block-dev-tool/routes/base-view.js

import {getBlockConfigs, getBlockName, getBlockVariations, handlebarLayoutsPath} from "../helpers.js";
import path from "path";
import {buildAssetFiles} from "../inc/changes-watcher.js";

export default async function (req, res) {
  const blockName = req.query.block;
  const block = getBlockName(blockName);

  const blockDir = path.join('blocks', '@' + block.project, block.name);
  const dataFiles = await getBlockVariations(blockDir);

  const data = await getDataOfFrame(!!req.query.iframe, Object.assign({}, block, {dataFiles}));

  if (data.error && data.errorMessage) {
    return res.send(data.errorMessage);
  }

  const baseView = req.params.baseView ?? 'alignfull';

  await buildAssetFiles(blockDir);

  res.render(baseView, data)
}

async function getDataOfFrame(isIframe = false, block) {
  const data = {config: await getBlockConfigs(block)};
  if (data.error && data.errorMessage) {
    return data;
  }

  data.helpers = {
    include_partial: (filesPath) => handlebarLayoutsPath(filesPath),
  }

  if (isIframe) {
    data.iframeMode = true;
  }

  data.staticFilesPath = `/block/${block.project}/${block.name}`;

  return data;
}