tsconfig-base.json

{
  "$schema": "http://json.schemastore.org/tsconfig",

  "compilerOptions": {
    "outDir": "lib",
    "rootDir": "src",

    "forceConsistentCasingInFileNames": true,
    "jsx": "react",
    "declaration": true,
    "sourceMap": true,
    "declarationMap": true,
    "inlineSources": true,
    "experimentalDecorators": true,
    "strictNullChecks": true,
    "noUnusedLocals": true,
    "types": ["jest", "webpack-env"],

    "isolatedModules": true,
    "verbatimModuleSyntax": true,

    "module": "esnext",
    "moduleResolution": "node",
    "target": "es5",
    "lib": [
      "es5",
      "scripthost",
      "es2015.collection",
      "es2015.promise",
      "es2015.iterable",
      "es2015.symbol.wellknown",
      "dom"
    ]
  }
}