tsconfig.json

{
  "compilerOptions": {
    "outDir": "./dist",
    "declaration": true,
    "declarationDir": "dist",
    "allowJs": true,
    "target": "es5",
    "lib": ["esnext", "dom"],
    "esModuleInterop": true,
    "sourceRoot": "/",
    "moduleResolution": "node",
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "rootDir": "./",

    /* ------ Our additional configuration ------ */

    /* Basic Options */
    "strict": true /* Enable all strict type-checking options. */,
    "removeComments": false /* Do not emit comments to output. Must be false so jsdocs works */,

    /* Strict Type-Checking Options */
    "noImplicitReturns": true,
    "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
    "strictNullChecks": true /* Enable strict null checks. */,
    "strictFunctionTypes": true /* Enable strict checking of function types. */,
    "strictPropertyInitialization": true /* Enable strict checking of property initialization in classes. */,
    "noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */,

    /* Module Resolution Options */
    "allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,

    /* Additional Checks */
    "noUnusedLocals": false /* Report errors on unused locals. */,
    "noUnusedParameters": false /* Report errors on unused parameters. */,
    "preserveConstEnums": true,

    /* Source Map Options */
    "sourceMap": true /* Generates corresponding '.map' file. */
  },
  "exclude": ["dist", "node_modules", "build"],
  "include": ["./src/**/*", "./tests/**/*"]
}