tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es5",
    "module": "commonjs",
    "lib": [
      "dom",
      "es2017"
    ],
    "rootDir": "src",
    /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "allowJs": true,
    /* Allow javascript files to be compiled. */
    "checkJs": true,
    /* Report errors in .js files. */
    "jsx": "react",
    /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
    "declaration": true,
    /* Generates corresponding '.d.ts' file. */
    "declarationMap": true,
    /* Generates a sourcemap for each corresponding '.d.ts' file. */
    "sourceMap": true,
    /* Generates corresponding '.map' file. */
    "outDir": "lib",
    /* Redirect output structure to the directory. */

    /* 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. */
    "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. */

    /* Module Resolution Options */
    "allowSyntheticDefaultImports": true,
    /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
    "esModuleInterop": true,
    /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "noEmit": true,
    "skipLibCheck": true

  }
}