build from single entrypoint

esbuild.config.mjs

import * as esbuild from "esbuild";
import esbuildPluginTsc from "esbuild-plugin-tsc";
import path from "path";
import { stat } from "fs/promises";
import ora from "ora";

const main = process.argv.slice(2).find(e => e) ?? "src/main.ts";
const currentFileLocation = import.meta.url.substring("file://".length);

await esbuild.build({
  entryPoints: [
    main
  ],
  outdir: "dist/src",
  sourcemap: true,
  bundle: true,
  platform: "node",
  format: "cjs",
  plugins: [esbuildPluginTsc(), {
    name: "progress-tracking",
    setup(build) {
      let spinner = ora();
      let filesLoaded = 0;
      let compilationStart = 0;
      build.onStart(() => {
        spinner.text = "Started esbuild";
        spinner.start();
        compilationStart = performance.now();
      });
      build.onResolve({
        filter: /.*/
      }, async args => {
        if (!args.path.startsWith(".") || args.resolveDir.includes("node_modules")) {
          return {
            path: args.path,
            external: true
          };
        }
        const pathMaybeNoExt = path.resolve(args.resolveDir, args.path);
        const pathNoExt = pathMaybeNoExt.endsWith(".ts") ? pathMaybeNoExt.substring(0, pathMaybeNoExt.length - 3) : pathMaybeNoExt;
        const absolutePath = pathNoExt + ".ts";
        const absolutePathByIndex = path.join(pathNoExt, "index.ts");

        let usingIndex = false;
        try {
          await stat(absolutePathByIndex);
          usingIndex = true;
        } catch (ignored) {
        }

        const usingPath = usingIndex ? absolutePathByIndex : absolutePath;
        filesLoaded += 1;

        const relativePath = path.relative(currentFileLocation, usingPath).substring(3);
        spinner.text = `Resolved ${filesLoaded} files: ${relativePath}`;
      });
      build.onEnd(() => {
        const compilationEnded = performance.now();
        const timeTakenMs = compilationEnded - compilationStart;
        spinner.succeed(`Compiled ${filesLoaded} files in ${(timeTakenMs / 1000).toFixed(2)}s`);
      });
    }
  }],
  target: "es2022"
});