node-event-bot/server/helper/typeFind.ts

import { CustomError, errorCodes } from "../interfaces";
import { scheduleNames, supportedSchedule } from "../types/scheduledEventTypes";

export function findInScheduleTypes(inputString: string): supportedSchedule {
	const maybeScheduleName: unknown = JSON.parse(`"${inputString.toLowerCase()}"`);
	const scheduleName = scheduleNames.find((validName: supportedSchedule) => validName === maybeScheduleName);
	if (scheduleName) {
		// `sheepName` comes from the list of `sheepNames` so the compiler is happy.
		return scheduleName;
	}
	throw new CustomError('That is not a schedule name.', errorCodes.schedule_not_supported);
}