message: Expose package subpaths with the "exports" field
diff: "license": "Apache-2.0",
  "main": "es/index.js",
  "module": "es/index.js",
  + "exports": {
  + "./es/": "./es/",
  + "./custom-elements.json": "./custom-elements.json",
  + "./package.json": "./package.json"
  + },
  "typings": "es/index.d.ts",
  "repository": "https://github.com/carbon-design-system/carbon-custom-elements",
  "bugs": "https://github.com/carbon-design-system/carbon-custom-elements/issues",
  