tsconfig.json

{
  "compilerOptions": {
    "target": "es5"   /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
    "module": "umd" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
    "lib": [] /* Specify library files to be included in the compilation. */,
    "declaration": true /* Generates corresponding '.d.ts' file. */,
    "declarationDir": "./dist" /* Output directory for generated declaration files. */,
    "sourceMap": false /* Generates corresponding '.map' file. */,
    "outDir": "./dist" /* Redirect output structure to the directory. */,
    "rootDir": "./src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "removeComments": false /* Do not emit comments to output. */,
    "strict": true /* Enable all strict type-checking options. */,
    "noImplicitAny": false, /* Raise error on expressions and declarations with an implied 'any' type. */
    "noUnusedLocals": true /* Report errors on unused locals. */,
    "noUnusedParameters": true /* Report errors on unused parameters. */,
    "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
    "baseUrl": "./" /* The base directory to resolve non-absolute module names. */,
  },
  "include": ["./src/**/*"]
}