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Summary of Changes

Hello @Aarebecca, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily addresses issues related to ESM module resolution and updates the internal CSS parsing mechanism. It introduces a new build step to automatically correct relative import paths in ESM bundles, which is crucial for Node.js compatibility. Additionally, it refactors the font parsing utility to use postcss, replacing an older css parsing library for better reliability and maintainability.

Highlights

  • ESM Import Resolution Fix: A new script (scripts/patch-esm-extensions.mjs) has been introduced to automatically append .js extensions to relative import specifiers in the generated ESM output, ensuring proper module resolution in Node.js environments. This script also creates a package.json file in the esm directory to explicitly mark it as an ESM module.
  • CSS Parsing Library Migration: The internal CSS parsing logic in src/exporter/font.ts has been migrated from the css package to postcss. This change improves the robustness and maintainability of CSS @font-face rule parsing.
  • Build Process Update: The build:esm script in package.json has been updated to include a post-processing step that executes the new ESM patching script after TypeScript compilation, ensuring all ESM bundles are correctly formatted for module resolution.
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Code Review

This pull request effectively addresses the ESM import issue by introducing a post-build script to add .js extensions to relative imports, which is a common and valid approach for TypeScript projects targeting ESM. Additionally, the switch from the css package to postcss for parsing font stylesheets is a great improvement, making the code more robust and modern. I have one suggestion to enhance the new script for better code clarity and robustness.

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codecov-commenter commented Jan 19, 2026

Codecov Report

❌ Patch coverage is 11.11111% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.73%. Comparing base (3fcc360) to head (5d28629).
⚠️ Report is 1 commits behind head on main.

Files with missing lines Patch % Lines
src/exporter/font.ts 5.88% 16 Missing ⚠️
Additional details and impacted files

Impacted file tree graph

@@           Coverage Diff           @@
##             main     #172   +/-   ##
=======================================
  Coverage   44.73%   44.73%           
=======================================
  Files         330      330           
  Lines       26286    26281    -5     
  Branches     2047     2047           
=======================================
  Hits        11758    11758           
+ Misses      14518    14513    -5     
  Partials       10       10           
Flag Coverage Δ
infographic 44.73% <11.11%> (+<0.01%) ⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines Coverage Δ
src/version.ts 100.00% <100.00%> (ø)
src/exporter/font.ts 23.86% <5.88%> (+0.65%) ⬆️
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@Aarebecca
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/gemini review

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Code Review

This pull request aims to fix ESM import path issues by introducing tsc-alias to the build process, which is a solid approach. The changes also involve migrating from the css package to postcss for parsing font stylesheets, which is a good improvement. Overall, the changes are logical and address the intended issue. I've found one potential issue in package.json regarding cross-platform compatibility of a build script and provided a suggestion to make it more robust.

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
@Aarebecca Aarebecca merged commit a6b5820 into main Jan 19, 2026
3 checks passed
@Aarebecca Aarebecca deleted the fix/esm branch January 19, 2026 07:26
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Successfully merging this pull request may close these issues.

The build artifacts are not standardized and do not conform to the Node.js ESM import specifications.

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