kokopu/doc_src/migration.md

A JavaScript/TypeScript library implementing the chess game rules and providing tools to read/write the standard chess file formats.

---
title: Migration guides
children:
  - ./migration/migrate_to_3.md
  - ./migration/migrate_to_4.md
---


Migration guides
================

Versions 3.0.0 and 4.0.0 introduce some breaking changes with regard to the previous versions.
To determine whether your codebase needs to be adapted or not when upgrading Kokopu,
please look at:
- [Migration guide to 4.x](migration/migrate_to_4.md) to upgrade from 3.x to 4.0.0 (or any subsequent version).
- [Migration guide to 3.x](migration/migrate_to_3.md) and [migration guide to 4.x](migration/migrate_to_4.md) to upgrade
from 1.x or 2.x to 4.0.0 (or any subsequent version).