Apply consistent, type-safe idioms and keep logic/formatting easy to scan.

• Prefer the established guard/pattern style:

  // preferred if the surrounding code uses boolean guards
  theme && devtools.setTheme(theme)
  

• Remove redundant casts like as any when TypeScript can infer/narrow:

  const options = query.options // avoid unnecessary `as any`
  

• Extract and reuse common “value or function” handling instead of repeating typeof ... === 'function' checks; use shared helpers (e.g., a resolveValueOrFunction utility) across the codebase.
• Keep control flow structured: avoid duplicated assignments/notifications and hard-to-follow early returns. Split logic by the primary conditions (e.g., index change vs result change), then assign/notify accordingly.
• Enforce consistent formatting/import conventions (grouping, ordering, quote style) to reduce diff noise and improve readability.

Use these guidelines to guide refactors during reviews, not only new code.