Store item = undefined, causes typescript error

items[item.id] = undefined

items[item.id] = undefined

items[item.id] = undefined

items[item.id] = undefined

throws:

Type 'undefined' is not assignable to type '{ ...<item props> }'.ts(2322)

Type 'undefined' is not assignable to type '{ ...<item props> }'.ts(2322)

Type 'undefined' is not assignable to type '{ ...<item props> }'.ts(2322)

Type 'undefined' is not assignable to type '{ ...<item props> }'.ts(2322)

How to deal with this? I wish to avoid having

undefined

undefined

undefined

undefined as a type:

items: { [key: string]: Item | undefined }

items: { [key: string]: Item | undefined }

items: { [key: string]: Item | undefined }

items: { [key: string]: Item | undefined }