three.js/examples/jsm/nodes/inputs/PropertyNode.js

import { InputNode } from '../core/InputNode.js';

function PropertyNode( object, property, type ) {

	InputNode.call( this, type );

	this.object = object;
	this.property = property;

}

PropertyNode.prototype = Object.create( InputNode.prototype );
PropertyNode.prototype.constructor = PropertyNode;
PropertyNode.prototype.nodeType = 'Property';

Object.defineProperties( PropertyNode.prototype, {

	value: {

		get: function () {

			return this.object[ this.property ];

		},

		set: function ( val ) {

			this.object[ this.property ] = val;

		}

	}

} );

PropertyNode.prototype.toJSON = function ( meta ) {

	var data = this.getJSONNode( meta );

	if ( ! data ) {

		data = this.createJSONNode( meta );

		data.value = this.value;
		data.property = this.property;

	}

	return data;

};

export { PropertyNode };