tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
    "module": "es6" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,

    "declaration": true /* Generates corresponding '.d.ts' file. */,
    "declarationMap": true /* Generates a sourcemap for each corresponding '.d.ts' file. */,
    "sourceMap": true /* Generates corresponding '.map' file. */,

    "outDir": "./dist-esm" /* Redirect output structure to the directory. */,
    "declarationDir": "./typings", /* Output directory for generated declaration files.*/

    "importHelpers": true /* Import emit helpers from 'tslib'. */,

    /* Strict Type-Checking Options */
    "strict": true /* Enable all strict type-checking options. */,
    "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */

    /* Additional Checks */
    "noUnusedLocals": true,                /* Report errors on unused locals. */

    /* Module Resolution Options */
    "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
    "allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,

    /* Experimental Options */
    "forceConsistentCasingInFileNames": true,

    /* Other options */
    "newLine": "LF", /*	Use the specified end of line sequence to be used when emitting files: "crlf" (windows) or "lf" (unix).”*/
    "allowJs": false, /* Don't allow JavaScript files to be compiled.*/
  },
  "compileOnSave": true,
  "exclude": [
    "node_modules",
    "typings/**",
    "./examples/**/*.ts"
  ],
  "include": [
    "./lib/**/*.ts",
    "./tests/**/*.ts",
  ]
}