function getClassEntry(obj) {
  let entry = null;
  // Start lookup if Program body has ClassDeclaration or inside ExportDefaultDeclaration has ClassDeclaration
  for (let elem of obj.body) {
    if (elem.type === 'ClassDeclaration') {
      return entry = elem.body;
    }
    else if (elem.type === 'ExportDefaultDeclaration' && elem.declaration.type === 'ClassDeclaration') {
      return entry = elem.declaration.body;
    }
  }
  return entry;
}
Iterates through AST Object and returns the entry point for the Class or Function Block;
@param {Object} obj AST JSON Object