pi-ext

/**
 * Memoize a dynamic import so concurrent callers share one evaluation.
 *
 * Pi loads extensions through jiti with the module cache disabled.
 * Two concurrent imports of the same module can then race: the second
 * caller receives a partially initialized module whose top-level awaits
 * have not finished and whose imported bindings are still `undefined`
 * (for example `Cannot read properties of undefined (reading
 * 'isCodexAvailable')` from parallel web searches).
 *
 * Routing every lazy import through one shared promise closes that window.
 * A rejected load clears the memo so the next call retries.
 */
export function lazy<T>(load: () => Promise<T>): () => Promise<T> {
	let promise: Promise<T> | undefined;
	return () =>
		(promise ??= load().catch((error: unknown) => {
			promise = undefined;
			throw error;
		}));
}