chore: add ESM entry point to reference package (#1923)

Author: veu

packages/reference/package.json

@@ -8,6 +8,7 @@
     ".": {
       "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
+      "import": "./dist/esm/index.js",
       "default": "./dist/cjs/index.js"
     },
     "./package.json": "./package.json"