In another module, I defined a variable in the following manner:
// module1.js
let directory;
export { directory };
Now, I am trying to access it in a separate module like so:
// module2.js
import { directory } from '../js/module1.js';
directory = gui.createFolder( 'User Data' );
Error: Cannot assign to a constant variable.Imports serve as read-only connections to the original variable located in the exporting module. The term "read-only" signifies that direct modifications are not possible. On the other hand, the term "live" indicates that any alterations made by the exporting module can be observed.
In cases where a module needs to permit other modules to adjust the values of its exports (which is typically infrequent), it must export a function intended for that purpose. For example:
alpha.js:
export let folder;
export function setFolder(f) {
folder = f;
}
beta.js:
import { folder, setFolder } from "./alpha.js";
console.log(folder); // The output will be `undefined` unless altered by another module
setFolder(gui.addFolder("Avatar Measurements"));
console.log(folder); // The output will reflect whatever `gui.addFolder` returns
However, it remains highly unusual for a module to allow external modifications to its exports in this manner.
As requested, here is an instance of exporting an object instead:
alpha.js:
export let shapes = {};
beta.js:
import { shapes } from "./alpha.js";
shapes.folder = gui.addFolder("Avatar Measurements");
It is not immediately evident why this object must reside in alpha rather than being local in beta.
The issue arises because when you import folder from ../js/first.js, you are creating a constant named folder. Constants cannot be reassigned, so avoid using == or === as they are comparison operators and won't alter the value of folder.
To transfer data from second.js to first.js, consider exporting a function from second.js. If you opt not to do this, then choose a different variable name, such as folder_ (and make sure to declare it initially with var folder_;).
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