Mailspring/app/internal_packages/message-autoload-images/lib/autoload-images-extension.ts

import { MessageViewExtension } from 'mailspring-exports';
import AutoloadImagesStore from './autoload-images-store';

export default class AutoloadImagesExtension extends MessageViewExtension {
  static formatMessageBody = ({ message }) => {
    if (AutoloadImagesStore.shouldBlockImagesIn(message)) {
      message.body = message.body.replace(AutoloadImagesStore.getLinkTagRegexp(), '');
      message.body = message.body.replace(
        AutoloadImagesStore.getImagesRegexp(),
        (match, prefix) => {
          return `${prefix}#`;
        }
      );
    }
  };
}