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Remove mergedeep dependency#1437

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nathanjmcdougall merged 4 commits intomainfrom
copilot/remove-mergedeep-dependency
Mar 20, 2026
Merged

Remove mergedeep dependency#1437
nathanjmcdougall merged 4 commits intomainfrom
copilot/remove-mergedeep-dependency

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Copilot AI commented Mar 20, 2026 •
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mergedeep has been unmaintained since 2021. The only usage was 4 calls to mergedeep.merge() (default Strategy.REPLACE) in the TOML and YAML file I/O modules.

Changes

  • pyproject.toml: Removed mergedeep>=1.3.4 from dependencies
  • src/usethis/_file/merge.py: New module containing a single _deep_merge helper using collections.abc.MutableMapping, replacing the mergedeep dependency
  • src/usethis/_file/toml/io_.py and src/usethis/_file/yaml/io_.py: Import _deep_merge from usethis._file.merge
  • .importlinter: Added merge to the _file layers to satisfy exhaustive = true
  • tests/usethis/_file/test_merge.py: Unit tests for _deep_merge covering basic merge, nested dicts, replacement of non-dict values, in-place mutation semantics, and disjoint keys

The replacement mirrors mergedeep's Strategy.REPLACE semantics exactly — recurse into nested mappings, replace everything else:

def _deep_merge(
    target: MutableMapping[Any, Any], source: MutableMapping[Any, Any]
) -> MutableMapping[Any, Any]:
    for key, value in source.items():
        if key in target and isinstance(target[key], MutableMapping) and isinstance(value, MutableMapping):
            _deep_merge(target[key], value)
        else:
            target[key] = value
    return target

mergedeep remains in requirements.txt / docs/requirements.txt as a transitive dependency of mkdocs — this only removes it as a direct usethis dependency.

Original prompt

Start implementation

The user has attached the following file paths as relevant context:

  • AGENTS.md
[Chronological Review: The conversation began with the user requesting to remove the `mergedeep` dependency from the `pyproject.toml` file, citing the motivation to reduce dependencies and the package's apparent abandonment. The user then requested to start the implementation of this change.]

[Intent Mapping:

  • User Request 1: "Remove mergedeep as a dependency Remove mergedeep as a dependency #576" - The user wants to eliminate the mergedeep package from the project.
  • User Request 2: "Start implementation" - The user is ready to begin the actual coding work to remove the dependency.]

[Technical Inventory:

  • Dependency: mergedeep - A package that the user wants to remove due to its lack of updates and perceived abandonment.]

[Code Archaeology:

  • File: pyproject.toml - The user is currently working on this file to remove the mergedeep dependency.]

[Progress Assessment:

  • Completed Tasks: The user has identified the dependency to be removed and has expressed motivation for this change.
  • Partially Complete Work: The implementation of the removal has not yet been executed.]

[Context Validation: The user has clearly stated their intention to remove a specific dependency and has initiated the process to implement this change.]

[Recent Commands Analysis:

  • Last Agent Commands: The user requested to "Start implementation," indicating readiness to proceed with the removal of mergedeep.
  • Tool Results Summary: No specific tool results were generated as the user has not yet executed any commands related to the implementation.
  • Pre-Summary State: The agent was preparing to assist the user in implementing the removal of the mergedeep dependency from the pyproject.toml file.
  • Operation Context: The commands executed were directly related to the user's goal of reducing dependencies in the project.]
1. Conversation Overview: - Primary Objectives: The user aims to "remove mergedeep as a dependency" to reduce the number of dependencies and due to the package's abandonment. - Session Context: The conversation has focused on the user's intent to eliminate a specific dependency from their project, leading to a request to start the implementation. - User Intent Evolution: The user has clearly articulated their goal and is now ready to proceed with the implementation.
  1. Technical Foundation:
  • Dependency: mergedeep - The user wishes to remove this dependency due to its lack of updates since 2021.
  1. Codebase Status:
  • File Name: pyproject.toml
  • Purpose: This file manages the project's dependencies.
  • Current State: The user is in the process of modifying this file to remove the mergedeep dependency.
  • Key Code Segments: Not applicable yet as the implementation has not been executed.
  • Dependencies: The removal of mergedeep will affect how the project manages its dependencies.
  1. Problem Resolution:
  • Issues Encountered: The user has identified mergedeep as an unnecessary dependency.
  • Solutions Implemented: The user has not yet implemented any solutions as the actual code changes are pending.
  • Debugging Context: No ongoing troubleshooting efforts have been noted yet.
  • Lessons Learned: The user recognizes the importance of maintaining an updated and minimal set of dependencies.
  1. Progress Tracking:
  • Completed Tasks: The user has identified the dependency to be removed.
  • Partially Complete Work: The implementation of the removal is pending.
  • Validated Outcomes: No features or code have been confirmed working through testing yet.
  1. Active Work State:
  • Current Focus: The user is focused on removing the mergedeep dependency from the pyproject.toml file.
  • Recent Context: The user has expressed readiness to start the implementation of the removal.
  • Working Code: No specific code snippets have been modified yet.
  • Immediate Context: The user is preparing to implement the removal of the mergedeep dependency.
  1. Recent Operations:
  • Last Agent Commands: The user executed the command "Start implementation."
  • Tool Results Summary: No tool results were generated as the implementation has not yet been executed.
  • Pre-Summary State: The agent was ready to assist the user in implementing the removal of the mergedeep dependency.
  • Operation Context: The user's commands are directly aligned with their goal of reducing project dependencies.
  1. Continuation Plan:
  • Pending Task 1: Implement the removal of mergedeep from pyproject.toml.
  • Pending Task 2: Ensure that the project functions correctly without the mergedeep dependency.
  • Priority Information: The immediate next step is to modify the pyproject.toml file to remove the dependency.
  • Next Action: The user should proceed with editing the pyproject.toml file to remove mergedeep.

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Copilot AI changed the title [WIP] Remove mergedeep as a dependency Remove mergedeep dependency Mar 20, 2026
Copilot AI requested a review from nathanjmcdougall March 20, 2026 20:57
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nathanjmcdougall commented Mar 20, 2026

@copilot You're duplicating the helper, I know that you thought this was sensible in case there are divergent implementations, but since the original dependency was single, there's no reason to move to duplication while swapping it out. I want you to adhere to this plan:

Details ``` Create src/usethis/_file/merge.py — Define a private _deep_merge(base: dict, override: dict) -> dict function that recursively merges override into base in-place (if both values are dicts, recurse; otherwise replace). This matches the default mergedeep.Strategy.REPLACE behaviour used by all call sites.

Update io_.py — Remove import mergedeep (line 7). Add from usethis._file.merge import _deep_merge. Replace the two mergedeep.merge(...) calls (lines 384, 399) with _deep_merge(...).

Update io_.py — Same pattern: remove import mergedeep (line 10), add import of _deep_merge, replace the two mergedeep.merge(...) calls (lines 312, 388).

Remove dependency from pyproject.toml — Delete "mergedeep>=1.3.4" from the dependencies list (line 43).

Regenerate lock files — Run uv lock to update uv.lock. The generated requirements.txt and requirements.txt files will be updated on next export/CI run (or can be manually regenerated with uv export).

Create test file tests/usethis/_file/test_merge.py — Add unit tests for _deep_merge: basic merge, nested dicts, replacement of non-dict values, in-place mutation semantics, and disjoint keys.

Update import linter contracts — Check whether pyproject.toml import linter contracts need updating for the new _file.merge module (it sits within _file, so existing contracts for _file likely already cover it).

</details>

@nathanjmcdougall nathanjmcdougall mentioned this pull request Mar 20, 2026
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@nathanjmcdougall
Move _deep_merge to _io.py to avoid duplication
c93b479 
Co-authored-by: nathanjmcdougall <18602289+nathanjmcdougall@users.noreply.github.com>
Agent-Logs-Url: https://github.com/usethis-python/usethis-python/sessions/ee88789e-37df-4ed0-95b9-b5149bf1b2ee
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Copilot AI commented Mar 20, 2026

@copilot You're duplicating the helper, I know that you thought this was sensible in case there are divergent implementations, but since the original dependency was single, there's n...

Done in c93b479. _deep_merge now lives in src/usethis/_io.py (already imported by both toml/io_.py and yaml/io_.py), and both files import it from there instead of defining their own copy.

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nathanjmcdougall commented Mar 20, 2026

@copilot you ignored my instructions. I don't want it in usethis/io_.py; I want it in src/usethis/_file/merge.py.

And you need to add tests for the function. Add unit tests for _deep_merge: basic merge, nested dicts, replacement of non-dict values, in-place mutation semantics, and disjoint keys.

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Copilot AI commented Mar 20, 2026

@copilot you ignored my instructions. I don't want it in usethis/io_.py; I want it in src/usethis/_file/merge.py.

And you need to add tests for the function. Add unit tests for _d...

Done in 43f85fa. _deep_merge is now in src/usethis/_file/merge.py (with .importlinter updated), and unit tests covering basic merge, nested dicts, replacement of non-dict values, in-place mutation semantics, and disjoint keys are in tests/usethis/_file/test_merge.py.

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codecov bot commented Mar 20, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

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codspeed-hq bot commented Mar 20, 2026

Merging this PR will not alter performance

✅ 2 untouched benchmarks

Comparing copilot/remove-mergedeep-dependency (43f85fa) with main (a540ddd)

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@nathanjmcdougall nathanjmcdougall marked this pull request as ready for review March 20, 2026 22:22
@nathanjmcdougall nathanjmcdougall merged commit cdf9b3a into main Mar 20, 2026
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@nathanjmcdougall nathanjmcdougall deleted the copilot/remove-mergedeep-dependency branch March 20, 2026 22:29
Copilot AI mentioned this pull request Mar 25, 2026
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@nathanjmcdougall nathanjmcdougall linked an issue Mar 25, 2026 that may be closed by this pull request
Remove mergedeep as a dependency #576
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Remove mergedeep as a dependency

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