@formatjs/intl-relativetimeformat/index.js

Formats JavaScript dates to relative time strings.

import { CanonicalizeLocaleList, SupportedLocales, ToString } from "@formatjs/ecma402-abstract";
import { InitializeRelativeTimeFormat } from "./abstract/InitializeRelativeTimeFormat.js";
import { PartitionRelativeTimePattern } from "./abstract/PartitionRelativeTimePattern.js";
import getInternalSlots from "./get_internal_slots.js";
export default class RelativeTimeFormat {
	constructor(locales, options) {
		// test262/test/intl402/RelativeTimeFormat/constructor/constructor/newtarget-undefined.js
		// Cannot use `new.target` bc of IE11 & TS transpiles it to something else
		const newTarget = this && this instanceof RelativeTimeFormat ? this.constructor : void 0;
		if (!newTarget) {
			throw new TypeError("Intl.RelativeTimeFormat must be called with 'new'");
		}
		return InitializeRelativeTimeFormat(this, locales, options, {
			getInternalSlots,
			availableLocales: RelativeTimeFormat.availableLocales,
			relevantExtensionKeys: RelativeTimeFormat.relevantExtensionKeys,
			localeData: RelativeTimeFormat.localeData,
			getDefaultLocale: RelativeTimeFormat.getDefaultLocale
		});
	}
	format(value, unit) {
		if (typeof this !== "object") {
			throw new TypeError("format was called on a non-object");
		}
		const internalSlots = getInternalSlots(this);
		if (!internalSlots.initializedRelativeTimeFormat) {
			throw new TypeError("format was called on a invalid context");
		}
		return PartitionRelativeTimePattern(this, Number(value), ToString(unit), { getInternalSlots }).map((el) => el.value).join("");
	}
	formatToParts(value, unit) {
		if (typeof this !== "object") {
			throw new TypeError("formatToParts was called on a non-object");
		}
		const internalSlots = getInternalSlots(this);
		if (!internalSlots.initializedRelativeTimeFormat) {
			throw new TypeError("formatToParts was called on a invalid context");
		}
		return PartitionRelativeTimePattern(this, Number(value), ToString(unit), { getInternalSlots });
	}
	resolvedOptions() {
		if (typeof this !== "object") {
			throw new TypeError("resolvedOptions was called on a non-object");
		}
		const internalSlots = getInternalSlots(this);
		if (!internalSlots.initializedRelativeTimeFormat) {
			throw new TypeError("resolvedOptions was called on a invalid context");
		}
		// test262/test/intl402/RelativeTimeFormat/prototype/resolvedOptions/type.js
		return {
			locale: internalSlots.locale,
			style: internalSlots.style,
			numeric: internalSlots.numeric,
			numberingSystem: internalSlots.numberingSystem
		};
	}
	static supportedLocalesOf(locales, options) {
		return SupportedLocales(RelativeTimeFormat.availableLocales, CanonicalizeLocaleList(locales), options);
	}
	static __addLocaleData(...data) {
		for (const { data: d, locale } of data) {
			const minimizedLocale = new Intl.Locale(locale).minimize().toString();
			RelativeTimeFormat.localeData[locale] = RelativeTimeFormat.localeData[minimizedLocale] = d;
			RelativeTimeFormat.availableLocales.add(minimizedLocale);
			RelativeTimeFormat.availableLocales.add(locale);
			if (!RelativeTimeFormat.__defaultLocale) {
				RelativeTimeFormat.__defaultLocale = minimizedLocale;
			}
		}
	}
	static localeData = {};
	static availableLocales = new Set();
	static __defaultLocale = "";
	static getDefaultLocale() {
		return RelativeTimeFormat.__defaultLocale;
	}
	static relevantExtensionKeys = ["nu"];
	static polyfilled = true;
}
try {
	// IE11 does not have Symbol
	if (typeof Symbol !== "undefined") {
		Object.defineProperty(RelativeTimeFormat.prototype, Symbol.toStringTag, {
			value: "Intl.RelativeTimeFormat",
			writable: false,
			enumerable: false,
			configurable: true
		});
	}
	// https://github.com/tc39/test262/blob/master/test/intl402/RelativeTimeFormat/constructor/length.js
	Object.defineProperty(RelativeTimeFormat.prototype.constructor, "length", {
		value: 0,
		writable: false,
		enumerable: false,
		configurable: true
	});
	// https://github.com/tc39/test262/blob/master/test/intl402/RelativeTimeFormat/constructor/supportedLocalesOf/length.js
	Object.defineProperty(RelativeTimeFormat.supportedLocalesOf, "length", {
		value: 1,
		writable: false,
		enumerable: false,
		configurable: true
	});
} catch {}