[david-yz-liu]

Proposed Changes

Pulls the self-contained, non-stateful pieces of Graph.js out into their own files and converts them to TypeScript, as prep for eventually converting Graph.js itself. No behavior changes.

• loadGraphData.ts — the fetch-response parsing logic from getGraph()
• util.ts — populateHybridRelatives, findRelationship, numCredits, transformPoint, and formatTransform (all pure functions already)
• requirementParser.ts — moved from js/util/util.ts into the graph component directory
• Made GraphNodeJSON.id_ required instead of optional, which lets Node.tsx, util.ts, and loadGraphData.ts drop their & { id_: string } workaround
• Minor docstring and explicit-parameter-type cleanup in util.ts/loadGraphData.ts

One TypeScript wrinkle: .flat(Infinity) on the recursive PrereqTree type blew up the compiler ("type instantiation is excessively deep"), a known limitation with self-referential array types in .flat()'s typing. Worked around by casting through unknown[] before flattening — no behavior change.

Screenshots of your changes (if applicable)

Not applicable — no UI changes.

Type of Change

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)	X
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
  • Not applicable here — pure refactor, existing tests cover the extracted logic (plus one new type guarantee verified by the existing Bool snapshot).
• I have updated the project documentation, if applicable.
  • This is required for new features.
  • Not applicable — no new features.
• If this is my first contribution, I have added myself to the list of contributors.
  • Not applicable.
• I have updated the project Changelog (this is required for all changes).

After opening your pull request:

• I have verified that the CI checks have passed.
• I have reviewed the test coverage changes reported by Coveralls.
• I have requested a review from a project maintainer.

Questions and Comments

None.

🤖 Generated with Claude Code

[coveralls]

Coverage Report for CI Build 40495193109

Coverage decreased (-0.04%) to 60.339%

Details

• Coverage decreased (-0.04%) from the base build.
• Patch coverage: 11 uncovered changes across 3 files (111 of 122 lines covered, 90.98%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
js/components/graph/loadGraphData.ts	91	85	93.41%
js/components/graph/util.ts	26	22	84.62%
js/components/graph/Graph.js	5	4	80.0%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	4304
Covered Lines:	2655
Line Coverage:	61.69%
Relevant Branches:	1001
Covered Branches:	546
Branch Coverage:	54.55%
Branches in Coverage %:	Yes
Coverage Strength:	156.91 hits per line

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💛 - Coveralls