tsconfig.json

{
  "compilerOptions": {
    "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'. */
    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
    "sourceMap": true,
    "outDir": "./dist/commonjs",              /* Redirect output structure to the directory. */
    "rootDir": "./src/ts",                    /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "lib": [
      "es6"
    ],

    /* Strict Type-Checking Options */
    "strict": true,                        /* Enable all strict type-checking options. */
    "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "preserveConstEnums": true,

    /* Module Resolution Options */
    "moduleResolution": "node",           /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "baseUrl": "./src/ts"                 /* Base directory to resolve non-absolute module names. */
  },
  "exclude": [
    "./src/usage/ts/*",
    "./dist/commonjs/*"
 ]
}