Jest has experimental support for ECMAScript Modules (ESM). It is useful because more libraries are starting to ship only ESM (that is, they are no longer shipping CommonJS).

Currently, when transforming TypeScript, vue-jest forces the use of CommonJS:

This means it is not possible to import ESM from a Vue SFC. It would be nice to have a way to override this so that it can be used in an otherwise ESM project.

(I realize that there's probably nobody around who'd want to work on this, but I figured I should at least document it for when I next try this again…)