Smarter datasource

packages/client/src/components/app/DataProvider.svelte

@@ -5,6 +5,7 @@
     fetchData,
     QueryUtils,
     DataFetchOptions,
+    ProviderDatasource,
   } from "@budibase/frontend-core"
   import {
     LogicalOperator,
@@ -15,7 +16,7 @@
   } from "@budibase/types"
   import { SDK, Component } from "../../index"
 
-  export let dataSource
+  export let dataSource: ProviderDatasource
   export let filter
   export let sortColumn
   export let sortOrder
@@ -98,7 +99,7 @@
     primaryDisplay: ($fetch.definition as any)?.primaryDisplay,
   }
 
-  const createFetch = (datasource: any) => {
+  const createFetch = (datasource: ProviderDatasource) => {
     return fetchData({
       API,
       datasource,

packages/frontend-core/src/fetch/index.ts

@@ -35,6 +35,23 @@ export const DataFetchMap = {
   queryarray: QueryArrayFetch,
 }
 
+export interface DataFetchClassMap {
+  table: TableFetch
+  view: ViewFetch
+  viewV2: ViewV2Fetch
+  query: QueryFetch
+  link: RelationshipFetch
+  user: UserFetch
+  groupUser: GroupUserFetch
+  custom: CustomFetch
+
+  // Client specific datasource types
+  provider: NestedProviderFetch
+  field: FieldFetch<"field">
+  jsonarray: JSONArrayFetch
+  queryarray: QueryArrayFetch
+}
+
 export type DataFetch =
   | TableFetch
   | ViewFetch
@@ -60,8 +77,11 @@ export type DataFetchDatasource =
   | CustomDatasource
   | NestedProviderDatasource
   | FieldDatasource<"field" | "queryarray" | "jsonarray">
-// | FieldDatasource<"field" | "queryarray" | "jsonarray">
+
-// | FieldDatasource<"field" | "queryarray" | "jsonarray">
+export type ProviderDatasource = Exclude<
+  DataFetchDatasource,
+  UserDatasource | GroupUserDatasource
+>
 
 export type DataFetchDefinition =
   | Table
@@ -72,22 +92,27 @@ export type DataFetchDefinition =
     }
 
 // Constructs a new fetch model for a certain datasource
-export const fetchData = ({
+export const fetchData = <
+  T extends DataFetchDatasource,
+  Type extends T["type"] = T["type"]
+>({
   API,
   datasource,
   options,
 }: {
   API: APIClient
-  datasource: DataFetchDatasource
+  datasource: T
   options: any
-}) => {
+}): Type extends keyof DataFetchClassMap
+  ? DataFetchClassMap[Type]
+  : TableFetch => {
   const Fetch = DataFetchMap[datasource?.type] || TableFetch
   const fetch = new Fetch({ API, datasource, ...options })
 
   // Initially fetch data but don't bother waiting for the result
   fetch.getInitialData()
 
-  return fetch
+  return fetch as any
 }
 
 // Creates an empty fetch instance with no datasource configured, so no data

packages/frontend-core/src/index.ts

@@ -1,7 +1,11 @@
 export { createAPIClient } from "./api"
 export type { APIClient } from "./api"
 export { fetchData, DataFetchMap } from "./fetch"
-export type { DataFetchType, DataFetchOptions } from "./fetch"
+export type {
+  DataFetchType,
+  DataFetchOptions,
+  ProviderDatasource,
+} from "./fetch"
 export * as Constants from "./constants"
 export * from "./stores"
 export * from "./utils"