Repository: withastro/astro
File: packages/astro/src/vite-plugin-astro-server/plugin.ts (TypeScript)

Code before:

					if (!existsSync(cacheDir)) {
						await mkdir(cacheDir, { recursive: true });
					}

					let config = {
						version: 1,
						projectId: randomUUID(),
						workspaceRoot: fileURLToPath(settings.config.root),
					};
					if (existsSync(configPath)) {
						try {
							config = JSON.parse(await readFile(configPath, 'utf-8'));
						} catch {}
					}
					await writeFile(configPath, JSON.stringify(config, null, 2));

					response.setHeader('Content-Type', 'application/json');
					response.end(
						JSON.stringify({
							version: '1.0',
							projectId: config.projectId,
							workspaceRoot: config.workspaceRoot,
						}),
					);
					return;
				});

				// Note that this function has a name so other middleware can find it.
				viteServer.middlewares.use(async function astroDevHandler(request, response) {
					if (request.url === undefined || !request.method) {
						response.writeHead(500, 'Incomplete request');
						response.end();
						return;
					}
					localStorage.run(request, () => {
						handleRequest({
							pipeline,
							routesList,
							controller,
							incomingRequest: request,
							incomingResponse: response,
						});
					});
				});
			};
		},
		transform(code, id, opts = {}) {
			if (opts.ssr) return;
			if (!id.includes('vite/dist/client/client.mjs')) return;


Review comment (bug):
This code seems a bit funny? Why is there `config` with a `version` property different from the expected format returned in the response? Which then is never used again?

Can’t we `response.end(JSON.stringify(config))` instead of redefining the object?

And `existsSync()` followed by `readFile()` is usually considered an anti-pattern, because reading the file will already reveal if it exists or not.

I’d guess we could avoid unnecessary writes by only writing when `readFile()` errors:

```suggestion
					const cacheDir = fileURLToPath(settings.config.cacheDir);
					const configPath = join(cacheDir, 'chrome-workspace.json');

					if (!existsSync(cacheDir)) {
						await mkdir(cacheDir, { recursive: true });
					}

					let config = {
						version: '1.0',
						projectId: randomUUID(),
						workspaceRoot: fileURLToPath(settings.config.root),
					};
					try {
						config = JSON.parse(await readFile(configPath, 'utf-8'));
					} catch {
						await writeFile(configPath, JSON.stringify(config, null, 2));
					}

					response.setHeader('Content-Type', 'application/json');
					response.end(JSON.stringify(config));
					return;
```

Maybe there are assumptions I’m wrong about, but then we probably need some comments here explaining why it’s being done like this.

Code after:
					if (!existsSync(cacheDir)) {
						await mkdir(cacheDir, { recursive: true });
					}

					let config;
					try {
						config = JSON.parse(await readFile(configPath, 'utf-8'));
					} catch {
						config = {
							version: '1.0',
							projectId: randomUUID(),
							workspaceRoot: fileURLToPath(settings.config.root),
						};
						await writeFile(configPath, JSON.stringify(config));
					}

					response.setHeader('Content-Type', 'application/json');
					response.end(JSON.stringify(config));
					return;
				});

				// Note that this function has a name so other middleware can find it.
				viteServer.middlewares.use(async function astroDevHandler(request, response) {
					if (request.url === undefined || !request.method) {
						response.writeHead(500, 'Incomplete request');
						response.end();
						return;
					}
					localStorage.run(request, () => {
						handleRequest({
							pipeline,
							routesList,
							controller,
							incomingRequest: request,
							incomingResponse: response,
						});
					});
				});
			};
		},
		transform(code, id, opts = {}) {
			if (opts.ssr) return;
			if (!id.includes('vite/dist/client/client.mjs')) return;

			// Replace the Vite overlay with ours
			return patchOverlay(code);
		},
	};
}

/**