tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig to read more about this file */

    /* Language and Environment */
    "target": "es2016",
    "lib": ["ES6"],
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,

    /* Modules */
    // "moduleResolution": "Node",
    "module": "CommonJS",
    "typeRoots": ["./source/@types", "./node_modules/@types"],
    // "types": [],

    /* Emit */
    "outDir": "./build",
    "removeComments": true,

    /* Interop Constraints */
    // "isolatedModules": true,
    // "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,

    /* Type Checking */
    "strict": true,
    "noImplicitAny": true,
    // "strictNullChecks": true,
    "strictFunctionTypes": true,
    // "strictBindCallApply": true,
    "strictPropertyInitialization": true,
    // "noImplicitTsource/@types
    // "useUnknownInCatchVariables": true,
    // "alwaysStrict": true,
    // "noUnusedLocals": true,
    // "noUnusedParameters": true,
    // "exactOptionalPropertyTypes": true,
    // "noImplicitReturns": true,
    // "allowUnusedLabels": true,
    // "allowUnreachableCode": true,

    /* Completeness */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  },
  "include": ["./source", "__mocks__"]
}