Jest Json parser that outputs TAP results
Install jest-json-to-tap
npm install -g jest-json-to-tap
then you just need to redirect Jest's json output to it
$ jest --json 2>/dev/null | jest-json-to-tap
Beware in the command above we muted stderr to remove all extra msgs that jest outputs on stderr.
Based on the solution proposed by Edvin Erikson at https://medium.com/@edvinerikson/getting-jest-output-in-tap-format-6e07dc2c484c