Use of UNSAFE_componentWill* methods

[demonfiddler]

Describe the bug
In an application that uses react-dropdown-tree-select, the browser console routinely shows two error level messages related to the use of the deprecated UNSAFE_componentWillMount() and UNSAFE_componentWillReceiveProps() functions. The messages state: "UNSAFE_componentWill* in strict mode is not recommended and may indicate bugs in your code. See https://react.dev/link/unsafe-component-lifecycles for details. for details."

src/index.js implements function UNSAFE_componentWillMount
src/tree/index.js implements function UNSAFE_componentWillReceiveProps

To Reproduce
The problem should be evident in any application that uses this component.

Expected behavior
The messages suggest fixes:

For UNSAFE_componentWillMount:

• Move code with side effects to componentDidMount, and set initial state in the constructor.

For UNSAFE_componentWillReceiveProps:

• Move data fetching code or side effects to componentDidUpdate.
• If you're updating state whenever props change, refactor your code to use memoization techniques or move it to static getDerivedStateFromProps. Learn more at: https://react.dev/link/derived-state

Screenshots
n/a

Environment:

• Microsoft Edge 139.0.3405.86 (Official build) (64-bit)
• Windows 10 Pro Version 22H2 OS Build 19045.6216
• Node v22.14.0
• Next.js 15.2.4
• React 19.0.0
• pnpm 10.15.0

Additional context
My application, Evidence Engine, uses react-dropdown-tree-select in single-select mode.