fix #13818 (#13824)

Author: lukka

Extension/src/LanguageServer/Providers/CopilotHoverProvider.ts

@@ -5,6 +5,7 @@
 import * as vscode from 'vscode';
 import { Position, ResponseError } from 'vscode-languageclient';
 import * as nls from 'vscode-nls';
+import { getVSCodeLanguageModel } from '../../common';
 import { modelSelector } from '../../constants';
 import * as telemetry from '../../telemetry';
 import { DefaultClient, GetCopilotHoverInfoParams, GetCopilotHoverInfoRequest, GetCopilotHoverInfoResult } from '../client';
@@ -42,7 +43,7 @@ export class CopilotHoverProvider implements vscode.HoverProvider {
         }
 
         // Ensure the user has access to Copilot.
-        const vscodelm = (vscode as any).lm;
+        const vscodelm = getVSCodeLanguageModel();
         if (vscodelm) {
             const [model] = await vscodelm.selectChatModels(modelSelector);
             if (!model) {

Extension/src/LanguageServer/extension.ts

@@ -1413,8 +1413,7 @@ export async function preReleaseCheck(): Promise<void> {
 async function onCopilotHover(): Promise<void> {
     telemetry.logLanguageServerEvent("CopilotHover");
 
-    // Check if the user has access to vscode language model.
-    const vscodelm = (vscode as any).lm;
+    const vscodelm = util.getVSCodeLanguageModel();
     if (!vscodelm) {
         return;
     }
@@ -1477,6 +1476,7 @@ async function onCopilotHover(): Promise<void> {
 
     let chatResponse: vscode.LanguageModelChatResponse | undefined;
     try {
+        // Select the chat model.
         const [model] = await vscodelm.selectChatModels(modelSelector);
 
         chatResponse = await model.sendRequest(

Extension/src/common.ts

@@ -1828,3 +1828,16 @@ export function equals(array1: string[] | undefined, array2: string[] | undefine
     }
     return true;
 }
+
+export function getVSCodeLanguageModel(): any | undefined {
+    // Check if the user has access to vscode language model.
+    const vscodelm = (vscode as any).lm;
+    if (!vscodelm) {
+        return undefined;
+    }
+    // Check that vscodelm has a method called 'selectChatModels'
+    if (!vscodelm.selectChatModels || typeof vscodelm.selectChatModels !== 'function') {
+        return undefined;
+    }
+    return vscodelm;
+}