testdouble.js (AKA td.js) VS node

ESM modules need custom loaders for mocking. Testsouble (https://www.npmjs.com/package/testdouble) was one of the first frameworks to support it AFAIK and a great type-safe option.

Alternative is using testdouble with `td.object()` https://www.npmjs.com/package/testdouble

I’m not sure I manage to follow the author correctly, but to me it seems that by “mock” they strictly refer to external mocking libraries, in the sense of JS’s `testdouble` [1] or Java’s `Mockito` [2]. The fake object as returned by `LoginClient.createNull().getUserInfo(...)` appears to be a “Nullable” for them.

[1] https://www.npmjs.com/package/testdouble

If you need an alternative for mocking, testdouble.js has full ES module support thanks to some excellent work by Gil Tayar.

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