feat: Add SidePanel to labs (#866)

Usage:
```tsx
const {panelProps, labelProps, controlProps} = useSidePanel({ initialExpanded: false, panelId: 'side-panel-1'});

// somewhere in your JSX
<SidePanel {...panelProps}>
  <SidePanel.ToggleButton {...buttonProps} />
  <span hidden>Accessible Label for Panel</span>
</SidePanel>
```

cypress/integration/SidePanelLabs.spec.ts

@@ -0,0 +1,79 @@
+import * as h from '../helpers';
+
+describe('Side Panel', () => {
+  before(() => {
+    h.stories.visit();
+  });
+
+  const name = /Accessible Label Name/i;
+
+  [
+    {name: 'Default', role: 'region'},
+    {name: 'AsAside', role: 'complementary'},
+    {name: 'AsDiv', role: 'region'},
+  ].forEach(story => {
+    context(`given the "${story.name}" story is rendered`, () => {
+      beforeEach(() => {
+        h.stories.load('Testing|React/Labs/Side Panel/Cypress', story.name);
+      });
+
+      it('should not have any axe errors', () => {
+        cy.checkA11y();
+      });
+
+      context('the button', () => {
+        it(`should have an accessible name`, () => {
+          cy.findByRole('button', {name}).should('exist');
+        });
+
+        it(`should have an aria-expanded attribute of 'true'`, () => {
+          cy.findByRole('button', {name}).should('have.attr', 'aria-expanded', 'true');
+        });
+
+        it(`should have an aria-controls attribute equal to the id of the panel`, () => {
+          cy.findByRole('button', {name}).then(button => {
+            const buttonAriaControlsValue = button.attr('aria-controls');
+            cy.findByRole(story.role, {name}).should('have.attr', 'id', buttonAriaControlsValue);
+          });
+        });
+      });
+
+      it(`should have a panel with a landmark role`, () => {
+        cy.findByRole(story.role, {name}).should('exist');
+      });
+
+      context(`when collapsing the panel`, () => {
+        beforeEach(() => {
+          cy.findByRole('button', {name}).click();
+        });
+
+        context('the button', () => {
+          it(`should have an aria-expanded attribute of 'false'`, () => {
+            cy.findByRole('button', {name}).should('have.attr', 'aria-expanded', 'false');
+          });
+        });
+      });
+    });
+  });
+
+  describe(`given the 'first focusable' story is rendered`, () => {
+    context(`when focused on a focusable element preceding the Side Panel`, () => {
+      beforeEach(() => {
+        h.stories.load('Testing|React/Labs/Side Panel/Cypress', 'First Focusable');
+        cy.findByLabelText('Avatar').focus();
+      });
+
+      context('when the tab key is pressed once', () => {
+        beforeEach(() => {
+          cy.tab();
+        });
+
+        context('the expand/collapse control button', () => {
+          it(`should be focused first`, () => {
+            cy.findByRole('button', {name}).should('have.focus');
+          });
+        });
+      });
+    });
+  });
+});

modules/_labs/side-panel/react/LICENSE

@@ -0,0 +1,52 @@
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modules/_labs/side-panel/react/README.md

@@ -0,0 +1,128 @@
+# Canvas Kit React Side Panel
+
+<a href="https://github.com/Workday/canvas-kit/tree/master/modules/_labs/README.md">
+  <img src="https://img.shields.io/badge/LABS-alpha-orange" alt="LABS: Alpha" />
+</a>  This component is work in progress and currently in pre-release.
+
+A collapsable side panel
+
+## Installation
+
+```sh
+yarn add @workday/canvas-kit-labs-react-side-panel
+```
+
+## Usage
+
+```tsx
+import SidePanel, {useSidePanel} from '@workday/canvas-kit-labs-react-side-panel';
+
+/**
+ * A SidePanel is made up of three components
+ * - The panel itself <SidePanel>
+ * - An accessible name (either an existing element or you can use <span hidden>)
+ * - A control that expands/collapses the SidePanel, usually <SidePanel.ToggleButton> as a child of <SidePanel>
+ * A convenience hook is available for setting the state of the SidePanel along with the proper aria- attributes
+ *
+ */
+const {panelProps, labelProps, controlProps} = useSidePanel();
+
+<SidePanel {...panelProps}>
+  <SidePanel.ToggleButton {...controlProps} />
+  <h3 {...labelProps}>Tasks Panel</h3>
+  {/* Your panel contents */}
+</SidePanel>
+
+```
+## Hooks
+### `useSidePanel`
+This hook manages the state and `aria-` attributes for the SidePanel. It takes in a `config` object:
+* `intialExpanded: boolean`: Specifies the initial expanded/collapsed state of the side panel.
+* `panelId: string`: specifies the id of the panel, if `undefined` then this hook will generate one
+* `labelId: string` specifies the id of the label, if `undefined` then this hook will generate one
+
+and returns:
+* `expanded: boolean`: The state for the `SidePanel`'s `expanded` prop.
+* `setExpanded: (expanded?: boolean) => void`: A function that sets the `expanded` state.
+* `panelProps: object`: Contains the `expanded`, `id`, and `aria-labelledby` props for the `SidePanel` (or equivalent) component.
+* `labelProps: object`: Contains the `id` prop for the label.
+* `controlProps: object`: Contains the `aria-controls`, `aria-expanded`, `aria-labelledby`, and click handler for the side panel's control element.
+
+#### Usage
+```tsx
+const [expanded, setExpanded, panelProps, labelProps, controlProps] = useSidePanel({
+  initialExpanded: true,
+  panelId: 'side-panel-1',
+  labelId: 'side-panel-label-1'
+});
+
+<SidePanel {...panelProps}>
+  {/* Make sure the control is first focusable */}
+  <SidePanel.ToggleButton {...controlProps} />
+  <span hidden {...labelProps}>Example Panel</span>
+  {/* Rest of the children here */}
+</SidePanel>
+
+or
+
+<SidePanel {...panelProps}>
+  {/* If you want to use your own button */}
+  <CustomControl {...controlProps} />
+  {/* If you already have an element that can be an accessible name for the panel */}
+  <h3 {...labelProps}>Example Panel</h3>
+</SidePanel>
+```
+
+## Static Properties
+
+#### `ToggleButton`
+> `<SidePanel.ToggleButton>` is a control that is meant to toggle between `expanded = true` and `expanded = false` states. It must be used within the `SidePanel` component as a child. Use in conjunction with `useSidePanel`'s `controlProps`, otherwise it does not come with explicit `onClick` handlers.
+
+> This is a standard Canvas Kit [`IconButton`](https://github.com/Workday/canvas-kit/tree/master/modules/button/react#iconbutton) and will accept those props.
+
+> **Important**: For accessibility purposes, it must be the first focusable element. We recommend that you keep it as the first child of `SidePanel`.
+
+## Component Props
+
+### Required
+
+> None
+
+### Optional
+
+#### `as: React.ElementType`
+> The element the side panel will render as.
+
+Default: `'section'`
+
+#### `collapsedWidth: number | string`
+> The width of the component (in `px` if it's a `number`) when it is collapsed.
+
+Default: `64`
+
+#### `expanded: boolean`
+> If true, sets the expanded state of the side panel
+
+Default: `false`
+
+#### `expandedWidth: number | string`
+> The width of the component (in `px` if it's a `number`) when it is expanded.
+
+Default: `320`
+
+#### `origin: 'left' | 'right'`
+> Which side the side panel is meant to originate from.
+
+Default: `'left'`
+
+#### `onExpandedChange: (expanded?: boolean) => void`
+> The function called when the side panel's `expanded` state changes. States like `'collapsing'` and `'expanding'` are tracked in another callback: `onStateChange`
+
+#### `onStateTransition: (state?: SidePanelTransitionStates) => void`
+> The function called when the side panel is transitioning between states. Use this to track when the side panel is animating between 'collapsed', 'collapsing', 'expanded', and 'expanding' states. This can be particularly helpful if child components need to react specifically to these states.
+
+#### `variant: SidePanelVariant`
+> The style variant of the side panel. 'standard' is with a `soap100` background, no depth. 'alternate' is a `frenchVanilla100` background with a level 3 depth.
+
+Default: `'standard'`
+

modules/_labs/side-panel/react/index.ts

@@ -0,0 +1,6 @@
+import SidePanel from './lib/SidePanel';
+import {useSidePanel} from './lib/hooks';
+
+export default SidePanel;
+export {SidePanel, useSidePanel};
+export * from './lib/SidePanel';