Problem with ts-jest - typings not updated

Reported here: kulshekhar/ts-jest#1122 (comment) kulshekhar/ts-jest#943 (comment)

Steps to reproduce:

• run jest with watch $ npm test -- --watch
• go into src/add.test.ts and edit the import from add1 to add2 in both import and where the function is used
• see the error:

 FAIL  src/add.test.ts
 ● Test suite failed to run

 src/add.test.ts:1:10 - error TS2305: Module '"./add"' has no exported member 'add2'.

1 import { add2 } from "./add";

• go into ./add and fix the function to be called add2.
• see that the jest runner still say the same error
• restart the runner and see it works now