create-better-t-stack/apps/cli/src/helpers/runtime-setup.ts

import path from "node:path";
import fs from "fs-extra";
import type { ProjectBackend, ProjectConfig } from "../types";
import { addPackageDependency } from "../utils/add-package-deps";

export async function setupRuntime(config: ProjectConfig): Promise<void> {
	const { projectName, runtime, backend, projectDir } = config;

	if (backend === "convex" || backend === "next" || runtime === "none") {
		return;
	}

	const serverDir = path.join(projectDir, "apps/server");

	if (!(await fs.pathExists(serverDir))) {
		return;
	}

	if (runtime === "bun") {
		await setupBunRuntime(serverDir, backend);
	} else if (runtime === "node") {
		await setupNodeRuntime(serverDir, backend);
	}
}

async function setupBunRuntime(
	serverDir: string,
	backend: ProjectBackend,
): Promise<void> {
	const packageJsonPath = path.join(serverDir, "package.json");
	if (!(await fs.pathExists(packageJsonPath))) return;

	const packageJson = await fs.readJson(packageJsonPath);

	packageJson.scripts = {
		...packageJson.scripts,
		dev: "bun run --hot src/index.ts",
		start: "bun run dist/src/index.js",
	};

	await fs.writeJson(packageJsonPath, packageJson, { spaces: 2 });

	await addPackageDependency({
		devDependencies: ["@types/bun"],
		projectDir: serverDir,
	});
}

async function setupNodeRuntime(
	serverDir: string,
	backend: ProjectBackend,
): Promise<void> {
	const packageJsonPath = path.join(serverDir, "package.json");
	if (!(await fs.pathExists(packageJsonPath))) return;

	const packageJson = await fs.readJson(packageJsonPath);

	packageJson.scripts = {
		...packageJson.scripts,
		dev: "tsx watch src/index.ts",
		start: "node dist/src/index.js",
	};

	await fs.writeJson(packageJsonPath, packageJson, { spaces: 2 });

	await addPackageDependency({
		devDependencies: ["tsx", "@types/node"],
		projectDir: serverDir,
	});

	if (backend === "hono") {
		await addPackageDependency({
			dependencies: ["@hono/node-server"],
			projectDir: serverDir,
		});
	} else if (backend === "elysia") {
		await addPackageDependency({
			dependencies: ["@elysiajs/node"],
			projectDir: serverDir,
		});
	}
}