tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "checkJs": false,
    "outDir": "dist",
    "removeComments": false /* to be able to ignore some lines from coverage */,
    "sourceMap": true,
    "esModuleInterop": true, // Because of JSONPath
    "typeRoots": ["node_modules/@types", "types"],
    "allowSyntheticDefaultImports": true,
    "target": "es2015",
    "moduleResolution": "node",
    "module": "commonjs",
    "noEmit": true,
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "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. */,
    "strictPropertyInitialization": true /* Enable strict checking of property initialization in classes. */,
    "noImplicitThis": false /* 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. */,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["lib/**/*", "tests/**/*"]
}