Khan / perseus / 5351238644

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github

TypeScript type fixes (#581)

## Summary:

I found a few type issues while working on a PR. Traced them back and they also exist on `main`, so this fixes them up. 

Issue: "none"

## Test plan:

✅ `yarn; yarn tsc` 
✅ `yarn test`

Author: jeremywiebe

Reviewers: jeremywiebe, nedredmond, SonicScrewdriver, handeyeco, eamspoker

Required Reviewers:

Approved By: nedredmond

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ gerald, ✅ gerald, ✅ finish_coverage, ⏭  Publish npm snapshot, ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/581

7530 of 16317 branches covered (46.15%)

Branch coverage included in aggregate %.

20090 of 45909 relevant lines covered (43.76%)

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