tsconfig.es5-esm.json

{
  "extends": "./tsconfig.base",
  "compilerOptions": {
    "target": "es5",
    "module": "es2015",
    "lib": [
      "dom",
      "es5",
      "es2015.promise",
      "es2015.collection",
      "es2015.iterable"
    ],
    "outDir": "./dist/es5-esm"
  }
}