[j178]

Calculate size changes from raw JSON, report the largest symbol changes, and retain complete data for investigation.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-26T10:09:25.897387Z	0c4b1b7	New commits

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.20%. Comparing base (1c8e51a) to head (a167559).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2963      +/-   ##
==========================================
+ Coverage   94.15%   94.20%   +0.04%     
==========================================
  Files         147      147              
  Lines       31160    31109      -51     
==========================================
- Hits        29339    29305      -34     
+ Misses       1821     1804      -17     

☔ View full report in Codecov by Harness.
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• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Build: profiling + self-update (with debug info).

Metric	Base (bytes)	Head (bytes)	Change
.text	12,881,568	12,881,568	+0 (+0.00%)
File	273,020,888	273,021,016	+128 (+0.00%)

Largest symbol changes

Increases

None.

Decreases

None.

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 0 regressions, 2 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1022-azure
• CPU: 4 cores
• prek version: prek 0.5.7+35 (3f51380 2026-10-26)
• Rust version: rustc 1.99.1 (58cf8f9c3 2026-10-13)
• Hyperfine version: hyperfine 2.0.0

CLI Commands

Benchmarking basic commands in the main repo:

prek --version

Command	Mean Wall Time [ms]	Change	Factor
prek-base --version	2.5 ± 0.2
prek-head --version	2.2 ± 0.1	-13.0%

✅ Performance improvement for prek --version: 13.0200% faster

prek list

Command	Mean Wall Time [ms]	Change	Factor
prek-base list	9.9 ± 1.2
prek-head list	9.7 ± 0.4	-2.2%

prek validate-config .pre-commit-config.yaml

⏭️ Skipped: .pre-commit-config.yaml not found

prek sample-config

Command	Mean Wall Time [ms]	Change	Factor
prek-base sample-config	2.8 ± 0.5
prek-head sample-config	2.6 ± 0.2	-8.5%

Cold vs Warm Runs

Comparing first run (cold) vs subsequent runs (warm cache):

prek run --all-files (cold - no cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.7 ± 0.6
prek-head run --all-files	18.2 ± 0.8	-2.4%

prek run --all-files (warm - with cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.5 ± 0.4
prek-head run --all-files	18.6 ± 3.1	+0.8%

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

prek run --all-files (full builtin hook suite)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.5 ± 0.6
prek-head run --all-files	17.8 ± 0.5	-3.4%

Individual Hook Performance

Benchmarking each hook individually on the test repo:

prek run trailing-whitespace --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run trailing-whitespace --all-files	8.8 ± 0.3
prek-head run trailing-whitespace --all-files	8.6 ± 0.3	-3.0%

prek run end-of-file-fixer --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run end-of-file-fixer --all-files	7.9 ± 0.1
prek-head run end-of-file-fixer --all-files	8.0 ± 0.3	+1.1%

prek run check-json --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-json --all-files	7.1 ± 1.1
prek-head run check-json --all-files	7.1 ± 0.6	-0.7%

prek run check-yaml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-yaml --all-files	7.5 ± 0.1
prek-head run check-yaml --all-files	7.0 ± 0.2	-6.5%

prek run check-toml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-toml --all-files	7.0 ± 0.1
prek-head run check-toml --all-files	7.0 ± 0.3	-0.9%

prek run check-xml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-xml --all-files	7.1 ± 0.5
prek-head run check-xml --all-files	6.8 ± 0.1	-4.4%

prek run detect-private-key --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run detect-private-key --all-files	8.3 ± 2.3
prek-head run detect-private-key --all-files	7.1 ± 0.2	-13.8%

✅ Performance improvement for prek run detect-private-key --all-files: 13.7900% faster

prek run fix-byte-order-marker --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run fix-byte-order-marker --all-files	7.5 ± 0.3
prek-head run fix-byte-order-marker --all-files	7.3 ± 0.2	-2.2%

Installation Performance

Benchmarking hook installation (fast path hooks skip Python setup):

prek install-hooks (cold - no cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base install-hooks	4.7 ± 0.1
prek-head install-hooks	4.5 ± 0.0	-3.9%

prek install-hooks (warm - with cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base install-hooks	4.7 ± 0.1
prek-head install-hooks	4.5 ± 0.0	-4.5%

File Filtering/Scoping Performance

Testing different file selection modes:

prek run (staged files only)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run	10.5 ± 0.1
prek-head run	10.5 ± 0.1	+0.1%

prek run --files '*.json' (specific file type)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --files '*.json'	5.3 ± 0.1
prek-head run --files '*.json'	5.2 ± 0.2	-2.2%

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

prek run --dry-run --all-files (measures init overhead)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --dry-run --all-files	7.1 ± 0.2
prek-head run --dry-run --all-files	6.9 ± 0.3	-3.5%

Meta Hooks Performance

Benchmarking meta hooks separately:

prek run check-hooks-apply --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-hooks-apply --all-files	8.4 ± 0.3
prek-head run check-hooks-apply --all-files	8.1 ± 0.2	-4.0%

prek run check-useless-excludes --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-useless-excludes --all-files	8.4 ± 0.3
prek-head run check-useless-excludes --all-files	8.2 ± 0.4	-1.5%

prek run identity --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run identity --all-files	7.1 ± 0.1
prek-head run identity --all-files	7.3 ± 0.4	+1.7%

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