fix: remove deprecated API

BREAKING CHANGE: Extensions that still use these APIs can not be tested anymore with this version of the stubs.

src/api.ts

@@ -3,22 +3,7 @@ import { BehaviorSubject, Subject, Subscription } from 'rxjs'
 import { mapTo } from 'rxjs/operators'
 import * as sinon from 'sinon'
 import * as sourcegraph from 'sourcegraph'
-import { deprecate } from 'util'
-import { assertTypeIsCompatible, notImplemented } from './util'
-
-interface DeprecatedTypeDefinitionProvider {
-    provideTypeDefinition(
-        document: sourcegraph.TextDocument,
-        position: Position
-    ): sourcegraph.ProviderResult<sourcegraph.Definition>
-}
-
-interface DeprecatedImplementationProvider {
-    provideImplementation(
-        document: sourcegraph.TextDocument,
-        position: Position
-    ): sourcegraph.ProviderResult<sourcegraph.Definition>
-}
+import { notImplemented, subTypeOf } from './util'
 
 let decorationTypeCounter = 0
 
@@ -30,7 +15,7 @@ export const createStubSourcegraphAPI = () => {
     const configSubject = new BehaviorSubject<any>({})
     const rootChanges = new Subject<void>()
     const openedTextDocuments = new Subject<sourcegraph.TextDocument>()
-    const stubs /* : typeof import('sourcegraph') */ = {
+    const stubs = subTypeOf<typeof import('sourcegraph')>()({
         // Classes
         URI: URL,
         Position,
@@ -75,20 +60,6 @@ export const createStubSourcegraphAPI = () => {
                 (selector: sourcegraph.DocumentSelector, provider: sourcegraph.CompletionItemProvider) =>
                     new Subscription()
             ),
-            registerTypeDefinitionProvider: sinon.spy(
-                deprecate(
-                    (selector: sourcegraph.DocumentSelector, provider: DeprecatedTypeDefinitionProvider) =>
-                        new Subscription(),
-                    'sourcegraph.languages.registerTypeDefinitionProvider() is deprecated. Use sourcegraph.languages.registerLocationProvider() instead.'
-                )
-            ),
-            registerImplementationProvider: sinon.spy(
-                deprecate(
-                    (selector: sourcegraph.DocumentSelector, provider: DeprecatedImplementationProvider) =>
-                        new Subscription(),
-                    'sourcegraph.languages.registerImplementationProvider() is deprecated. Use sourcegraph.languages.registerLocationProvider() instead.'
-                )
-            ),
         },
         app: {
             windows: [] as sourcegraph.Window[],
@@ -98,7 +69,7 @@ export const createStubSourcegraphAPI = () => {
             activeWindowChanges: new BehaviorSubject<sourcegraph.Window | undefined>(undefined),
 
             createDecorationType: () => ({ key: 'decorationType' + decorationTypeCounter++ }),
-            createPanelView: notImplemented as ((id: string) => sourcegraph.PanelView),
+            createPanelView: notImplemented as (id: string) => sourcegraph.PanelView,
         },
         configuration: Object.assign(configSubject.pipe(mapTo(undefined)), {
             get: <C extends object = { [key: string]: any }>(): sourcegraph.Configuration<C> => ({
@@ -123,7 +94,6 @@ export const createStubSourcegraphAPI = () => {
             registerCommand: sinon.spy((command: string, callback: (...args: any[]) => any) => new Subscription()),
             executeCommand: sinon.spy<(command: string, ...args: any[]) => Promise<any>>(notImplemented),
         },
-    }
-    assertTypeIsCompatible<typeof sourcegraph>(stubs)
+    })
     return stubs
 }

src/context.ts

@@ -1,16 +1,15 @@
 import { Subscription } from 'rxjs'
 import * as sinon from 'sinon'
 import { ExtensionContext } from 'sourcegraph'
-import { assertTypeIsCompatible } from './util'
+import { subTypeOf } from './util'
 
 export const createStubExtensionContext = () => {
     const subscriptions = sinon.stub(new Subscription())
     subscriptions.add.callThrough()
     subscriptions.remove.callThrough()
     subscriptions.unsubscribe.callThrough()
-    const context = {
+    const context = subTypeOf<ExtensionContext>()({
         subscriptions,
-    }
-    assertTypeIsCompatible<ExtensionContext>(context)
+    })
     return context
 }

src/util.ts

@@ -1,7 +1,10 @@
 /**
- * Compile-time helper to assert a given type.
+ * Identity-function helper to ensure a value `T` is a subtype of `U`.
+ *
+ * @template U The type to check for (explicitly specify this)
+ * @template T The actual type (inferred, don't specify this)
  */
-export const assertTypeIsCompatible = <T>(val: T): void => undefined
+export const subTypeOf = <U>() => <T extends U>(value: T): T => value
 
 export function notImplemented(): never {
     throw new Error('Stub functionality not implemented')