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Add blog post about core config move (#2433)

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* Add blog post about core config move

* Update blog/2024-10-31-core-config-moved.md

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* Update blog/2024-10-31-core-config-moved.md

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* Update 2024-10-31-core-config-moved.md

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---
author: Erik Montnemery
authorURL: https://github.com/emontnemery
title: "The core config class has been moved"
---
### Summary of changes
The definition of the core config class, an instance of which is available as [`hass.config`](https://developers.home-assistant.io/docs/dev_101_hass/#the-hass-object) has been moved from `homeassistant/core.py` to `homeassistant/core_config.py`. The move was done to make it easier to read and understand the core code. Custom integrations which currently import `Config` from `homeassistant.core` need to be updated to instead import from `homeassistant.core_config`.
:::info
Normally, integrations won't need to use the core `Config` class. But there's been custom integrations that have incorrect type annotations where the `config` object passed to the integration's `async_setup` is specified as a `Config` instance:
```py
from homeassistant.core import Config
async def async_setup(hass: HomeAssistant, config: Config) -> bool:
"""Set up the integration."""
```
A correct type annotation would be like this:
```py
from homeassistant.helpers.typing import ConfigType
async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
"""Set up the integration."""
```
:::
### Backwards compatibility
Until Home Assistant Core 2025.11, it's possible to import from `homeassistant.core`, and doing so will log a warning asking users to open an issue on the custom integration's bug tracker.