In my component, I have this element
One of its attributes has a specific format
interface IItem {
itemName: string
itemNumber: string
barcode: string
}
data = {
date: [],
items: [],
format: 1,
category: null,
selected_item: Array<IItem>
}
However, I believe that this approach to defining types is not entirely accurate
As a result, I am encountering an issue,
https://i.sstatic.net/47LX4.png
So, how can I properly specify the type for these object properties?
Typically, you achieve this by creating a type (such as your IProduct) for the entire object and then assigning that type to the variable that references the object (form) during declaration. For example:
interface FormType {
date: Array<something>;
R20s: Array<something>;
type: number;
cats: null | something;
selected_product: Array<IProduct>;
}
// ...
const form: FormType = {
// ^^^^^^^^^^−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− indicating type of object
date: [],
R2Os: [],
type: 1,
cats: null,
selected_product: [],
// ^^−−−−−−−−−−−−−−−−−−−−−−−− value
};
Alternatively, you can use inline type assertion like this:
const form = {
date: [],
R2Os: [],
type: 1,
cats: null,
// vv−−−−−−−−−−−−−−−−−−−−−−−− value
selected_product: [] as Array<IProduct>,
// ^^^^^^^^^^^^^^^^^^^−−−−−− type assertion
};
The TypeScript handbook is definitely worth reading cover to cover. It provides a concise overview of all the fundamentals.
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