MacOS Bash Command to Create (empty) Test Files for any JavaScript or TypeScript files in your project.

add-tests.sh

#!/bin/bash
find . \( -iname "*.js*" -or -iname "*.ts*" \) \
  -and \( ! -path "*/__mocks__/*" ! -name "*.test.*" ! -name "*.spec.*" \) \
  -exec sh -c \
  'b=$(basename $1);f=${b%.*};d=$(dirname $1);e=${b##*.}; mkdir -p $d/__tests__ && > $d/__tests__/$f.test.$e' \
  sh {} \;

What is the difference between using sh in my script and bash in yours?

bash starts Bash, sh depends on some settings.