esbuild config to accept external node_modules

esbuild.js

const nativeNodeModulesPlugin = {
  name: "native-node-modules",
  setup(build) {
    let filter = /^[^.\/]|^\.[^.\/]|^\.\.[^\/]/; // Must not start with "/" or "./" or "../"
    build.onResolve({ filter }, (args) => ({
      path: args.path,
      external: true,
    }));
    // If a ".node" file is imported within a module in the "file" namespace, resolve
    // it to an absolute path and put it into the "node-file" virtual namespace.
    build.onResolve({ filter: /\.node$/, namespace: "file" }, (args) => ({
      path: require.resolve(args.path, { paths: [args.resolveDir] }),
      namespace: "node-file",
    }));

    // Files in the "node-file" virtual namespace call "require()" on the
    // path from esbuild of the ".node" file in the output directory.
    build.onLoad({ filter: /.*/, namespace: "node-file" }, (args) => ({
      contents: `
          import path from ${JSON.stringify(args.path)}
          try { module.exports = require(path) }
          catch {}
        `,
    }));

    // If a ".node" file is imported within a module in the "node-file" namespace, put
    // it in the "file" namespace where esbuild's default loading behavior will handle
    // it. It is already an absolute path since we resolved it to one above.
    build.onResolve({ filter: /\.node$/, namespace: "node-file" }, (args) => ({
      path: args.path,
      namespace: "file",
    }));

    // Tell esbuild's default loading behavior to use the "file" loader for
    // these ".node" files.
    let opts = build.initialOptions;
    opts.loader = opts.loader || {};
    opts.loader[".node"] = "file";
  },
};

require("esbuild")
  .build({
    entryPoints: ["src/vcm.ts"],
    bundle: true,
    outfile: "dist/vcm.js",
    platform: "node",
    target: ["node14.18"],
    plugins: [nativeNodeModulesPlugin],
    minify: true,
  })
  .catch(() => process.exit(1));