Flow exact-by-default jscodeshift transform

transform.js

module.exports = function transformer(file, api) {
  const j = api.jscodeshift;
  const root = j(file.source);

  root
    .find(j.ObjectTypeAnnotation, {inexact: false, exact: false})
    .forEach(path => {
      path.node.inexact = true;
    });
  return root.toSource();
};

module.exports.parser = 'flow';