If instead of babel you're using ts-jest, configure ts-jest as the transformer by running

npx ts-jest config:init

See https://kulshekhar.github.io/ts-jest/docs/getting-started/installation/#jest-config-file

This will add the following to your jest.config.js config file:

  transform: {
    "^.+.tsx?$": ["ts-jest",{}],
  },