/**
 * Normalize a path to the canonical registry key used by both fixture.ts (browser)
 * and plugin.ts (Node/Vite load hook).
 *
 * The browser's `new URL(path, import.meta.url).pathname` on a `/@fs/…` base URL
 * produces the absolute FS path (e.g. `/Users/…/src/calculator.js`).
 * The Vite load hook receives the resolved absolute FS path (e.g. `/Users/…/src/calculator.ts`).
 * Both sides normalize .ts/.tsx → .js so they always agree.
 *
 * Note, this function has to be separated from the `./plugin.ts` file since we cannot
 * load `./plugin.ts` in the browser.
 */
export declare function toRegistryKey(filePath: string): string;