[#94] Backend

https://project.mdnd-it.cc/work_packages/94

SerpentRace_Backend/node_modules/stream-chain/utils/gen.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const {Transform} = require('stream');
+const {next} = require('./asGen');
+const {sanitize} = require('../index');
+
+const gen = (...fns) => {
+  fns = fns.filter(fn => fn);
+  return fns.length
+    ? new Transform({
+        writableObjectMode: true,
+        readableObjectMode: true,
+        transform(chunk, encoding, callback) {
+          (async () => {
+            for await (let value of next(chunk, fns, 0)) {
+              sanitize(value, this);
+            }
+          })().then(() => callback(null), error => callback(error));
+        }
+      })
+    : null;
+};
+
+module.exports = gen;