tsconfig.json

{
    "include": [ "src/**/*.ts" ],
    "compilerOptions": {
        // Type Checking
        "strict": true,
        "alwaysStrict": true,
        "allowUnreachableCode": false,
        "allowUnusedLabels": false,
        "noFallthroughCasesInSwitch": true,
        "noImplicitOverride": true,
        "noImplicitThis": true,
        "noImplicitReturns": true,
        "noUnusedParameters": false,
        "strictNullChecks": true,
        "useUnknownInCatchVariables": true, // https://www.typescriptlang.org/tsconfig#useUnknownInCatchVariables
  
        // Modules
        "module": "CommonJS",
        "moduleResolution": "node",
        "baseUrl": "./src",
  
        // Emit
        "declaration": true,
        "outDir": "./lib",
  
        // JS Support
  
        // Editor Support
  
        // Interop Constraints
        "esModuleInterop": true,
        "forceConsistentCasingInFileNames": true,
  
        // Backwards Compatibility
  
        // Language & Environment
        "lib": [ "es2017" ],
        "target": "es2017",
  
        // Compiler Diagnostics
  
        // Projects
  
        // Output Formatting
  
        // Completeness
        "skipLibCheck": true
  
        // Command Line
  
        // Watch Options
    }
  }