lambda-builder.ts

import * as pulumi from "@pulumi/pulumi";
import { buildSync } from "esbuild";

function build(entrypoint: string, minify: boolean, external: string[] = []) {
  const result = buildSync({
    bundle: true,
    minify,
    charset: "utf8",
    platform: "node",
    target: "node20.10",
    mainFields: ["module", "main"],
    external,
    entryPoints: [entrypoint],
    write: false
  });
  return result?.outputFiles?.[0].text ?? "";
}

export function buildCodeAsset(
  entrypoint: string,
  minify = false,
  external: string[] = []
): pulumi.asset.AssetArchive {
  return new pulumi.asset.AssetArchive({
    "index.js": new pulumi.asset.StringAsset(
      build(entrypoint, minify, external)
    )
  });
}