My selection includes:
export type DocumentType =
| Item
| List
| User
export type DocumentInputType =
| ItemInputType
| ListInputType
| UserInputType
I want to develop a feature that can determine the input type based on the document type without requiring an additional generic parameter. Is this feasible?
type Documents<DocType extends DocumentType> = {
data: DocType[]
createDocument: (input: <<This is where I want the corresponding DocumentInputType>>) => void
}
Learn how to utilize a conditional type:
type DocumentInputTypeOf<DocType extends DocumentType>
= DocType extends Item ? ItemInputType
: DocType extends List ? ListInputType
: UserInputType
type Documents<DocType extends DocumentType> = {
data: DocType[]
createDocument: (input: DocumentInputTypeOf<DocType>) => void
}
My approach to writing this would be as follows:
export type DocumentsUnion =
| {data: Item[], createDocument: (input: ItemInputType) => void}
| {data: List[], createDocument: (input: ListInputType) => void}
| {data: User[], createDocument: (input: UserInputType) => void}
// Defining types based on the union of data in DocumentsUnion
export type DocumentType = DocumentsUnion['data'][number]
export type DocumentInputType = DocumentsUnion['createDocument'] extends infer F ? F extends (input: infer U) => void ? U : never : never
// Extracting documents based on specified type T
export type Documents<T extends DocumentType> = Extract<DocumentsUnion, {data: T[]}>
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