Cloning copies prototype properties onto the object

function Test () {}
Test.prototype.val = 42;

console.log(klona(new Test())); // { val: 42 }
console.log(klona(new Test()).__proto__); // {}

[lukeed]

Hey @evilebottnawi – I’m not sure what you’re switching from, but I’m guessing it’s clone-deep. Since you said it’s a blocker, I just wanted to let you know that clone-deep never actually clones a custom class instance unless you explicitly tell it to. By default, it returned the original instance. Only lodash – and now klona – return a new fresh instance of the custom class by default.

You can see this here:

const clone = require('clone-deep');
const klona = require('klona');

function Test () {}
Test.prototype.val = 42;

function run(name, lib) {
	let input = new Test();
	let output = lib(input);

	console.log('[%s] before:', name, output.val);
	input.val++; // modify source
	console.log('[%s] after:', name, output.val);
}

run('clone-deep', clone);
run('clone-deep (instance)', foo => clone(foo, true));
run('klona', klona);

//=> [clone-deep] before: 42
//=> [clone-deep] after: 43
//=> [clone-deep (instance)] before: 42
//=> [clone-deep (instance)] after: 42
//=> [klona] before: 42
//=> [klona] after: 42

[alexander-akait]

@lukeed can we fix it? Blocker for fully migrate on klona