@formatjs/ecma402-abstract/GetOption.js

A collection of implementation for ECMAScript abstract operations

import { ToString } from "./262.js";
/**
* https://tc39.es/ecma402/#sec-getoption
* @param opts
* @param prop
* @param type
* @param values
* @param fallback
*/
export function GetOption(opts, prop, type, values, fallback) {
	if (typeof opts !== "object") {
		throw new TypeError("Options must be an object");
	}
	let value = opts[prop];
	if (value !== undefined) {
		if (type !== "boolean" && type !== "string") {
			throw new TypeError("invalid type");
		}
		if (type === "boolean") {
			value = Boolean(value);
		}
		if (type === "string") {
			value = ToString(value);
		}
		if (values !== undefined && !values.filter((val) => val == value).length) {
			throw new RangeError(`${value} is not within ${values.join(", ")}`);
		}
		return value;
	}
	return fallback;
}