src/language-js/print/assignment.js/printVariableDeclarator
function printVariableDeclarator(path, options, print) {
  const n = path.getValue();
  return printAssignment(
    n.id,
    path.call(print, "id"),
    " =",
    n.init,
    n.init && path.call(print, "init"),
    options
  );
}