`installer = "uv"` with `locked = true` uninstalls the editable root project (`dev-mode = true`)

Author: sentiasmCreated Aug 10, 2026Updated Aug 10, 2026

Description

When I make an environment configured with

toml

locked = true
installer = "uv"
dev-mode = true  # the default

hatch==1.17.1 installs the root project in editable mode, but then applies the lockfile using uv pip sync so my environment doesn't have the project installed.

Reproduction

Make a minimal project

bash

mkdir -p my_project/src/my_library
touch my_project/src/my_library/__init__.py
cd my_project

Make a minimal pyproject.toml at the project root:

toml

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[project]
name = "my-library"
version = "0.0.1"

[tool.hatch.envs.test]
installer = "uv"
locked = true
dev-mode = true
dependencies = ["pytest"]

bash

hatch run test:python -c "import my_library"

Expected: No error
Actual: Error indicating my_library is not installed in test environment

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'my_library'

I think this might be because of the order hatch syncs and installs the editable project.

I used python 3.12 with the latest versions of hatch and uv

hatch==1.17.1
uv==0.12.3

Source: pypa/hatch

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