Don't build the extension in pre-commit envs

hatch_build.py

@@ -0,0 +1,34 @@
+import os
+import sys
+from typing import Any
+
+from hatch_jupyter_builder.plugin import JupyterBuildHook, _get_log
+
+
+class CustomBuildHook(JupyterBuildHook):
+    """
+    We use a custom build hook to detect pre-commit environments. In those
+    environments there is no need to build the extension (and, in addition
+    the build will fail if npm is not available, which is often the case
+    of pre-commit environments).
+    """
+
+    def initialize(self, version: str, _: dict[str, Any]) -> None:
+        log = _get_log()
+        log.info(
+            "Preparing the build of the JupyterLab extension for Jupytext "
+            f"in this environment: {sys.executable}"
+        )
+        if "/.cache/pre-commit/".replace("/", os.path.sep) in sys.executable:
+            log.info(
+                "This environment looks like a pre-commit environment. "
+                "Skipping the build of the extension"
+            )
+            self._skipped = True
+            return
+
+        return super().initialize(version=version, _=_)
+
+
+# hatch wants a single hook
+del JupyterBuildHook

pyproject.toml

@@ -130,14 +130,14 @@ packages = ["src/jupytext", "src/jupytext_config", "jupyterlab/jupyterlab_jupyte
 "jupyterlab/jupyter-config" = "etc/jupyter"
 "jupyterlab/jupyterlab_jupytext/labextension" = "share/jupyter/labextensions/jupyterlab-jupytext"
 
-[tool.hatch.build.hooks.jupyter-builder]
+[tool.hatch.build.hooks.custom]
 # Enable running hook by default.
 # We disable this hook only by setting env var HATCH_BUILD_HOOKS_ENABLE=false
 # So `HATCH_BUILD_HOOKS_ENABLE=false pip install .` will **not** build JupyterLab related
 # extension. A simple `pip install .` will **always** build extension
 enable-by-default = true
 # Runtime dependency for this build hook
-# We need jupyterlab as build time depdendency to get jlpm (wrapper around yarn)
+# We need jupyterlab as build time dependency to get jlpm (wrapper around yarn)
 dependencies = [
     "hatch-jupyter-builder>=0.5", "jupyterlab>=4"
 ]