uncut hedge
Hi im not that experienced with TS but im slowly getting the hang of it.
But i currently having an issue where i cant wrap my head around why i'm getting a type error ts(2344). (im using Svelte)
I wrote a generic function that creates a Writable store and extends it with some common methods for data collections (arrays of objects).
// Every DB record has at least a id
interface DBRecord {
id: number
}
// Svelte store with useful methods for array manipulation
interface CollectionStore<T extends DBRecord> extends Writable<T[]> {
insertRecord: (data: T) => void
replaceRecord: (data: T) => void
removeRecord: (id: number) => void
sortRecords: (compareFn?: (a: T, b: T) => number) => void
}
// Creates a extended Writable store
declare function collectionStore<T extends DBRecord>(
value?: T[],
start?: StartStopNotifier<T[]>
): CollectionStore<T>
But now when i use this function, like:
interface Item {
id: number
item: string
}
const itemStore = collectionStore<Item[]>([])
I get the error:
Type 'Item[]' does not satisfy the constraint 'DBRecord'.
Property 'id' is missing in type 'Item[]' but required in type 'DBRecord'.
I dont understand why. I declared the type Item and it has a id property, so why does it complain about not having id?
prime axle