successfully installed and add flow dependency to package.json file

.babelrc

@@ -0,0 +1,4 @@
+{
+    "presets": ["@babel/preset-flow"],
+    "plugins": ["babel-plugin-syntax-hermes-parser"],
+  }

.flowconfig

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+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+untyped-type-import=error
+internal-type=error
+deprecated-type-bool=error
+
+[options]
+
+[strict]

lib/admin/search.js

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+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const sanitizeHTML = require('sanitize-html');
+const nconf = require('nconf');
+const winston = require('winston');
+const file = require('../file');
+const {
+  Translator
+} = require('../translator');
+function filterDirectories(directories) {
+  return directories.map(dir => dir.replace(/^.*(admin.*?).tpl$/, '$1').split(path.sep).join('/')).filter(dir => !dir.endsWith('.js') && !dir.includes('/partials/') && /\/.*\//.test(dir) && !/manage\/(category|group|category-analytics)$/.test(dir));
+}
+async function getAdminNamespaces() {
+  const directories = await file.walk(path.resolve(nconf.get('views_dir'), 'admin'));
+  return filterDirectories(directories);
+}
+function sanitize(html) {
+  return sanitizeHTML(html, {
+    allowedTags: [],
+    allowedAttributes: []
+  });
+}
+function simplify(translations) {
+  return translations.replace(/(?:\{{1,2}[^}]*?\}{1,2})/g, '').replace(/(?:[ \t]*[\n\r]+[ \t]*)+/g, '\n').replace(/[\t ]+/g, ' ');
+}
+function nsToTitle(namespace) {
+  return namespace.replace('admin/', '').split('/').map(str => str[0].toUpperCase() + str.slice(1)).join(' > ').replace(/[^a-zA-Z> ]/g, ' ');
+}
+const fallbackCache = {};
+async function initFallback(namespace) {
+  const template = await fs.promises.readFile(path.resolve(nconf.get('views_dir'), `${namespace}.tpl`), 'utf8');
+  const title = nsToTitle(namespace);
+  let translations = sanitize(template);
+  translations = Translator.removePatterns(translations);
+  translations = simplify(translations);
+  translations += `\n${title}`;
+  return {
+    namespace: namespace,
+    translations: translations,
+    title: title
+  };
+}
+async function fallback(namespace) {
+  if (fallbackCache[namespace]) {
+    return fallbackCache[namespace];
+  }
+  const params = await initFallback(namespace);
+  fallbackCache[namespace] = params;
+  return params;
+}
+async function initDict(language) {
+  const namespaces = await getAdminNamespaces();
+  return await Promise.all(namespaces.map(ns => buildNamespace(language, ns)));
+}
+async function buildNamespace(language, namespace) {
+  const translator = Translator.create(language);
+  try {
+    const translations = await translator.getTranslation(namespace);
+    if (!translations || !Object.keys(translations).length) {
+      return await fallback(namespace);
+    }
+    let str = Object.keys(translations).map(key => translations[key]).join('\n');
+    str = sanitize(str);
+    let title = namespace;
+    title = title.match(/admin\/(.+?)\/(.+?)$/);
+    title = `[[admin/menu:section-${title[1] === 'development' ? 'advanced' : title[1]}]]${title[2] ? ` > [[admin/menu:${title[1]}/${title[2]}]]` : ''}`;
+    title = await translator.translate(title);
+    return {
+      namespace: namespace,
+      translations: `${str}\n${title}`,
+      title: title
+    };
+  } catch (err) {
+    winston.error(err.stack);
+    return {
+      namespace: namespace,
+      translations: ''
+    };
+  }
+}
+const cache = {};
+async function getDictionary(language) {
+  if (cache[language]) {
+    return cache[language];
+  }
+  const params = await initDict(language);
+  cache[language] = params;
+  return params;
+}
+module.exports.getDictionary = getDictionary;
+module.exports.filterDirectories = filterDirectories;
+module.exports.simplify = simplify;
+module.exports.sanitize = sanitize;
+require('../promisify')(module.exports);

lib/admin/versions.js

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+'use strict';
+
+const request = require('../request');
+const meta = require('../meta');
+let versionCache = '';
+let versionCacheLastModified = '';
+const isPrerelease = /^v?\d+\.\d+\.\d+-.+$/;
+const latestReleaseUrl = 'https://api.github.com/repos/NodeBB/NodeBB/releases/latest';
+async function getLatestVersion() {
+  const headers = {
+    Accept: 'application/vnd.github.v3+json',
+    'User-Agent': encodeURIComponent(`NodeBB Admin Control Panel/${meta.config.title}`)
+  };
+  if (versionCacheLastModified) {
+    headers['If-Modified-Since'] = versionCacheLastModified;
+  }
+  const {
+    body: latestRelease,
+    response
+  } = await request.get(latestReleaseUrl, {
+    headers: headers,
+    timeout: 2000
+  });
+  if (response.statusCode === 304) {
+    return versionCache;
+  }
+  if (response.statusCode !== 200) {
+    throw new Error(response.statusText);
+  }
+  if (!latestRelease || !latestRelease.tag_name) {
+    throw new Error('[[error:cant-get-latest-release]]');
+  }
+  const tagName = latestRelease.tag_name.replace(/^v/, '');
+  versionCache = tagName;
+  versionCacheLastModified = response.headers['last-modified'];
+  return versionCache;
+}
+exports.getLatestVersion = getLatestVersion;
+exports.isPrerelease = isPrerelease;
+require('../promisify')(exports);

lib/als.js

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+'use strict';
+
+const {
+  AsyncLocalStorage
+} = require('async_hooks');
+const asyncLocalStorage = new AsyncLocalStorage();
+module.exports = asyncLocalStorage;