Make context.core required argument to context providers (#59996)

* Make context.core required argument to context providers

* Refactor plugins: context.core isn't optional anymore

* Update docs

docs/development/core/public/kibana-plugin-core-public.icontextprovider.md

@@ -9,7 +9,7 @@ A function that returns a context value for a specific key of given context type
 <b>Signature:</b>
 
 ```typescript
-export declare type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: Partial<HandlerContextType<THandler>>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
+export declare type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: PartialExceptFor<HandlerContextType<THandler>, 'core'>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
 ```
 
 ## Remarks

docs/development/core/server/kibana-plugin-core-server.icontextprovider.md

@@ -9,7 +9,7 @@ A function that returns a context value for a specific key of given context type
 <b>Signature:</b>
 
 ```typescript
-export declare type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: Partial<HandlerContextType<THandler>>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
+export declare type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: PartialExceptFor<HandlerContextType<THandler>, 'core'>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
 ```
 
 ## Remarks

src/core/public/public.api.md

@@ -735,8 +735,10 @@ export interface IContextContainer<THandler extends HandlerFunction<any>> {
     registerContext<TContextName extends keyof HandlerContextType<THandler>>(pluginOpaqueId: PluginOpaqueId, contextName: TContextName, provider: IContextProvider<THandler, TContextName>): this;
 }
 
+// Warning: (ae-forgotten-export) The symbol "PartialExceptFor" needs to be exported by the entry point index.d.ts
+//
 // @public
-export type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: Partial<HandlerContextType<THandler>>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
+export type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: PartialExceptFor<HandlerContextType<THandler>, 'core'>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
 
 // @public (undocumented)
 export interface IHttpFetchError extends Error {

src/core/server/server.api.md

@@ -882,8 +882,10 @@ export interface IContextContainer<THandler extends HandlerFunction<any>> {
     registerContext<TContextName extends keyof HandlerContextType<THandler>>(pluginOpaqueId: PluginOpaqueId, contextName: TContextName, provider: IContextProvider<THandler, TContextName>): this;
 }
 
+// Warning: (ae-forgotten-export) The symbol "PartialExceptFor" needs to be exported by the entry point index.d.ts
+//
 // @public
-export type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: Partial<HandlerContextType<THandler>>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
+export type IContextProvider<THandler extends HandlerFunction<any>, TContextName extends keyof HandlerContextType<THandler>> = (context: PartialExceptFor<HandlerContextType<THandler>, 'core'>, ...rest: HandlerParameters<THandler>) => Promise<HandlerContextType<THandler>[TContextName]> | HandlerContextType<THandler>[TContextName];
 
 // @public
 export interface ICspConfig {

src/core/utils/context.ts

@@ -22,6 +22,11 @@ import { ShallowPromise } from '@kbn/utility-types';
 import { pick } from '.';
 import { CoreId, PluginOpaqueId } from '../server';
 
+/**
+ * Make all properties in T optional, except for the properties whose keys are in the union K
+ */
+type PartialExceptFor<T, K extends keyof T> = Partial<T> & Pick<T, K>;
+
 /**
  * A function that returns a context value for a specific key of given context type.
  *
@@ -39,7 +44,8 @@ export type IContextProvider<
   THandler extends HandlerFunction<any>,
   TContextName extends keyof HandlerContextType<THandler>
 > = (
-  context: Partial<HandlerContextType<THandler>>,
+  // context.core will always be available, but plugin contexts are typed as optional
+  context: PartialExceptFor<HandlerContextType<THandler>, 'core'>,
   ...rest: HandlerParameters<THandler>
 ) =>
   | Promise<HandlerContextType<THandler>[TContextName]>
@@ -261,7 +267,7 @@ export class ContextContainer<THandler extends HandlerFunction<any>>
         // registered that provider.
         const exposedContext = pick(resolvedContext, [
           ...this.getContextNamesForSource(providerSource),
-        ]) as Partial<HandlerContextType<THandler>>;
+        ]) as PartialExceptFor<HandlerContextType<THandler>, 'core'>;
 
         return {
           ...resolvedContext,

src/plugins/data/server/search/search_service.ts

@@ -55,7 +55,7 @@ export class SearchService implements Plugin<ISearchSetup, void> {
 
     core.http.registerRouteHandlerContext<'search'>('search', context => {
       return createApi({
-        caller: context.core!.elasticsearch.dataClient.callAsCurrentUser,
+        caller: context.core.elasticsearch.dataClient.callAsCurrentUser,
         searchStrategies: this.searchStrategies,
       });
     });

test/plugin_functional/plugins/core_plugin_a/server/plugin.ts

@@ -34,7 +34,7 @@ export class CorePluginAPlugin implements Plugin {
     core.http.registerRouteHandlerContext('pluginA', context => {
       return {
         ping: () =>
-          context.core!.elasticsearch.adminClient.callAsInternalUser('ping') as Promise<string>,
+          context.core.elasticsearch.adminClient.callAsInternalUser('ping') as Promise<string>,
       };
     });
   }

x-pack/plugins/actions/server/plugin.ts

@@ -282,7 +282,7 @@ export class ActionsPlugin implements Plugin<Promise<PluginSetupContract>, Plugi
             );
           }
           return new ActionsClient({
-            savedObjectsClient: context.core!.savedObjects.client,
+            savedObjectsClient: context.core.savedObjects.client,
             actionTypeRegistry: actionTypeRegistry!,
             defaultKibanaIndex,
             scopedClusterClient: adminClient!.asScoped(request),

x-pack/plugins/alerting/server/plugin.ts

@@ -244,7 +244,7 @@ export class AlertingPlugin {
     return async function alertsRouteHandlerContext(context, request) {
       return {
         getAlertsClient: () => {
-          return alertsClientFactory!.create(request, context.core!.savedObjects.client);
+          return alertsClientFactory!.create(request, context.core.savedObjects.client);
         },
         listTypes: alertTypeRegistry!.list.bind(alertTypeRegistry!),
       };

x-pack/plugins/licensing/server/licensing_route_handler_context.test.ts

@@ -17,9 +17,9 @@ describe('createRouteHandlerContext', () => {
 
     const routeHandler = createRouteHandlerContext(license$);
 
-    const firstCtx = await routeHandler({}, {} as any, {} as any);
+    const firstCtx = await routeHandler({} as any, {} as any, {} as any);
     license$.next(secondLicense);
-    const secondCtx = await routeHandler({}, {} as any, {} as any);
+    const secondCtx = await routeHandler({} as any, {} as any, {} as any);
 
     expect(firstCtx.license).toBe(firstLicense);
     expect(secondCtx.license).toBe(secondLicense);