<ul><li>When developing a web app with Laravel 12, Inertia.js, React.js, and TypeScript, a TypeScript error occurred when using useForm from Inertia.</li><li>Changing the interface to a type fixed the issue of the index signature compatibility error.</li><li>Interfaces in TypeScript do not allow excess properties unless an index signature is explicitly declared, while types are more flexible for dynamic key access.</li><li>The author hopes this solution helps others facing similar challenges with Inertia and TypeScript.</li></ul>

🔧 Fixing “Index Signature” Errors in Inertia's useForm with TypeScript

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