Allow to clone expressions

[viceice]

We currently do some parallel queries and those use some general expressions.
We can't simply reuse them, we need to clone them.
One workaround is to use lodash.deepClone, but i want to get rid of that library.
So for now i always need to recreate the partial expressionen for every query.

sample

import caml from 'camljs';

const w1 = new caml().View(['ID']).Query().Where();
const w2 = new caml().View(['ID']).Query().Where();
const expr = [caml.Expression().IntegerField('FSObjType').EqualTo(1)];

const q1 = w1.All(expr);
const q2 = w2.All(expr);

console.assert(q1.get_viewXml() === q2.get_viewXml(), "Error: query mismatch");

[andrei-markeev]

I tested a bit and if I create an expression, I can reuse it to create multiple other queries without any issues.

The example you provided, well it doesn't work because there's no get_viewXml method on the CamlBuilder object, but if I use ToString(), it works fine.

Can you provide a different example or improve this one so that it can be used to reproduce the problem? 🙏

[viceice]

sorry, will check again. forgot the toCamlQuery call 😅