[Fix] add a few jsdoc type annotations to work around TS inference bugs for consumers #3695
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Figured I'd split this out of #3694
This PR adds a few JSDoc type annotations to hint to TS what the types are. This helps work-around issues like typescript-eslint/typescript-eslint#8522 / microsoft/TypeScript#57460 where TS would infer the wrong type from the JS and would break strictly-typed config files.