JavaScript Destructuring with undeclared variables - what is their scope?

If I have this piece of code (which uses destructuring) seems it's creating new variables ss and pp.

But what is the scope of these? Are they created as var or as let variables?
Are they function or block scoped?

let config = {
    server: 'localhost',
    port: '8080',
    timeout: 900,
};
/* no let or var here */ ({server : ss, port : pp} = config); 
console.log(ss, pp);

Answer:1

They're global variables, just like in normal assignments. Your code is just shorthand for:

ss = config.server;
pp = config.port;

Answer:2

They are global. You can even prove this out through slight modification of your example. The console.log statements both work in the following snippet. Both would fail if it was block-scoped, the first would pass but second would fail if it was function-scoped, but clearly both work.

(function() {
  {
    let config = {
        server: 'localhost',
        port: '8080',
        timeout: 900,
    };
    ({server : ss, port : pp} = config); 
  }

  console.log(ss, pp);
})();

console.log(ss, pp);

Answer:3

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