@the-teacher/the-router/build.mjs

Simple router for Express.js, making routes and actions easy to manage.

import esbuild from "esbuild";
import { execSync } from "child_process";

// Check if watch flag is present in command line arguments
const isWatch = process.argv.includes("--watch");

/** @type {import('esbuild').BuildOptions} */
const config = {
  entryPoints: ["src.ts/index.ts"],
  bundle: true,
  outdir: "src",
  platform: "node",
  target: "node18",
  format: "esm", // Using ESM format
  sourcemap: true,
  external: ["express", "express/*"], // Exclude express and all its subpaths
  banner: {
    js: `
      import { createRequire } from 'module';
      const require = createRequire(import.meta.url);
    `
  }
};

async function build() {
  // Run esbuild
  if (isWatch) {
    // Start watch mode for development
    const ctx = await esbuild.context(config);
    await ctx.watch();
    console.log("Watching for changes...");

    // Run TypeScript declaration generation in watch mode
    execSync("tsc --declaration --emitDeclarationOnly --outDir src --watch", {
      stdio: "inherit"
    });
  } else {
    // Run single build
    await esbuild.build(config);

    // Generate TypeScript declaration files
    execSync("tsc --declaration --emitDeclarationOnly --outDir src", {
      stdio: "inherit"
    });

    console.log("Build complete");
  }
}

build().catch((err) => {
  console.error(err);
  process.exit(1);
});