t3dotgg

// Types for the result object with discriminated union
type Success<T> = {
  data: T;
  error: null;
};

type Failure<E> = {
  data: null;
  error: E;
};

bunnymatic

Hop into a shell and to the root directory of your project and run 

    git ls-tree --name-only -z -r HEAD -- $1 | xargs -0 -n1 git blame --line-porcelain | grep "^author "|sort|uniq -c|sort -nr

Then wait a bit.  You get a nice sorted list of lines of code and author name.

Add it to your bash profile like this
    whodunit() {
      git ls-tree --name-only -z -r HEAD -- $1 | xargs -0 -n1 git blame --line-porcelain | grep "^author "|sort|uniq -c|sort -nr
    }