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

import { cancel, isCancel, select } from "@clack/prompts";
import pc from "picocolors";
import { DEFAULT_CONFIG } from "../constants";
import type { ProjectBackend, ProjectRuntime } from "../types";

export async function getRuntimeChoice(
	runtime?: ProjectRuntime,
	backend?: ProjectBackend,
): Promise<ProjectRuntime> {
	if (backend === "convex" || backend === "none") {
		return "none";
	}

	if (runtime !== undefined) return runtime;

	if (backend === "next") {
		return "node";
	}

	const response = await select<ProjectRuntime>({
		message: "Select runtime",
		options: [
			{
				value: "bun",
				label: "Bun",
				hint: "Fast all-in-one JavaScript runtime",
			},
			{
				value: "node",
				label: "Node.js",
				hint: "Traditional Node.js runtime",
			},
		],
		initialValue: DEFAULT_CONFIG.runtime,
	});

	if (isCancel(response)) {
		cancel(pc.red("Operation cancelled"));
		process.exit(0);
	}

	return response;
}