[ Interactive Graph | Vector Graph ] PR5: Editor Support

[SonicScrewdriver]

Summary

This PR was created with the help of AI, albeit with heavy oversight and review.

This is part of a series of PRs implementing the vector graph type for the Interactive Graph widget:

PR1 – type definitions and schema
PR2 – state management
PR3 – rendering & accessibility
PR4 – scoring
▶️ PR5 – editor support (this PR)

Issue: LEMS-3971

• Surfaces the vector graph type in the content-creator UI. Once landed and the feature flag is enabled, content creators can author vector graph exercises.

Changes:

• graph-type-selector.tsx — Adds "Vector" option to the graph type dropdown, gated behind interactive-graph-vector feature flag.
• start-coords/types.ts — Adds {type: "vector"} to GraphTypesThatHaveStartCoords union.
• start-coords/util.ts — Imports getVectorCoords and adds case "vector" in getDefaultGraphStartCoords.
• start-coords/start-coords-settings.tsx — Adds case "vector" dispatching to <StartCoordsLine> (reuses the existing component since vector has the same CollinearTuple shape as ray/linear).
• interactive-graph-question-builder.ts — Adds withVector() builder method and VectorGraphConfig class to the editor's test data builder.
• testdata/interactive-graph.testdata.ts — Adds vectorMinimalQuestion test fixture for the editor story.
• interactive-graph-editor.stories.tsx — Adds InteractiveGraphVector editor Storybook story.

Design decisions:

• No editor validation for overlapping start coords — Consistent with ray, linear, and segment which also don't validate for overlapping points in the editor. The reducer already rejects moves that would cause overlap during interaction.
• Reuses StartCoordsLine — Vector's CollinearTuple start coords shape matches ray/linear, so no custom start coords component is needed (unlike exponential which has an asymptote field).

Test plan:

• pnpm tsc — no new type errors
• pnpm lint — no lint errors
• Verified in Storybook: editor correctly shows vector graph type when feature flag is enabled, start coords UI works
• No existing tests regress

[github-actions]

🗄️ Schema Change: No Changes ✅

[github-actions]

🛠️ Item Splitting: No Changes ✅

[github-actions]

Size Change: +61 B (+0.01%)

Total Size: 496 kB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	101 kB	+61 B (+0.06%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	20.5 kB
packages/keypad-context/dist/es/index.js	1 kB
packages/kmath/dist/es/index.js	6.21 kB
packages/math-input/dist/es/index.js	98.5 kB
packages/math-input/dist/es/strings.js	1.61 kB
packages/perseus-core/dist/es/index.item-splitting.js	11.9 kB
packages/perseus-core/dist/es/index.js	25.1 kB
packages/perseus-linter/dist/es/index.js	9.3 kB
packages/perseus-score/dist/es/index.js	9.69 kB
packages/perseus-utils/dist/es/index.js	403 B
packages/perseus/dist/es/index.js	194 kB
packages/perseus/dist/es/strings.js	8.28 kB
packages/pure-markdown/dist/es/index.js	1.39 kB
packages/simple-markdown/dist/es/index.js	6.71 kB

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (506e43b) and published it to npm. You
can install it using the tag PR3443.

Example:

pnpm add @khanacademy/perseus@PR3443

If you are working in Khan Academy's frontend, you can run the below command.

./dev/tools/bump_perseus_version.ts -t PR3443

If you are working in Khan Academy's webapp, you can run the below command.

./dev/tools/bump_perseus_version.js -t PR3443