success/scripts/buildPackage.js

const path = require("path");
const { build } = require("esbuild");
const { sassPlugin } = require("esbuild-sass-plugin");

// excludes all external dependencies and bundles only the source code
const getConfig = (outdir) => ({
  outdir,
  bundle: true,
  splitting: true,
  format: "esm",
  packages: "external",
  plugins: [sassPlugin()],
  target: "es2020",
  assetNames: "[dir]/[name]",
  chunkNames: "[dir]/[name]-[hash]",
  alias: {
    "@excalidraw/excalidraw": path.resolve(__dirname, "../packages/excalidraw"),
    "@excalidraw/utils": path.resolve(__dirname, "../packages/utils"),
    "@excalidraw/math": path.resolve(__dirname, "../packages/math"),
  },
  loader: {
    ".woff2": "file",
  },
});

function buildDev(config) {
  return build({
    ...config,
    sourcemap: true,
    define: {
      "import.meta.env": JSON.stringify({ DEV: true }),
    },
  });
}

function buildProd(config) {
  return build({
    ...config,
    minify: true,
    define: {
      "import.meta.env": JSON.stringify({ PROD: true }),
    },
  });
}

const createESMRawBuild = async () => {
  const chunksConfig = {
    entryPoints: ["index.tsx", "**/*.chunk.ts"],
    entryNames: "[name]",
  };

  // development unminified build with source maps
  await buildDev({
    ...getConfig("dist/dev"),
    ...chunksConfig,
  });

  // production minified buld without sourcemaps
  await buildProd({
    ...getConfig("dist/prod"),
    ...chunksConfig,
  });
};

(async () => {
  await createESMRawBuild();
})();