Merge pull request #3341 from github/robertbrignull/unknown_type_checking

Use unknown instead of any in type functions

extensions/ql-vscode/src/common/errors.ts

@@ -84,12 +84,13 @@ export interface ErrorLike {
   stack?: string;
 }
 
-function isErrorLike(error: any): error is ErrorLike {
+function isErrorLike(error: unknown): error is ErrorLike {
-  if (
+  return (
+    error !== undefined &&
+    error !== null &&
+    typeof error === "object" &&
+    "message" in error &&
     typeof error.message === "string" &&
-    (error.stack === undefined || typeof error.stack === "string")
+    (!("stack" in error) || typeof error.stack === "string")
-  ) {
+  );
-    return true;
-  }
-  return false;
 }

extensions/ql-vscode/src/common/files.ts

@@ -124,8 +124,14 @@ export interface IOError {
   readonly code: string;
 }
 
-export function isIOError(e: any): e is IOError {
+export function isIOError(e: unknown): e is IOError {
-  return e.code !== undefined && typeof e.code === "string";
+  return (
+    e !== undefined &&
+    e !== null &&
+    typeof e === "object" &&
+    "code" in e &&
+    typeof e.code === "string"
+  );
 }
 
 // This function is a wrapper around `os.tmpdir()` to make it easier to mock in tests.

extensions/ql-vscode/src/local-queries/local-queries.ts

@@ -600,6 +600,11 @@ export class LocalQueries extends DisposableObject {
   }
 }
 
-function isTabInputText(input: any): input is TabInputText {
+function isTabInputText(input: unknown): input is TabInputText {
-  return input?.uri !== undefined;
+  return (
+    input !== null &&
+    typeof input === "object" &&
+    "uri" in input &&
+    input?.uri !== undefined
+  );
 }