tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es2015",
    "declaration": true,
    "declarationMap": true,

    /* Strict Type-Checking Options */
    "strict": true,
    "alwaysStrict": true,

    /* 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. */

    /* Module Resolution Options */
    "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */

    "outDir": "tmp"
  },

  "files": [
    "src/index.ts",
    "src/types.ts",
    "src/unit.ts",
  ]
}