Clean up the oopsie. Rebuild the blank exercises.

node_modules/cross-spawn/lib/util/readShebang.js

@@ -1,37 +1,32 @@
 'use strict';
 
-var fs = require('fs');
-var LRU = require('lru-cache');
-var shebangCommand = require('shebang-command');
-
-var shebangCache = new LRU({ max: 50, maxAge: 30 * 1000 });  // Cache just for 30sec
+const fs = require('fs');
+const shebangCommand = require('shebang-command');
 
 function readShebang(command) {
-    var buffer;
-    var fd;
-    var shebang;
+    // Read the first 150 bytes from the file
+    const size = 150;
+    let buffer;
 
-    // Check if it is in the cache first
-    if (shebangCache.has(command)) {
-        return shebangCache.get(command);
+    if (Buffer.alloc) {
+        // Node.js v4.5+ / v5.10+
+        buffer = Buffer.alloc(size);
+    } else {
+        // Old Node.js API
+        buffer = new Buffer(size);
+        buffer.fill(0); // zero-fill
     }
 
-    // Read the first 150 bytes from the file
-    buffer = new Buffer(150);
+    let fd;
 
     try {
         fd = fs.openSync(command, 'r');
-        fs.readSync(fd, buffer, 0, 150, 0);
+        fs.readSync(fd, buffer, 0, size, 0);
         fs.closeSync(fd);
-    } catch (e) { /* empty */ }
+    } catch (e) { /* Empty */ }
 
     // Attempt to extract shebang (null is returned if not a shebang)
-    shebang = shebangCommand(buffer.toString());
-
-    // Store the shebang in the cache
-    shebangCache.set(command, shebang);
-
-    return shebang;
+    return shebangCommand(buffer.toString());
 }
 
 module.exports = readShebang;