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// Static file server for the built frontend (packages/frontend/dist).
// Uses Bun's built-in HTTP server — no extra runtime dependencies.
//
// Environment variables:
// PORT — port to listen on (default: 18391)
// HOST — interface to bind to (default: 0.0.0.0)
// DIST_DIR — absolute path to the static assets directory
// (default: <this-file's-dir>/dist)
//
// SPA fallback: requests that don't match a file on disk fall back to
// index.html so client-side routing works.
import { existsSync, statSync } from "node:fs";
import { join, normalize, resolve } from "node:path";
import { fileURLToPath } from "node:url";
const moduleDir = (() => {
try {
// @ts-expect-error — Bun provides import.meta.dir
return import.meta.dir as string;
} catch {
return resolve(fileURLToPath(import.meta.url), "..");
}
})();
const port = Number(process.env.PORT) || 18391;
const host = process.env.HOST || "0.0.0.0";
const distDir = resolve(process.env.DIST_DIR || join(moduleDir, "dist"));
if (!existsSync(distDir) || !statSync(distDir).isDirectory()) {
console.error(`[dispatch-frontend] dist directory not found: ${distDir}`);
console.error(
"[dispatch-frontend] Build the frontend first (bun run --cwd packages/frontend build)",
);
process.exit(1);
}
const indexPath = join(distDir, "index.html");
function safeResolve(urlPath: string): string | null {
// Normalize and prevent path-traversal outside distDir.
const decoded = decodeURIComponent(urlPath);
const candidate = resolve(distDir, `.${normalize(decoded)}`);
if (!candidate.startsWith(distDir)) return null;
return candidate;
}
Bun.serve({
port,
hostname: host,
async fetch(req) {
const url = new URL(req.url);
let pathname = url.pathname;
if (pathname === "/" || pathname === "") pathname = "/index.html";
const resolved = safeResolve(pathname);
if (resolved && existsSync(resolved) && statSync(resolved).isFile()) {
return new Response(Bun.file(resolved));
}
// SPA fallback — serve index.html for unknown routes
return new Response(Bun.file(indexPath), {
headers: { "content-type": "text/html; charset=utf-8" },
});
},
});
console.log(`[dispatch-frontend] serving ${distDir} on http://${host}:${port}`);
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