Mailspring/app/internal_packages/category-picker/lib/main.jsx

const MovePicker = require('./move-picker');
const LabelPicker = require('./label-picker');

const { ComponentRegistry } = require('mailspring-exports');

module.exports = {
  activate(state = {}) {
    this.state = state;
    ComponentRegistry.register(MovePicker, { role: 'ThreadActionsToolbarButton' });
    ComponentRegistry.register(LabelPicker, { role: 'ThreadActionsToolbarButton' });
  },

  deactivate() {
    ComponentRegistry.unregister(MovePicker);
    ComponentRegistry.unregister(LabelPicker);
  },
};