@formatjs/intl-relativetimeformat/abstract/SingularRelativeTimeUnit.js

Formats JavaScript dates to relative time strings.

import { invariant, Type } from "@formatjs/ecma402-abstract";
/**
* https://tc39.es/proposal-intl-relative-time/#sec-singularrelativetimeunit
* @param unit
*/
export function SingularRelativeTimeUnit(unit) {
	invariant(Type(unit) === "String", "unit must be a string");
	if (unit === "seconds") return "second";
	if (unit === "minutes") return "minute";
	if (unit === "hours") return "hour";
	if (unit === "days") return "day";
	if (unit === "weeks") return "week";
	if (unit === "months") return "month";
	if (unit === "quarters") return "quarter";
	if (unit === "years") return "year";
	if (unit !== "second" && unit !== "minute" && unit !== "hour" && unit !== "day" && unit !== "week" && unit !== "month" && unit !== "quarter" && unit !== "year") {
		throw new RangeError("invalid unit");
	}
	return unit;
}