TreeTable: selectionChange emitter type error

[ronozato]

Describe the bug

The type of the selectionChange emitter in the TreeTable component is currently defined as EventEmitter<TreeTableNode<any> | null>. However, specifying it this way leads to a type error and prevents the two-way binding of the selection property from working correctly. The correct type should be EventEmitter<TreeTableNode<any>[] | null>.

In versions up to 15.x, the type of this emitter was EventEmitter<any>, and the sample code binds it to a variable of type TreeNode[]. However, starting from version 16.x, it has been changed to EventEmitter<TreeTableNode<any> | null>, transitioning from an array of objects to a single object. When attempting to pass a value of type TreeTableNode to the [(selection)] property according to this new specification, an error occurs: ERROR TypeError: (this.selection || []) is not iterable. On the other hand, if you modify the PrimeNG source code and specify the type of the selectionChange emitter as EventEmitter<TreeTableNode<any>[] | null>, it works without any issues.

Environment

Ubuntu 22.04.1 LTS (WSL)

Reproducer

No response

Angular version

16.1.2

PrimeNG version

16.0.2

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.15.0

Browser(s)

Chrome 114.0.5735.134

Steps to reproduce the behavior

1. Create a TreeTable component and set the selectionMode to 'checkbox'.
2. Create a property of type TreeTableNode | null in the component class.
3. Bind the value of the previously created property to [(selection)].
4. An error occurs when checking the checkbox.

Expected behavior

No response

[dylansyoung]

When is this bug fix slated to be released?