ts-node

TypeScriptをnode.jsで動かす $ ts-node src/foo.ts :

import { Foo } from "./Bar";
       ^

SyntaxError: Unexpected token {

$ node -v

• v11.14.0

$ node -v

• v13.9.0 :

(node:39469) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
import { Foo } from "./Bar";
^^^^^^

SyntaxError: Cannot use import statement outside a module

tsconfig.json diff

- "module": "esnext",
+ "module": "commonjs",

これで動くようになったのだが、umdとかの方が良いのだろうか？