tsconfig.json

{
    "compilerOptions": {
      "target": "es5", // Specify ECMAScript target version
      "lib": [
        "dom",
        "dom.iterable",
        "esnext"
      ], // List of library files to be included in the compilation
      "allowJs": true, // Allow JavaScript files to be compiled
      "skipLibCheck": true, // Skip type checking of all declaration files
      "esModuleInterop": true, // Disables namespace imports (import * as fs from "fs") and enables CJS/AMD/UMD style imports (import fs from "fs")
      "allowSyntheticDefaultImports": true, // Allow default imports from modules with no default export
      "strict": true, // Enable all strict type checking options
      "forceConsistentCasingInFileNames": true, // Disallow inconsistently-cased references to the same file.
      "module": "esnext", // Specify module code generation
      "moduleResolution": "node", // Resolve modules using Node.js style
      "isolatedModules": true, // Unconditionally emit imports for unresolved files
      "resolveJsonModule": true, // Include modules imported with .json extension
      "noEmit": true, // Do not emit output (meaning do not compile code, only perform type checking)
      "jsx": "react", // Support JSX in .tsx files
      "sourceMap": true, // Generate corrresponding .map file
      "declaration": true, // Generate corresponding .d.ts file
      "noUnusedLocals": false, // Report errors on unused locals
      "noUnusedParameters": false, // Report errors on unused parameters
      "incremental": true, // Enable incremental compilation by reading/writing information from prior compilations to a file on disk
      "noFallthroughCasesInSwitch": true // Report errors for fallthrough cases in switch statement
    },
    "include": [
      "src/**/*" // *** The files TypeScript should type check ***
    ],
    "exclude": ["node_modules", "build"] // *** The files to not type check ***
  }