tsconfig.json

{
  "compilerOptions": {
    "target": "es5",                        /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
    "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. */
    "strict": true,                         /* Enable all strict type-checking options. */
    "strictNullChecks": true,
    "module": "commonjs",
    "sourceMap": true,
    "noImplicitAny" :true,
    "noImplicitThis": true,
    "lib": ["es5", "es2017", "dom"],
    "declaration": true,
    "resolveJsonModule": true
  },
  "include": ["src/**/*"],
  "exclude": ["test/**/*"]
}