Correct details surrounding Intl.supportedValuesOf, improve comments/solve TODO

src/env/schema.mjs

@@ -1,8 +1,9 @@
 // @ts-check
 import { z } from 'zod';
 
-// @ts-ignore
+// If this line fails, you're not running Node v18 or higher. Please upgrade.
 const TimezoneSchema = z.enum(Intl.supportedValuesOf("timeZone"));
+
 /**
  * Specify your server-side environment variables schema here.
  * This way you can ensure the app isn't built with invalid env vars.

src/location.ts

@@ -56,7 +56,7 @@ export function distance(
 export async function getDistance(): Promise<number> {
 	let client;
 	try {
-		// Setup the Life360 API client
+		// Set up the Life360 API client
 		client = await life360.login(env.LIFE360_USERNAME, env.LIFE360_PASSWORD);
 	} catch (e) {
 		throw new Error(

src/utils/timezone.ts

@@ -2,8 +2,11 @@ import { utcToZonedTime } from 'date-fns-tz';
 import { z } from 'zod';
 import { env } from '@/env/server.mjs';
 
-// @ts-ignore TS2339 -- TODO: Figure out why Intl.supportedValuesOf isn't seen by Typescript
-export const TimezoneSchema = z.enum(Intl.supportedValuesOf('timeZone'));
+// If this line fails in Typescript, then install typescript@^5.1.3
+export const TimezoneSchema = z.enum(
+	// 'as' to assume at least one element
+	Intl.supportedValuesOf('timeZone') as [string, ...string[]]
+);
 export type Timezone = z.infer<typeof TimezoneSchema>;
 
 export function localNow(now?: Date, zone?: Timezone): Date {