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csharpierd
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# dependencies (bun install)
node_modules
# output
out
dist
*.tgz
# code coverage
coverage
*.lcov
# logs
logs
_.log
report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
# dotenv environment variable files
.env
.env.development.local
.env.test.local
.env.production.local
.env.local
# caches
.eslintcache
.cache
*.tsbuildinfo
# IntelliJ based IDEs
.idea
# Finder (MacOS) folder config
.DS_Store

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Default to using Bun instead of Node.js.
- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
- Use `bun test` instead of `jest` or `vitest`
- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild`
- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install`
- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>`
- Bun automatically loads .env, so don't use dotenv.
## APIs
- `Bun.serve()` supports WebSockets, HTTPS, and routes. Don't use `express`.
- `bun:sqlite` for SQLite. Don't use `better-sqlite3`.
- `Bun.redis` for Redis. Don't use `ioredis`.
- `Bun.sql` for Postgres. Don't use `pg` or `postgres.js`.
- `WebSocket` is built-in. Don't use `ws`.
- Prefer `Bun.file` over `node:fs`'s readFile/writeFile
- Bun.$`ls` instead of execa.
## Testing
Use `bun test` to run tests.
```ts#index.test.ts
import { test, expect } from "bun:test";
test("hello world", () => {
expect(1).toBe(1);
});
```
## Frontend
Use HTML imports with `Bun.serve()`. Don't use `vite`. HTML imports fully support React, CSS, Tailwind.
Server:
```ts#index.ts
import index from "./index.html"
Bun.serve({
routes: {
"/": index,
"/api/users/:id": {
GET: (req) => {
return new Response(JSON.stringify({ id: req.params.id }));
},
},
},
// optional websocket support
websocket: {
open: (ws) => {
ws.send("Hello, world!");
},
message: (ws, message) => {
ws.send(message);
},
close: (ws) => {
// handle close
}
},
development: {
hmr: true,
console: true,
}
})
```
HTML files can import .tsx, .jsx or .js files directly and Bun's bundler will transpile & bundle automatically. `<link>` tags can point to stylesheets and Bun's CSS bundler will bundle.
```html#index.html
<html>
<body>
<h1>Hello, world!</h1>
<script type="module" src="./frontend.tsx"></script>
</body>
</html>
```
With the following `frontend.tsx`:
```tsx#frontend.tsx
import React from "react";
// import .css files directly and it works
import './index.css';
import { createRoot } from "react-dom/client";
const root = createRoot(document.body);
export default function Frontend() {
return <h1>Hello, world!</h1>;
}
root.render(<Frontend />);
```
Then, run index.ts
```sh
bun --hot ./index.ts
```
For more information, read the Bun API docs in `node_modules/bun-types/docs/**.md`.

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# csharpierd
To install dependencies:
```bash
bun install
```
To run:
```bash
bun run index.ts
```
This project was created using `bun init` in bun v1.3.0. [Bun](https://bun.com) is a fast all-in-one JavaScript runtime.

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{
"lockfileVersion": 1,
"workspaces": {
"": {
"name": "csharpierd",
"devDependencies": {
"@types/bun": "latest",
},
"peerDependencies": {
"typescript": "^5",
},
},
},
"packages": {
"@types/bun": ["@types/bun@1.3.0", "", { "dependencies": { "bun-types": "1.3.0" } }, "sha512-+lAGCYjXjip2qY375xX/scJeVRmZ5cY0wyHYyCYxNcdEXrQ4AOe3gACgd4iQ8ksOslJtW4VNxBJ8llUwc3a6AA=="],
"@types/node": ["@types/node@24.9.1", "", { "dependencies": { "undici-types": "~7.16.0" } }, "sha512-QoiaXANRkSXK6p0Duvt56W208du4P9Uye9hWLWgGMDTEoKPhuenzNcC4vGUmrNkiOKTlIrBoyNQYNpSwfEZXSg=="],
"@types/react": ["@types/react@19.2.2", "", { "dependencies": { "csstype": "^3.0.2" } }, "sha512-6mDvHUFSjyT2B2yeNx2nUgMxh9LtOWvkhIU3uePn2I2oyNymUAX1NIsdgviM4CH+JSrp2D2hsMvJOkxY+0wNRA=="],
"bun-types": ["bun-types@1.3.0", "", { "dependencies": { "@types/node": "*" }, "peerDependencies": { "@types/react": "^19" } }, "sha512-u8X0thhx+yJ0KmkxuEo9HAtdfgCBaM/aI9K90VQcQioAmkVp3SG3FkwWGibUFz3WdXAdcsqOcbU40lK7tbHdkQ=="],
"csstype": ["csstype@3.1.3", "", {}, "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw=="],
"typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],
"undici-types": ["undici-types@7.16.0", "", {}, "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw=="],
}
}

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namespace CSharpier.Cli.Server;
public class FormatFileParameter
{
#pragma warning disable IDE1006
public required string fileContents { get; set; }
public required string fileName { get; set; }
#pragma warning restore IDE1006
}

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#!/usr/bin/env bun
const STATE_FILE = "/tmp/csharpierd-state.json";
const LOCK_FILE = "/tmp/csharpierd.lock";
const SERVER_PORT = 18912;
const IDLE_TIMEOUT_MS = 60 * 60 * 1000; // 1 hour
interface ServerState {
pid: number;
port: number;
lastAccess: number;
}
// Acquire lock to prevent race conditions
async function acquireLock(): Promise<boolean> {
try {
const lockFile = Bun.file(LOCK_FILE);
if (await lockFile.exists()) {
// Check if lock is stale (older than 10 seconds)
const stat = await Bun.file(LOCK_FILE).stat();
if (Date.now() - stat.mtime.getTime() > 10000) {
await Bun.$`rm -f ${LOCK_FILE}`;
} else {
return false;
}
}
await Bun.write(LOCK_FILE, String(process.pid));
return true;
} catch {
return false;
}
}
async function releaseLock(): Promise<void> {
await Bun.$`rm -f ${LOCK_FILE}`.quiet();
}
// Load server state
async function loadState(): Promise<ServerState | null> {
try {
const file = Bun.file(STATE_FILE);
if (!(await file.exists())) return null;
return await file.json();
} catch {
return null;
}
}
// Save server state
async function saveState(state: ServerState): Promise<void> {
await Bun.write(STATE_FILE, JSON.stringify(state, null, 2));
}
// Check if process is running
async function isProcessRunning(pid: number): Promise<boolean> {
try {
const result = await Bun.$`kill -0 ${pid}`.quiet();
return result.exitCode === 0;
} catch {
return false;
}
}
// Check if server is responsive
async function isServerResponsive(port: number): Promise<boolean> {
try {
const response = await fetch(`http://localhost:${port}/`, {
signal: AbortSignal.timeout(2000),
});
return response.ok || response.status === 404; // Server is up if it responds at all
} catch {
return false;
}
}
// Kill server process
async function killServer(pid: number): Promise<void> {
try {
await Bun.$`kill ${pid}`.quiet();
// Wait a bit and force kill if needed
await Bun.sleep(500);
if (await isProcessRunning(pid)) {
await Bun.$`kill -9 ${pid}`.quiet();
}
} catch {
// Ignore errors
}
}
// Start CSharpier server
async function startServer(): Promise<number> {
console.error("Starting CSharpier server...");
// Start server in background
const proc = Bun.spawn(
["dotnet", "csharpier", "server", "--server-port", String(SERVER_PORT)],
{
stdout: "inherit",
stderr: "inherit",
},
);
const pid = proc.pid;
proc.unref(); // Allow parent to exit without waiting
// Wait for server to be ready (max 10 seconds)
for (let i = 0; i < 50; i++) {
await Bun.sleep(200);
if (await isServerResponsive(SERVER_PORT)) {
console.error(`CSharpier server started with PID ${pid}`);
return pid;
}
}
throw new Error("Server failed to start within timeout");
}
// Cleanup idle servers
async function cleanupIdleServer(state: ServerState): Promise<void> {
const idleTime = Date.now() - state.lastAccess;
if (idleTime > IDLE_TIMEOUT_MS) {
console.error(
`Server idle for ${Math.floor(idleTime / 1000)}s, shutting down...`,
);
await killServer(state.pid);
await Bun.$`rm -f ${STATE_FILE}`.quiet();
}
}
// Ensure server is running
async function ensureServer(): Promise<ServerState> {
// Try to acquire lock with retries
for (let i = 0; i < 5; i++) {
if (await acquireLock()) break;
await Bun.sleep(100);
}
try {
let state = await loadState();
// Check if we have a running server
if (state) {
// Check idle timeout
await cleanupIdleServer(state);
// Verify server is still running and responsive
if (
(await isProcessRunning(state.pid)) &&
(await isServerResponsive(state.port))
) {
return state;
} else {
console.error(
"Server process not found or not responsive, restarting...",
);
if (await isProcessRunning(state.pid)) {
await killServer(state.pid);
}
}
}
// Start new server
const pid = await startServer();
state = {
pid,
port: SERVER_PORT,
lastAccess: Date.now(),
};
await saveState(state);
return state;
} finally {
await releaseLock();
}
}
interface FormatResult {
formattedFile?: string;
errorMessage?: string;
status: "Formatted" | "Ignored" | "Failed" | "UnsupportedFile";
}
// Format code
async function formatCode(
fileName: string,
fileContents: string,
): Promise<string> {
const state = await ensureServer();
try {
const response = await fetch(`http://localhost:${state.port}/format`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({
fileName: `/tmp/${fileName}`,
fileContents,
}),
});
if (!response.ok) {
throw new Error(
`Server returned ${response.status}: ${await response.text()}`,
);
}
const result = (await response.json()) as FormatResult;
// Update last access time
state.lastAccess = Date.now();
await saveState(state);
if (!result.formattedFile) {
throw new Error(result.errorMessage);
}
return result.formattedFile;
} catch (error) {
console.error("Error formatting code:", error);
throw error;
}
}
// Main
async function main() {
const fileName = process.argv[2];
if (!fileName) {
console.error("Usage: bun index.ts <filename> < input.cs");
process.exit(1);
}
// Read stdin
const reader = process.stdin;
const chunks: Buffer[] = [];
for await (const chunk of reader) {
chunks.push(chunk);
}
const fileContents = Buffer.concat(chunks).toString("utf-8");
if (!fileContents) {
console.error("Error: No input provided via stdin");
process.exit(1);
}
// Format and output
const formatted = await formatCode(fileName, fileContents);
process.stdout.write(formatted);
}
main().catch((error) => {
console.error("Fatal error:", error);
process.exit(1);
});

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{
"name": "csharpierd",
"module": "index.ts",
"type": "module",
"private": true,
"devDependencies": {
"@types/bun": "latest"
},
"peerDependencies": {
"typescript": "^5"
}
}

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{
"compilerOptions": {
// Environment setup & latest features
"lib": ["ESNext"],
"target": "ESNext",
"module": "Preserve",
"moduleDetection": "force",
"jsx": "react-jsx",
"allowJs": true,
// Bundler mode
"moduleResolution": "bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"noEmit": true,
// Best practices
"strict": true,
"skipLibCheck": true,
"noFallthroughCasesInSwitch": true,
"noUncheckedIndexedAccess": true,
"noImplicitOverride": true,
// Some stricter flags (disabled by default)
"noUnusedLocals": false,
"noUnusedParameters": false,
"noPropertyAccessFromIndexSignature": false
}
}