tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "lib": ["esnext", "esnext.asynciterable"],                             /* Specify library files to be included in the compilation:  */
     "declaration": true,                   /* Generates corresponding '.d.ts' file. */
     "sourceMap": true,                     /* 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": true,                /* Do not emit comments to output. */
    "typeRoots": [
      "src/types", "node_modules/@types"],

    /* 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. */
     "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. */

     "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */

     "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     "emitDecoratorMetadata": true         /* Enables experimental support for emitting type metadata for decorators. */
  },
  "include": ["src", ".eslintrc.js"]
}