tsconfig.json

{
    "compilerOptions": {
        /* Basic Options */
        "target": "es2017",
        /* 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": [
            "es2018",
        ],
        /* Specify library files to be included in the compilation:  */
        "rootDir": "./src",
        "declaration": true,
        "outDir": "./dest",
        /* Redirect output structure to the directory. */
        "experimentalDecorators": true,
        /* Enables experimental support for ES7 decorators. */
        "emitDecoratorMetadata": true,
        /* Enables experimental support for emitting type metadata for decorators. */
        "noStrictGenericChecks": true
    },
    "include": ["./src"]
}