONDS_IN_A_DAY,
dateGetter: (date: Date) => date.getDate(),
ISOCharacter: 'D',
ISOPrecision: 'period',
},
hours: {
milliseconds: MILLISECONDS_IN_AN_HOUR,
dateGetter: (date: Date) => date.getHours(),
ISOCharacter: 'H',
ISOPrecision: 'time',
},
minutes: {
milliseconds: MILLISECONDS_IN_A_MINUTE,
dateGetter: (date: Date) => date.getMinutes(),
ISOCharacter: 'M',
ISOPrecision: 'time',
},
seconds: {
milliseconds: MILLISECONDS_IN_A_SECOND,
dateGetter: (date: Date) => date.getSeconds(),
ISOCharacter: 'S',
ISOPrecision: 'time',
},
milliseconds: {
milliseconds: 1,
dateGetter: (date: Date) => date.getMilliseconds(),
stringifyConvertTo: 'seconds',
},
} as const;
interface Unit {
milliseconds: number;
months?: number;
dateGetter(date: Date): number;
ISOCharacter?: string;
ISOPrecision?: 'period' | 'time';
stringifyConvertTo?: UnitKey;
}
// Re-export with a defined signature to allow for destructuring of optional
// properties.
//
// The original `UNITS_MAP_LITERAL` is useful as TypeScript does not need a null
// check when accessing an optional property that it knows is defined for the
// specified unit (e.g. `UNITS_MAP_LITERAL.years.months`), whereas `UNITS_MAP`
// needs the null check.
export const UNITS_META_MAP: { [key in UnitKey]: Unit } = UNITS_META_MAP_LITERAL;
/**
* All the keys of the `Duration` type, ordered from largest
* to smallest.
*/
export const UNITS = Object.freeze([
'years',
'months',
'weeks',
'days',
'hours',
'minutes',
'seconds',
'milliseconds',
] as const);
export const UNITS_META = Object.freeze(
UNITS.map(unit => ({
...UNITS_META_MAP[unit],
unit,
})),
);
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