SvelteKit superforms in SSG mode gives TypeScript error for data.form. Where’s my `form`?
If you’re using SvelteKit with superforms in SSG (Static Site Generation) mode, you may have encountered a TypeScript error related to accessing the `form` property on your data object. This error occurs because the Svelte compiler is unable to infer the type of the `form` property when using SSG.
Fortunately, there are a couple of solutions to this problem.
Solution 1: Type Assertion
The first solution involves using a type assertion to explicitly tell TypeScript the type of the `form` property. This can be done by using the `as` keyword followed by the desired type.
// Assuming your data object looks like this
let data = {
form: {
// form properties
}
};
// Type assertion
let form = data.form as YourFormType;
Replace `YourFormType` with the actual type of your form object. This will inform TypeScript about the type of the `form` property and resolve the error.
Solution 2: Optional Chaining
The second solution involves using optional chaining to access the `form` property. Optional chaining allows you to safely access nested properties even if they are potentially undefined.
// Assuming your data object looks like this
let data = {
form: {
// form properties
}
};
// Optional chaining
let form = data.form?.yourProperty;
In this example, replace `yourProperty` with the actual property you want to access from the `form` object. The optional chaining operator (`?.`) will ensure that the code doesn’t throw an error if the `form` property is undefined.
Conclusion
By using either type assertion or optional chaining, you can resolve the TypeScript error related to accessing the `form` property in SvelteKit superforms while in SSG mode. Choose the solution that best fits your use case and enjoy a smooth development experience with TypeScript and SvelteKit!
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