strapi/packages/core/admin/utils/should-build-admin.js

'use strict';

const path = require('path');
const fs = require('fs-extra');

const DEFAULT_PLUGINS = [
  'content-type-builder',
  'content-manager',
  'upload',
  'email',
  'i18n',
  'users-permissions',
];

/**
 * Checks if the project's installed plugins are not the same as a default one.
 * @param {Object} plugins
 * @returns {boolean}
 */
const hasNonDefaultPlugins = plugins => {
  // List of plugins that are not the ones installed in a generated app
  const installedPlugins = Object.keys(plugins).filter(x => !DEFAULT_PLUGINS.includes(x));

  // List of default plugins uninstalled from a generated app
  const missingPlugins = DEFAULT_PLUGINS.filter(x => !Object.keys(plugins).includes(x));

  const diff = [...installedPlugins, ...missingPlugins];

  return diff.length > 0;
};

const hasCustomAdminCode = async (dir, useTypeScript) => {
  const customAdminPath = path.join(dir, 'src', 'admin');
  const customAdminConfigFileExtension = useTypeScript ? 'app.tsx' : 'app.js';
  const customAdminConfigFile = path.join(customAdminPath, customAdminConfigFileExtension);
  const customAdminWebpackFile = path.join(customAdminPath, 'webpack.config.js');

  const hasCustomConfigFile = await fs.pathExists(customAdminConfigFile);
  const hasCustomWebpackFile = await fs.pathExists(customAdminWebpackFile);

  return hasCustomConfigFile || hasCustomWebpackFile;
};

const shouldBuildAdmin = async ({ appDir, plugins, useTypeScript }) => {
  const appHasCustomAdminCode = await hasCustomAdminCode(appDir, useTypeScript);
  const appHasNonDefaultPlugins = hasNonDefaultPlugins(plugins);

  return appHasCustomAdminCode || appHasNonDefaultPlugins;
};

module.exports = shouldBuildAdmin;