message: changesets: update changeset to include instructions for how to work around re-export issue
diff: @@ -23,3 +23,21 @@ In order to switch back to `ts-jest`, install `ts-jest@^26.4.3` as a dependency
  ```
  Note that this will override the default jest transforms included with the `@backstage/cli`.
  +
  +It is possible that some test code needs a small migration as a result of this change, which stems from a difference in how `sucrase` and `ts-jest` transform module re-exports.
  +
  +Consider the following code:
  +
  +```ts
  +import * as utils from './utils';
  +
  +jest.spyOn(utils, 'myUtility').mockReturnValue(3);
  +```
  +
  +If the `./utils` import for example refers to an index file that in turn re-exports from `./utils/myUtility`, you would have to change the code to the following to work around the fact that the exported object from `./utils` ends up not having configurable properties, thus breaking `jest.spyOn`.
  +
  +```ts
  +import * as utils from './utils/myUtility';
  +
  +jest.spyOn(utils, 'myUtility').mockReturnValue(3);
  +```
  