tsconfig.json

{
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/__tests__/*"],

  "compilerOptions": {
    "declaration": true,
    "module": "commonjs",
    "target": "es2017",
    "outDir": "./dist",
    "moduleResolution": "node",
    "sourceMap": true,

    /* Strict Type-Checking Options */
    "strict": true,                           /* Enable all strict type-checking options. */
    "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. */
    "strictBindCallApply": true,              /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
    "strictPropertyInitialization": true,     /* Enable strict checking of property initialization in classes. */
    "noImplicitThis": true,                   /* Raise error on 'this' expressions with an implied 'any' type. */
    "alwaysStrict": true,                     /* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
    "noUnusedLocals": true,                   /* Report errors on unused locals. */
    "noUnusedParameters": true,               /* Report errors on unused parameters. */
    "noImplicitReturns": true,                /* Report error when not all code paths in function return a value. */
    "noFallthroughCasesInSwitch": true,       /* Report errors for fallthrough cases in switch statement. */

    "importsNotUsedAsValues": "error",
    "isolatedModules": true,

    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  }
}