ts-jest supports a range of versions for
typescript. One uses incompatible versions will receive a warning
message while running tests. This warning message can be opt-out by setting environment variable
As long as the environment variable
TS_JEST_DISABLE_VER_CHECKER stays, the warning message will no longer show.
This can lead to unexpected errors due to the usage of incompatible versions' dependencies. Use this environment variable with precautions.