export { getBrowserTestFetch, type BrowserTestFetch } from "../test-support-fetch.js";

import { createRequire } from "node:module";

type FetchLike = ((input: string | URL, init?: RequestInit) => Promise<Response>) & {

mock?: unknown;

};

export type BrowserTestFetch = (input: string | URL, init?: RequestInit) => Promise<Response>;

function isUsableFetch(value: unknown): value is FetchLike {

return typeof value === "function" && !("mock" in (value as FetchLike));

}

export function getBrowserTestFetch(): BrowserTestFetch {

const require = createRequire(import.meta.url);

const vitest = (globalThis as { vi?: { doUnmock?: (id: string) => void } }).vi;

vitest?.doUnmock?.("undici");

try {

delete require.cache[require.resolve("undici")];

} catch {

// Best-effort cache bust for shared-thread test workers.

}

const { fetch } = require("undici") as typeof import("undici");

if (isUsableFetch(fetch)) {

return (input, init) => fetch(input, init);

}

if (isUsableFetch(globalThis.fetch)) {

return (input, init) => globalThis.fetch(input, init);

}

throw new TypeError("fetch is not a function");

}