tsconfig.json

{
  "compilerOptions": {
    "baseUrl": ".",
    "rootDir": ".",

    // emit files to the `types` dir, these are ignored by everything but TS needs _somewhere_ to emit
    "outDir": "types",

    // generate declaration files
    "declaration": true,

    // don't allow un-used variables
    "noUnusedLocals": true,

    // Enables all strict type checking options.
    "strict": true,

    // Output as ES Modules & esnext code, webpack will handle further conversion
    "module": "es6",
    "target": "esnext",

    // Allows default imports from modules with no default export. This does not affect code emit, just type checking.
    // We have to enable this option explicitly since `esModuleInterop` doesn't enable it automatically when ES2015 or
    // ESNext module format is used.
    "allowSyntheticDefaultImports": true,

    // Support .tsx files and transform JSX into calls to React.createElement
    "jsx": "react",

    // Emits __importStar and __importDefault helpers for runtime babel ecosystem compatibility.
    "esModuleInterop": true,

    // Resolve modules in the same way as Node.js. Aka make `require` works the
    // same in TypeScript as it does in Node.js.
    "moduleResolution": "node",

    // Disallow inconsistently-cased references to the same file.
    "forceConsistentCasingInFileNames": true,

    // Disable the breaking keyof behaviour introduced in TS 2.9.2 until EUI is updated to support that too
    "keyofStringsOnly": true,

    // enables "core language features"
    "lib": [
      // ESNext auto includes previous versions all the way back to es5
      "esnext",
      // includes support for browser APIs
      "dom"
    ],

    // Specifies where to find library definitions. When this is explicitly set,
    // it has to include the default location i.e. node_modules/@types
    "typeRoots": ["node_modules/@types", "custom_typings"]
  },
  "include": [
    "./src/**/*",
    "./src-docs/**/*"
  ]
}