Esbuild, build esm

scripts/build.js

@@ -59,9 +59,16 @@ function runBuild(entry, outfile) {
     ],
   }
 
+  const { compilerOptions } = tsconfigPathPluginContent
+  const format =
+    compilerOptions.target === "es6" && compilerOptions.module !== "commonjs"
+      ? "esm"
+      : undefined
+
   build({
     ...sharedConfig,
     platform: "node",
+    format,
     outfile,
   }).then(result => {
     glob(`${process.cwd()}/src/**/*.hbs`, {}, (err, files) => {