rompetroll/esm-mock

example showing difficulties in mocking modules with esm loader

esm-mock

example showing difficulties in mocking modules with esm loader

1. node 12 commonjs

the master branch is the baseline. running npm run test works as expected.

2. node 14 esm

the first iteration is the branch esm-module. The test breaks because of esm issues within tap. The internet suggests that this will be resolved in the next tap version, v15. For now the --no-esm parameter should help.

3. fix tap

So the second intertion here is branch no-esm. While --no-esm fixes our previous issue, we get a new one:

4. rewiremock

Apparently sinon cannot mock dependencies in esm modules, because esm imports are immutable. Again, the internet has suggestions to help: try a link seam. rewiremock is one link-seam capable mock loader so let's try in branch rewiremock Unfortunately rewiremock won't load though