Check for undefined in isThenable

jakebailey · jakebailey · commit e298a2708e22 · 2020-04-10T14:57:37.000-07:00
diff --git a/src/client/activation/languageClientMiddleware.ts b/src/client/activation/languageClientMiddleware.ts
@@ -470,5 +470,5 @@ function captureTelemetryForLSPMethod(method: string, debounceMilliseconds: numb
 
 // tslint:disable-next-line: no-any
 function isThenable<T>(v: any): v is Thenable<T> {
-    return typeof v.then === 'function';
+    return typeof v?.then === 'function';
 }

Original file line number	Diff line number	Diff line change
`@@ -470,5 +470,5 @@ function captureTelemetryForLSPMethod(method: string, debounceMilliseconds: numb`
`470`	`470`
`471`	`471`	`// tslint:disable-next-line: no-any`
`472`	`472`	`function isThenable<T>(v: any): v is Thenable<T> {`
`473`		`- return typeof v.then === 'function';`
	`473`	`+ return typeof v?.then === 'function';`
`474`	`474`	`}`