build: Upgrade to TypeScript 5.6.2

package.json

@@ -137,7 +137,7 @@
     "sass": "^1.39.0",
     "source-map-explorer": "^2.5.2",
     "stylelint": "^14.5.1",
-    "typescript": "~4.9.4",
+    "typescript": "~5.6.2",
     "vite": "^5.4.2"
   },
   "prettier": "@deephaven/prettier-config",

packages/components/src/BulkActionBar.tsx

@@ -22,7 +22,7 @@ export function BulkActionBar({
       selectedItemCount={selectedItemCount}
       onClearSelection={onClearSelection}
     >
-      {/* */}
+      <span />
     </ActionBar>
   );
 }

packages/components/src/context-actions/ContextActionUtils.ts

@@ -14,7 +14,7 @@ export interface ContextAction {
   description?: string;
   action?: (event: Event) => void;
   actions?: ResolvableContextAction[];
-  icon?: IconDefinition | React.ReactElement;
+  icon?: IconDefinition | React.ReactElement<unknown>;
   iconColor?: string;
   shortcut?: Shortcut;
 

packages/components/src/spectrum/utils/itemUtils.ts

@@ -256,7 +256,9 @@ export function isNormalizedItemsWithKeysList<
     return true;
   }
 
-  return !isItemOrSection(node[0]) && 'key' in node[0];
+  return (
+    !isItemOrSection(node[0]) && typeof node[0] === 'object' && 'key' in node[0]
+  );
 }
 
 /**

packages/dashboard-core-plugins/src/panels/IrisGridPanel.tsx

@@ -62,6 +62,7 @@ import {
 import {
   assertNotNull,
   CancelablePromise,
+  EventT,
   PromiseUtils,
 } from '@deephaven/utils';
 import { ResolvableContextAction } from '@deephaven/components';
@@ -703,7 +704,7 @@ export class IrisGridPanel extends PureComponent<
     }
   }
 
-  handleColumnsChanged(event: Event): void {
+  handleColumnsChanged(event: EventT): void {
     const { isModelReady, model, modelQueue } = this.state;
     if (isModelReady) {
       this.sendColumnsChange((event as CustomEvent).detail);
@@ -713,7 +714,7 @@ export class IrisGridPanel extends PureComponent<
     }
   }
 
-  handleTableChanged(event: Event): void {
+  handleTableChanged(event: EventT): void {
     log.debug('handleTableChanged', event);
     const { glEventHub } = this.props;
     const { detail: table } = event as CustomEvent;

packages/iris-grid/src/IrisGrid.tsx

@@ -88,6 +88,7 @@ import {
   PromiseUtils,
   ValidationError,
   getOrThrow,
+  type EventT,
 } from '@deephaven/utils';
 import {
   Type as FilterType,
@@ -3103,7 +3104,7 @@ class IrisGrid extends Component<IrisGridProps, IrisGridState> {
     }));
   }
 
-  handleRequestFailed(event: Event): void {
+  handleRequestFailed(event: EventT): void {
     const { detail: error } = event as CustomEvent;
     log.error('request failed:', error);
     this.stopLoading();

packages/iris-grid/src/sidebar/CustomColumnBuilder.tsx

@@ -6,7 +6,7 @@ import { DragDropContext, Droppable, DropResult } from 'react-beautiful-dnd';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { Button, DragUtils, LoadingSpinner } from '@deephaven/components';
 import { dhNewCircleLargeFilled, vsWarning, vsPass } from '@deephaven/icons';
-import { DbNameValidator } from '@deephaven/utils';
+import { DbNameValidator, EventT } from '@deephaven/utils';
 import CustomColumnInput from './CustomColumnInput';
 import './CustomColumnBuilder.scss';
 import IrisGridModel from '../IrisGridModel';
@@ -211,7 +211,7 @@ class CustomColumnBuilder extends Component<
     );
   }
 
-  handleRequestFailed(event: Event): void {
+  handleRequestFailed(event: EventT): void {
     const customEvent = event as CustomEvent;
     const { isCustomColumnApplying } = this.state;
     if (!isCustomColumnApplying) {

packages/log/src/LogProxy.ts

@@ -125,14 +125,20 @@ export class LogProxy {
     listener: (event: CustomEvent<unknown[]>) => void
   ): void {
     // The cast as EventListener is a dumb TypeScript issue
-    this.eventTarget.addEventListener(type, listener as EventListener);
+    this.eventTarget.addEventListener(
+      type,
+      listener as Parameters<EventTarget['addEventListener']>[1]
+    );
   }
 
   removeEventListener(
     type: LOG_PROXY_TYPE,
     listener: (event: CustomEvent<unknown[]>) => void
   ): void {
-    this.eventTarget.removeEventListener(type, listener as EventListener);
+    this.eventTarget.removeEventListener(
+      type,
+      listener as Parameters<EventTarget['removeEventListener']>[1]
+    );
   }
 }
 

packages/plugin/src/PluginTypes.ts

@@ -160,7 +160,7 @@ export interface WidgetPlugin<T = unknown> extends Plugin {
    * If a react node is provided (including a string), it will be rendered directly.
    * If no icon is specified, the default widget icon will be used.
    */
-  icon?: IconDefinition | React.ReactElement;
+  icon?: IconDefinition | React.ReactElement<unknown>;
 }
 
 export function isWidgetPlugin(plugin: PluginModule): plugin is WidgetPlugin {

packages/redux/src/reducers/common/mergeReducer.ts

@@ -11,7 +11,7 @@ export default function mergeReducer<S>(
   initialState: S
 ): Reducer<S> {
   return (state = initialState, action?) => {
-    switch (action.type) {
+    switch (action?.type) {
       case type: {
         const newState = action.payload;
         if (newState == null) {

packages/redux/src/reducers/common/replaceByIdReducer.ts

@@ -12,7 +12,7 @@ export default function replaceByIdReducer<S extends Record<string, unknown>>(
   checkIfChanged = true
 ): Reducer<S> {
   return (state = initialState, action?) => {
-    switch (action.type) {
+    switch (action?.type) {
       case type: {
         const { id, payload } = action;
         if (checkIfChanged && deepEqual({ payload }, { payload: state[id] })) {

packages/redux/src/reducers/common/replaceReducer.ts

@@ -11,7 +11,7 @@ export default function replaceReducer<S>(
   initialState: S
 ): Reducer<S> {
   return (state = initialState, action?) => {
-    switch (action.type) {
+    switch (action?.type) {
       case type: {
         return action.payload;
       }