Add TypeScript types for function props in READMEs

packages/components/src/tools-panel/tools-panel-header/README.md

@@ -25,15 +25,15 @@ Text to be displayed within the panel header. It is also passed along as the
 
 -   Required: Yes
 
-### `resetAll`: `function`
+### `resetAll`: `() => void`
 
 The `resetAll` prop provides the callback to execute when the "Reset all" menu
 item is selected. Its purpose is to facilitate resetting any control values
 for items contained within this header's panel.
 
 -   Required: Yes
 
-### `toggleItem`: `function`
+### `toggleItem`: `( label: string ) => void`
 
 This is executed when an individual control's menu item is toggled. It
 will update the panel's menu item state and call the panel item's `onSelect` or

packages/components/src/tools-panel/tools-panel-item/README.md

@@ -18,7 +18,7 @@ for how to use `ToolsPanelItem`.
 
 ## Props
 
-### `hasValue`: `function`
+### `hasValue`: `() => boolean`
 
 This is called when building the `ToolsPanel` menu to determine the item's
 initial checked state.
@@ -45,14 +45,14 @@ A panel item's `label` should be unique among all items within a single panel.
 
 -   Required: Yes
 
-### `onDeselect`: `function`
+### `onDeselect`: `() => void`
 
 Called when this item is deselected in the `ToolsPanel` menu. This is normally
 used to reset the panel item control's value.
 
 -   Required: No
 
-### `onSelect`: `function`
+### `onSelect`: `() => void`
 
 A callback to take action when this item is selected in the `ToolsPanel` menu.
 
@@ -66,7 +66,7 @@ allows items to be injected from a shared source.
 
 -   Required: No
 
-### `resetAllFilter`: `function`
+### `resetAllFilter`: `() => void`
 
 A `ToolsPanel` will collect each item's `resetAllFilter` and pass an array of
 these functions through to the panel's `resetAll` callback. They can then be

packages/components/src/tools-panel/tools-panel/README.md

@@ -74,15 +74,15 @@ panel's dropdown menu.
 
 - Required: Yes
 
-### `panelId`: `function`
+### `panelId`: `string`
 
 If a `panelId` is set, it is passed through the `ToolsPanelContext` and used
 to restrict panel items. Only items with a matching `panelId` will be able
 to register themselves with this panel.
 
 - Required: No
 
-### `resetAll`: `function`
+### `resetAll`: `() => void`
 
 A function to call when the `Reset all` menu option is selected. This is passed
 through to the panel's header component.