Best defaults for TypeScript as of Spring 2018

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "strict": true,
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "noUnusedLocals": true,
    "lib": [
      "es7",
      "dom"
    ]
  }
}