Object

A WeakRef object lets you hold a weak reference to another object, without preventing that object from getting garbage-collected.

• CATEGORY: D2
• FEATURE vs INTERNAL API: API
• INPUT SANITIZERS: NO
• SOURCES AND SINKS: NO
• NEGATIVE TEST CASES: NO
• CODE:

class Counter {
    constructor(element) {
      this.ref = new WeakRef(element);
    }
}

const parsed = route.parse(req.url);
const query  = querystring.parse(parsed.query);
//WeakRef needs an object
let b = [query.name];
let c = new Counter(b); 

res.writeHead(200, {"Content-Type" : "text/html"});
// Get the element from the weak reference, if it still exists
let v = c.ref.deref();
res.write(v[0]);
res.end();

• MEASUREMENT:

• DISCOVERY:

Ideal discovery rule:

Implementation:

Based on Abstract Syntax Tree (AST) and Babel parser to generate and traverse it.

**Discovery Difficulty Level: **

• PRECONDITIONS: 1.
• TRANSFORMATION: developer intervention