Update the development instructions

mwouts · Nov 9, 2023 · cd2f9aa · cd2f9aa
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diff --git a/docs/developing.md b/docs/developing.md
@@ -26,7 +26,7 @@ conda activate jupytext-dev
 
 Install the `jupytext` package in development mode with
 ```
-pip install '.[dev]'
+pip install -e '.[dev]'
 ```
 
 We use the [pre-commit](https://pre-commit.com) package to run pre-commit scripts like `black` and `ruff` on the code.
@@ -45,15 +45,6 @@ Some tests require a Jupyter kernel pointing to the current environment:
 python -m ipykernel install --name jupytext-dev --user
 ```
 
-Finally, you can build the package and install it with
-```
-pip install -U build wheel
-python -m build
-pip install dist/jupytext-x.x.x-py3-none-any.whl
-```
-
-Note that you can use `HATCH_BUILD_HOOKS_ENABLE=false` if you don't need the lab extension - the build time will be slightly shorter.
-
 ## Jupytext's extension for JupyterLab
 
 Our extension for JupyterLab adds a series of Jupytext commands to JupyterLab. The code is in `packages/labextension`. See the `README.md` there for instructions on how to develop that extension.

diff --git a/jupyterlab/packages/jupyterlab-jupytext-extension/README.md b/jupyterlab/packages/jupyterlab-jupytext-extension/README.md
@@ -13,26 +13,25 @@ Most users do not need to install this extension, since it is already included i
 
 Please install [Jupytext](https://github.com/mwouts/jupytext/blob/main/README.md#Install) first. As mentioned above, both the `pip` and `conda` packages do include the latest version of the JupyterLab extension, so in most cases you don't need to specifically install this `npm` package.
 
-In case you're not using JupyterLab 3.x, you will have to install an older version of the extension that is compatible with your version. Please first install `jupytext` using `pip` or `conda`, and then downgrade the extension to a version compatible with your version of Jupyter Lab with:
+In case you're not using JupyterLab 4.x, you will have to install an older version of the extension that is compatible with your version. Please first install `jupytext` using `pip` or `conda`, and then downgrade the extension to a version compatible with your version of Jupyter Lab with:
 
 ```bash
+jupyter labextension install [email protected]  # for JupyterLab 3.x
 jupyter labextension install [email protected]  # for JupyterLab 2.x
 jupyter labextension install [email protected]  # for JupyterLab 1.x
 ```
 
 # How to develop this extension
 
-We assume that you have activated the conda environment described in [CONTRIBUTING.md](https://github.com/mwouts/jupytext/blob/main/CONTRIBUTING.md).
-
-Then you can rebuild the Jupytext python package (with `python -m build`) and reinstall it (`pip install dist/jupytext-x.x.x-py3-none-any.whl`).
-
-Alternatively, if you prefer to develop iteratively, you could install a development version of the extension with
+Please follow the instructions at [developing.md](../../../docs/developing.md), i.e.
+create a Python environment with a recent version of `nodejs`, and install
+a development version of Jupytext by running
 
 ```bash
-jupyter labextension develop . --overwrite
+pip install -e '.[dev]'
 ```
 
-Read more on this on the [JupyterLab documentation](https://jupyterlab.readthedocs.io/en/latest/extension/extension_dev.html#developing-a-prebuilt-extension).
+at the root of the Jupytext repository.
 
 # How to publish a new version of the extension on npm