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// Lightweight Node fetch mocking via Undici MockAgent (Node 18) // Falls back to no-op if Undici not available. type RemoveFn = () => void export function withMockFetch(routes: Array<{ method: string; url: RegExp | string; reply: (body?: any) => any }>): RemoveFn { try { // eslint-disable-next-line @typescript-eslint/no-var-requires const undici = require('undici') const agent = new undici.MockAgent() agent.disableNetConnect() const pool = agent.get('http://localhost') for (const r of routes) { const method = r.method.toUpperCase() const matcher = typeof r.url === 'string' ? new RegExp(r.url.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')) : r.url pool.intercept({ path: matcher, method }).reply(200, (_opts: any) => r.reply(_opts?.body)) } undici.setGlobalDispatcher(agent) return () => undici.setGlobalDispatcher(new undici.Agent()) } catch { // No undici; do nothing. return () => void 0 } }