diff --git a/.github/instructions/generic.instructions.md b/.github/instructions/generic.instructions.md
index 3f43f207..5ac0cc0d 100644
--- a/.github/instructions/generic.instructions.md
+++ b/.github/instructions/generic.instructions.md
@@ -30,3 +30,7 @@ Provide project context and coding guidelines that AI should follow when generat
 ## Documentation
 
 -   Add clear docstrings to public functions, describing their purpose, parameters, and behavior.
+
+## Learnings
+
+-   Avoid using 'any' types in TypeScript; import proper types from VS Code API and use specific interfaces for mocks and test objects (1)
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 60ebcf3a..cfa27fdf 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -35,6 +35,6 @@ export default [{
         eqeqeq: "warn",
         "no-throw-literal": "warn",
         semi: "warn",
-        "@typescript-eslint/no-explicit-any": "warn",
+        "@typescript-eslint/no-explicit-any": "error",
     },
 }];
\ No newline at end of file
diff --git a/src/test/features/terminalEnvVarInjectorBasic.unit.test.ts b/src/test/features/terminalEnvVarInjectorBasic.unit.test.ts
index 4b009e99..5e7ffe54 100644
--- a/src/test/features/terminalEnvVarInjectorBasic.unit.test.ts
+++ b/src/test/features/terminalEnvVarInjectorBasic.unit.test.ts
@@ -3,7 +3,8 @@
 
 import * as sinon from 'sinon';
 import * as typeMoq from 'typemoq';
-import { GlobalEnvironmentVariableCollection, workspace } from 'vscode';
+import { Disposable, GlobalEnvironmentVariableCollection, workspace, WorkspaceFolder } from 'vscode';
+import { DidChangeEnvironmentVariablesEventArgs } from '../../api';
 import { EnvVarManager } from '../../features/execution/envVariableManager';
 import { TerminalEnvVarInjector } from '../../features/terminal/terminalEnvVarInjector';
 
@@ -18,8 +19,7 @@ suite('TerminalEnvVarInjector Basic Tests', () => {
     let envVarManager: typeMoq.IMock<EnvVarManager>;
     let injector: TerminalEnvVarInjector;
     let mockScopedCollection: MockScopedCollection;
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    let workspaceFoldersStub: any;
+    let workspaceFoldersStub: WorkspaceFolder[];
 
     setup(() => {
         envVarCollection = typeMoq.Mock.ofType<GlobalEnvironmentVariableCollection>();
@@ -40,19 +40,25 @@ suite('TerminalEnvVarInjector Basic Tests', () => {
         };
 
         // Setup environment variable collection to return scoped collection
-        envVarCollection.setup((x) => x.getScoped(typeMoq.It.isAny())).returns(() => mockScopedCollection as any);
+        envVarCollection.setup((x) => x.getScoped(typeMoq.It.isAny())).returns(() => mockScopedCollection as never);
         envVarCollection.setup((x) => x.clear()).returns(() => {});
 
         // Setup minimal mocks for event subscriptions
         envVarManager
             .setup((m) => m.onDidChangeEnvironmentVariables)
-            .returns(
-                () =>
+            .returns(() => {
+                // Return a mock Event function that returns a Disposable when called
+                const mockEvent = (_listener: (e: DidChangeEnvironmentVariablesEventArgs) => void) =>
                     ({
                         dispose: () => {},
-                        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-                    } as any),
-            );
+                    } as Disposable);
+                return mockEvent;
+            });
+
+        // Mock workspace.onDidChangeConfiguration to return a Disposable
+        sinon.stub(workspace, 'onDidChangeConfiguration').returns({
+            dispose: () => {},
+        } as Disposable);
     });
 
     teardown(() => {
@@ -85,12 +91,21 @@ suite('TerminalEnvVarInjector Basic Tests', () => {
         envVarManager.reset();
         envVarManager
             .setup((m) => m.onDidChangeEnvironmentVariables)
-            .returns((_handler) => {
+            .returns(() => {
                 eventHandlerRegistered = true;
-                // eslint-disable-next-line @typescript-eslint/no-explicit-any
-                return { dispose: () => {} } as any;
+                // Return a mock Event function that returns a Disposable when called
+                const mockEvent = (_listener: (e: DidChangeEnvironmentVariablesEventArgs) => void) =>
+                    ({
+                        dispose: () => {},
+                    } as Disposable);
+                return mockEvent;
             });
 
+        // Mock workspace.onDidChangeConfiguration to return a Disposable
+        sinon.stub(workspace, 'onDidChangeConfiguration').returns({
+            dispose: () => {},
+        } as Disposable);
+
         // Act
         injector = new TerminalEnvVarInjector(envVarCollection.object, envVarManager.object);