Separate backend from algorithm-visualizer repo

Author: 64json

.DS_Store

@@ -0,0 +1,6 @@
+/.idea
+/node_modules
+/npm-debug.log
+/public
+/pm2.config.js
+.DS_Store

.gitignore

@@ -0,0 +1,42 @@
+const {
+  __DEV__,
+  backendBuildPath,
+} = require('../environment');
+
+if (__DEV__) {
+  const webpack = require('webpack');
+  const webpackConfig = require('../webpack.backend.config.js');
+  const compiler = webpack(webpackConfig);
+
+  let backend = null;
+  let lastHash = null;
+  compiler.watch({
+    watchOptions: {
+      ignored: /public/,
+    },
+  }, (err, stats) => {
+    if (err) {
+      lastHash = null;
+      compiler.purgeInputFileSystem();
+      console.error(err);
+    } else if (stats.hash !== lastHash) {
+      lastHash = stats.hash;
+      console.info(stats.toString({
+        cached: false,
+        colors: true,
+      }));
+
+      delete require.cache[require.resolve(backendBuildPath)];
+      backend = require(backendBuildPath).default;
+    }
+  });
+
+  const backendWrapper = (req, res, next) => backend(req, res, next);
+  backendWrapper.getHierarchy = () => backend.hierarchy;
+  module.exports = backendWrapper;
+} else {
+  const backend = require(backendBuildPath).default;
+  const backendWrapper = (req, res, next) => backend(req, res, next);
+  backendWrapper.getHierarchy = () => backend.hierarchy;
+  module.exports = backendWrapper;
+}