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k1w1 avatar k1w1 commented on May 19, 2024

Here is a jsfiddle that demonstrates the desired behavior.

import { observable, observe } from 'https://unpkg.com/@nx-js/[email protected]/dist/es.es6.js';

const obj1 = {
  name: "My complex object",
  subObj: { val: 1 },
}
const obj2= {
  name: "Second complex object",
  subObj: { val: 2 },
}
const state = observable({
  currentObject: null,
});

observe(() => console.log(`${state.currentObject?.name}`));

console.log("Start observing:")

// Should log
state.currentObject = obj1;

// Should log
state.currentObject = obj2;

// Should not log - we only want to observe changes to state.currentObject, but not changes inside state.currentObject.
state.currentObject.name = 'Very complex object';

I imagine an API like:

// Don't observe changes inside `obj1`
state.currentObject = notObservable(obj1);

that does not observe inside obj1.

A trivial implementation would be to have notObservable add a new property to the object, like __DONT_OBSERVE and then in observable(), ignore objects with that property. In the same way that shouldInstrument is used.

from observer-util.

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