Node: V8 snapshot not executing

[hydroper]

• Version: v12.14.0
• Platform: Windows 10
• Subsystem: None

What steps will reproduce the bug?

index.js

• 
  
  1. Run node index.js. Traces "Foo".
  
  
• 
  
  1. Run node snapshot.json. This time does not trace "Foo".
  
  

const fs = require("fs")
    , path = require("path")
    , v8 = require("v8")

console.log("Foo")

fs.writeFileSync(path.resolve(__dirname, "snapshot.json"), v8.getHeapSnapshot().read())

How often does it reproduce? Is there a required condition?

No required condition.

What is the expected behavior?

Output:

$ node index.js
< Foo
$ node snapshot.json
< Foo

What do you see instead?

V8 heap snapshot does not execute.

[addaleax]

@Hydroper A heap snapshot is not a runnable representation of a program, it’s basically just a list of all JS objects that exist in memory for debugging purposes.

V8 has another feature that’s called snapshot, but Node.js currently does not support snapshotting userland code (yet).

[bnoordhuis]

Closing as answered.