tsconfig.esm.json

{
  "compileOnSave": false,
  "buildOnSave": false,
  "compilerOptions": {
    "outDir": "./lib/esm",
    "target": "es5",
    "module": "es2015",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "declaration": true,
    "lib": ["es2015", "es2015.iterable", "dom"],
    "skipLibCheck": true
  },
  "exclude": ["lib", "node_modules", "spec", "release", "examples"],
  "angularCompilerOptions": {
    "generateCodeForLibraries": false,
    "strictMetadataEmit": true,
    "genDir": ".compiled",
    "annotationsAs": "decorators"
  }
}