galaxy-game/ui/frontend/src/lib/paths.ts

// Base-path helpers for the single-origin deployment. The game UI is
// served under `kit.paths.base` — empty at the root for local dev,
// vitest, and Playwright, and `/game` in the deployed single-origin
// build. SvelteKit does not auto-prefix `goto`, `<a href>`, raw asset
// fetches, or the service-worker scope, so every app-internal absolute
// path is routed through `withBase`.
//
// `base` from `$app/paths` is the low-level primitive that `resolve()`
// builds on. We use it directly here (rather than `resolve()`) because
// the client navigates to and fetches dynamic, runtime-built paths
// (command routes, `core.wasm`, the service worker) that `resolve()`'s
// statically-typed route-id surface cannot express.
import { base } from "$app/paths";

/** appBase is the configured base path (empty string at the root). */
export const appBase = base;

/**
 * withBase prefixes an app-internal absolute path (leading slash) with
 * the configured base path. At the root it returns the path unchanged;
 * under the single-origin deployment it yields e.g. `/game/lobby`.
 */
export function withBase(path: string): string {
	return `${base}${path}`;
}