tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "esnext",
    "lib": [
      "es2018",
      "dom"
    ],
    "declaration": true,
    "outDir": "./esm",
    "rootDir": "./src",
    "importHelpers": true,
    "downlevelIteration": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "resolveJsonModule": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "typeRoots": [
      "typings",
      "node_modules/@types"
    ],
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "experimentalDecorators": true
  },
  "exclude": [
    "node_modules",
    "examples"
  ]
}