tsconfig-base.json

{
  "$schema": "http://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "composite": true,
    "declaration": true,
    "declarationMap": true,
    "esModuleInterop": true,
    "incremental": true,
    "inlineSources": true,
    "lib": ["dom", "es6"],
    "jsx": "react",
    "module": "commonjs",
    "moduleResolution": "node",
    "noEmitOnError": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "preserveWatchOutput": true,
    "resolveJsonModule": true,
    "sourceMap": true,
    "strict": true,
    "strictNullChecks": false,
    "target": "es6"
  }
}