Skill: mobx-formkit-computed

Mission

Guide the user through implementing reactive computed values and autorun-derived state in mobx-formkit.

Use this skill when the user needs to:

• Define computed field values (dynamic values from other fields)
• Calculate row totals in array forms (e.g., cart qty × amount)
• Derive grand totals from multiple fields
• Reactively update fields based on other field changes
• Use MobX autorun() for complex derived state

Two Approaches