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

Formats JavaScript dates to relative time strings.

import { invariant, SameValue, ToString, Type } from "@formatjs/ecma402-abstract";
import { SingularRelativeTimeUnit } from "./SingularRelativeTimeUnit.js";
import { MakePartsList } from "./MakePartsList.js";
export function PartitionRelativeTimePattern(rtf, value, unit, { getInternalSlots }) {
	invariant(Type(value) === "Number", `value must be number, instead got ${typeof value}`, TypeError);
	invariant(Type(unit) === "String", `unit must be number, instead got ${typeof value}`, TypeError);
	if (isNaN(value) || !isFinite(value)) {
		throw new RangeError(`Invalid value ${value}`);
	}
	const resolvedUnit = SingularRelativeTimeUnit(unit);
	const { fields, style, numeric, pluralRules, numberFormat } = getInternalSlots(rtf);
	let entry = resolvedUnit;
	if (style === "short") {
		entry = `${resolvedUnit}-short`;
	} else if (style === "narrow") {
		entry = `${resolvedUnit}-narrow`;
	}
	if (!(entry in fields)) {
		entry = resolvedUnit;
	}
	const patterns = fields[entry];
	if (numeric === "auto") {
		if (ToString(value) in patterns) {
			return [{
				type: "literal",
				value: patterns[ToString(value)]
			}];
		}
	}
	let tl = "future";
	if (SameValue(value, -0) || value < 0) {
		tl = "past";
	}
	const po = patterns[tl];
	const fv = typeof numberFormat.formatToParts === "function" ? numberFormat.formatToParts(Math.abs(value)) : [{
		type: "literal",
		value: numberFormat.format(Math.abs(value)),
		unit
	}];
	const pr = pluralRules.select(value);
	const pattern = po[pr];
	return MakePartsList(pattern, resolvedUnit, fv);
}