Deeply compare two JavaScript objects

deepEqual.js

function deepEqual ( a, b ) {
  let equalCount = Object.keys( a ).length === Object.keys( b ).length;
  if ( equalCount ){
    for ( let key in a ){
      if ( typeof a[key] === typeof b[key] ){
        if ( typeof a[key] !== "object" ){
          if ( a[key] !== b[key] ){
            return false;
          }
        } else {
          let subKeyEqual = deepEqual( a[key], b[key] );
          if ( !subKeyEqual ){
            return false;
          }
        }
      } else {
        return false;
      }
    }
  } else {
    return false;
  }
  return true;
}