[codemods - Medium post]

collect-gb-usages.js

const collectGBUsages = (refStore, store) => node =>
  node.find(j.MemberExpression, { // XX.XXXX
    object: { type: 'MemberExpression' },
  })
  .filter(path => (
    path.parentPath.value.type !== 'AssignmentExpression' &&
    isGBNamespaced(path.value) // Check GB.xxx
  ))
  .forEach(path => {
    refStore.add(path);

    const type = path.value.object.property.name;
    const name = path.value.property.name;
    if (!store.has(type)) {
      store.set(type, new Set());
    }
    store.set(type, store.get(type).add(name));
  });