tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015",
    "allowJs": true,
    "checkJs": true,
    "noEmit": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictBindCallApply": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,

    /* 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. */
    // "noUncheckedIndexedAccess": true,            /* Include 'undefined' in index signature results */
    "noImplicitOverride": true,                  /* Ensure overriding members in derived classes are marked with an 'override' modifier. */
    "noPropertyAccessFromIndexSignature": true,  /* Require undeclared properties from index signatures to use element accesses. */

    "moduleResolution": "node",
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "lib": ["ES2019"],
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["scripts", "__tests__", "lib.es5.d.ts"]
}