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import { updateCheck } from "./update_check.ts";import { DAY, dirname, fromFileUrl, join, toFileUrl } from "./deps.ts";import { FreshConfig, Manifest as ServerManifest } from "../server/mod.ts";import { build } from "./build.ts";import { collect, ensureMinDenoVersion, generate, Manifest } from "./mod.ts";import { startServer } from "../server/boot.ts";import { getInternalFreshState } from "../server/config.ts";import { getServerContext } from "../server/context.ts";
export async function dev(  base: string,  entrypoint: string,  config?: FreshConfig,) {  ensureMinDenoVersion();
  // Run update check in background  updateCheck(DAY).catch(() => {});
  const dir = dirname(fromFileUrl(base));
  let currentManifest: Manifest;  const prevManifest = Deno.env.get("FRSH_DEV_PREVIOUS_MANIFEST");  if (prevManifest) {    currentManifest = JSON.parse(prevManifest);  } else {    currentManifest = { islands: [], routes: [] };  }  const newManifest = await collect(dir, config?.router?.ignoreFilePattern);  Deno.env.set("FRSH_DEV_PREVIOUS_MANIFEST", JSON.stringify(newManifest));
  const manifestChanged =    !arraysEqual(newManifest.routes, currentManifest.routes) ||    !arraysEqual(newManifest.islands, currentManifest.islands);
  if (manifestChanged) await generate(dir, newManifest);
  const manifest = (await import(toFileUrl(join(dir, "fresh.gen.ts")).href))    .default as ServerManifest;
  if (Deno.args.includes("build")) {    const state = await getInternalFreshState(      manifest,      config ?? {},    );    state.config.dev = false;    state.loadSnapshot = false;    state.build = true;    await build(state);  } else if (config) {    const state = await getInternalFreshState(      manifest,      config,    );    state.config.dev = true;    state.loadSnapshot = false;    const ctx = await getServerContext(state);    await startServer(ctx.handler(), {      ...state.config.server,      basePath: state.config.basePath,    });  } else {    // Legacy entry point: Back then `dev.ts` would call `main.ts` but    // this causes duplicate plugin instantiation if both `dev.ts` and    // `main.ts` instantiate plugins.    Deno.env.set("__FRSH_LEGACY_DEV", "true");    entrypoint = new URL(entrypoint, base).href;    await import(entrypoint);  }}
function arraysEqual<T>(a: T[], b: T[]): boolean {  if (a.length !== b.length) return false;  for (let i = 0; i < a.length; ++i) {    if (a[i] !== b[i]) return false;  }  return true;}