tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es5",
    "sourceMap": true,
    "outDir": "./lib",
    "rootDir": "./src",
    "baseUrl": "./",
    "incremental": true,
    "strict": true,
    "noImplicitAny": true,
    "alwaysStrict": true,
    "strictNullChecks": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noFallthroughCasesInSwitch": true,
    "resolveJsonModule": true,
    "composite": true,
    "declarationMap": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["es2015", "es5", "dom"],
    "moduleResolution": "node",
    "noEmitOnError": true,
    "preserveSymlinks": true,
    "preserveWatchOutput": true,
    "pretty": false
  }
}