import { readFileSync } from "node:fs";import { describe, expect, it } from "@effect/vitest"; import {  buildDocsUpstream,  buildPosthogUpstream,  isDocsPath,  isPosthogPath,  passthroughResponse,  POSTHOG_PROXY_PATH,} from "./passthrough"; describe("passthrough matching", () => {  it("claims /docs and everything under it, but not /api/docs", () => {    expect(isDocsPath("/docs")).toBe(true);    expect(isDocsPath("/docs/concepts/policies")).toBe(true);    // The app-owned Swagger route must keep reaching the Effect app.    expect(isDocsPath("/api/docs")).toBe(false);    expect(isDocsPath("/docsearch")).toBe(false);  });   it("claims the PostHog proxy path and its subtree only", () => {    expect(isPosthogPath(POSTHOG_PROXY_PATH)).toBe(true);    expect(isPosthogPath(`${POSTHOG_PROXY_PATH}/i/v0/e/`)).toBe(true);    expect(isPosthogPath(`${POSTHOG_PROXY_PATH}extra`)).toBe(false);    expect(isPosthogPath("/api/connections")).toBe(false);  });   it("returns null for app paths so they fall through to normal dispatch", () => {    expect(passthroughResponse(new Request("https://executor.sh/"), "/")).toBeNull();    expect(      passthroughResponse(new Request("https://executor.sh/api/connections"), "/api/connections"),    ).toBeNull();    expect(passthroughResponse(new Request("https://executor.sh/mcp"), "/mcp")).toBeNull();  });}); describe("upstream construction", () => {  it("forwards the docs path unchanged and strips the session cookie", () => {    const upstream = buildDocsUpstream(      new Request("https://executor.sh/docs/concepts/policies?x=1", {        headers: { cookie: "wos-session=secret" },      }),    );    const url = new URL(upstream.url);    expect(url.hostname).toBe("executor.mintlify.dev");    expect(url.pathname).toBe("/docs/concepts/policies");    expect(url.search).toBe("?x=1");    expect(upstream.headers.get("X-Forwarded-Host")).toBe("executor.sh");    expect(upstream.headers.get("cookie")).toBeNull();  });   it("strips the proxy prefix for PostHog and splits ingest from assets", () => {    const ingest = buildPosthogUpstream(      new Request(`https://executor.sh${POSTHOG_PROXY_PATH}/i/v0/e/`),      `${POSTHOG_PROXY_PATH}/i/v0/e/`,    );    expect(new URL(ingest.url).hostname).toBe("us.i.posthog.com");    expect(new URL(ingest.url).pathname).toBe("/i/v0/e/");     const assets = buildPosthogUpstream(      new Request(`https://executor.sh${POSTHOG_PROXY_PATH}/static/array.js`),      `${POSTHOG_PROXY_PATH}/static/array.js`,    );    expect(new URL(assets.url).hostname).toBe("us-assets.i.posthog.com");    expect(new URL(assets.url).pathname).toBe("/static/array.js");  });}); describe("Start-graph independence", () => {  // The entire point of this module is that server.ts can answer a proxy  // request WITHOUT importing TanStack Start. An import of the app or of  // `@tanstack/react-start` here silently reintroduces the ~3.1s cold-isolate  // `loadEntries` cost this module exists to avoid, and nothing else would  // catch it — the behavior stays correct, only slow.  it("imports neither TanStack Start nor an app module", () => {    const source = readFileSync(new URL("./passthrough.ts", import.meta.url), "utf8");    const imports = [...source.matchAll(/^\s*import[^"']*["']([^"']+)["']/gm)].map((m) => m[1]);    expect(imports.length).toBeGreaterThan(0);    for (const specifier of imports) {      expect(specifier).not.toMatch(/@tanstack/);      expect(specifier).not.toMatch(/^\.\.\//);    }  });});