Repackage without rollup to improve tree-shaking

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hebcal/rest-api",
-  "version": "6.0.3",
+  "version": "6.1.0",
   "author": "Michael J. Radwin (https://github.com/mjradwin)",
   "keywords": [
     "hebcal"
@@ -9,14 +9,15 @@
   "engines": {
     "node": ">= 18.0.0"
   },
-  "module": "./dist/index.mjs",
+  "module": "./dist/esm/index.js",
+  "typings": "dist/esm/index.d.ts",
   "type": "module",
-  "typings": "./dist/index.d.ts",
   "exports": {
     ".": {
-      "import": "./dist/index.mjs",
-      "types": "./dist/index.d.ts"
-    }
+      "import": "./dist/esm/index.js",
+      "types": "./dist/esm/index.d.ts"
+    },
+    "./dist/esm/*": "./dist/esm/*.js"
   },
   "files": [
     "dist"

rollup.config.cjs

@@ -4,6 +4,7 @@ const json = require('@rollup/plugin-json');
 const terser = require('@rollup/plugin-terser');
 const typescript = require('@rollup/plugin-typescript');
 const pkg = require('./package.json');
+const {defineConfig} = require('rollup');
 
 const banner = '/*! ' + pkg.name + ' v' + pkg.version + ' */';
 
@@ -30,13 +31,23 @@ const iifeGlobals = {
   '@hebcal/triennial': 'hebcal__triennial',
 };
 
-module.exports = [
+const tsOptions = {rootDir: './src'};
+module.exports = defineConfig([
   {
     input: 'src/index.ts',
-    output: [{file: pkg.module, format: 'es', name: pkg.name, banner}],
+    output: [
+      {
+        dir: 'dist/esm',
+        format: 'es',
+        preserveModules: true,
+        preserveModulesRoot: 'src',
+        name: pkg.name,
+        banner,
+      },
+    ],
     plugins: [
       json({compact: true, preferConst: true}),
-      typescript(),
+      typescript({...tsOptions, outDir: 'dist/esm'}),
       nodeResolve(),
       commonjs(),
     ],
@@ -98,4 +109,4 @@ module.exports = [
     ],
     external: [/@hebcal/],
   },
-];
+]);