Add module mixins example

tshemsedinov · tshemsedinov · commit f3289f0a4db0 · 2023-06-21T23:51:24.000+03:00
diff --git a/NodeJS/1-mixin/main.js b/NodeJS/1-mixin/main.js
@@ -0,0 +1,4 @@
+'use strict';
+
+require('./unit1.js');
+require('./unit2.js');
diff --git a/NodeJS/1-mixin/unit1.js b/NodeJS/1-mixin/unit1.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const fs = require('node:fs');
+
+const { readFile } = fs;
+
+fs.readFile = (fileName, callback) => {
+  fs.readFile.calls++;
+  readFile(fileName, (error, data) => {
+    fs.readFile.callbacks++;
+    callback(error, data);
+  });
+};
+
+fs.readFile.calls = 0;
+fs.readFile.callbacks = 0;
diff --git a/NodeJS/1-mixin/unit2.js b/NodeJS/1-mixin/unit2.js
@@ -0,0 +1,13 @@
+'use strict';
+
+const fs = require('node:fs');
+
+fs.readFile('./main.js', (error, data) => {
+  const { calls, callbacks } = fs.readFile;
+  fs.readFile.callbacks = 0;
+  if (error) {
+    console.log({ error, calls, callbacks });
+  } else {
+    console.log({ data, calls, callbacks });
+  }
+});
