feat(IdPrefix): add component, docs, tests

packages/react/__tests__/__snapshots__/PublicAPI-test.js.snap

@@ -3935,6 +3935,16 @@ Map {
     },
     "render": [Function],
   },
+  "IdPrefix" => Object {
+    "propTypes": Object {
+      "children": Object {
+        "type": "node",
+      },
+      "prefix": Object {
+        "type": "string",
+      },
+    },
+  },
   "InlineLoading" => Object {
     "propTypes": Object {
       "className": Object {
@@ -9984,6 +9994,7 @@ Map {
   "unstable_useFeatureFlag" => Object {},
   "unstable_useFeatureFlags" => Object {},
   "unstable_useLayoutDirection" => Object {},
+  "useIdPrefix" => Object {},
   "useLayer" => Object {},
   "usePrefix" => Object {},
   "useTheme" => Object {},

packages/react/src/__tests__/index-test.js

@@ -87,6 +87,7 @@ describe('Carbon Components React', () => {
         "IconButton",
         "IconSkeleton",
         "IconTab",
+        "IdPrefix",
         "InlineLoading",
         "InlineNotification",
         "Layer",
@@ -248,6 +249,7 @@ describe('Carbon Components React', () => {
         "unstable_useFeatureFlag",
         "unstable_useFeatureFlags",
         "unstable_useLayoutDirection",
+        "useIdPrefix",
         "useLayer",
         "usePrefix",
         "useTheme",

packages/react/src/components/IdPrefix/IdPrefix.mdx

@@ -0,0 +1,56 @@
+import { Story, Props, Source, Preview } from '@storybook/addon-docs/blocks';
+import { IdPrefix } from '../IdPrefix';
+
+# Prefix
+
+[Source code](https://github.com/carbon-design-system/carbon/tree/main/packages/react/src/components/ClassPrefix)
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+## Table of Contents
+
+- [Overview](#overview)
+- [Component API](#component-api)
+- [Feedback](#feedback)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+## Overview
+
+The `IdPrefix` component is used to change the prefix applied to the
+automatically generated `id` attributes placed on certain DOM elements.
+
+<Preview>
+  <Story id="components-idprefix--default" />
+</Preview>
+
+This component is used intended to be used in limited cases, primarily only if
+you have id conflics when using v10 and v11 packages at the same time during
+migration.
+
+In React, you can use `IdPrefix` anywhere in your component tree and specify the
+prefix with the `prefix` prop. Most often it's used in the project root wrapping
+the entire project:
+
+```jsx
+import { IdPrefix } from '@carbon/react';
+
+export default function MyApp() {
+  return (
+    <IdPrefix prefix="custom">
+      <Page />
+    </IdPrefix>
+  );
+}
+```
+
+## Component API
+
+<Props />
+
+## Feedback
+
+Help us improve this component by providing feedback, asking questions on Slack,
+or updating this file on
+[GitHub](https://github.com/carbon-design-system/carbon/edit/main/packages/react/src/components/ClassPrefix/ClassPrefix.mdx).

packages/react/src/components/IdPrefix/IdPrefix.stories.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright IBM Corp. 2016, 2018
+ *
+ * This source code is licensed under the Apache-2.0 license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import { IdPrefix } from '.';
+import { useIdPrefix } from '../../internal/useIdPrefix';
+import mdx from './IdPrefix.mdx';
+
+export default {
+  title: 'Components/IdPrefix',
+  component: IdPrefix,
+  parameters: {
+    docs: {
+      page: mdx,
+    },
+  },
+};
+
+export const Default = () => {
+  function ExampleComponent() {
+    const idPrefix = useIdPrefix();
+    return <p>The current id prefix is: {idPrefix}</p>;
+  }
+
+  return (
+    <>
+      <ExampleComponent />
+      <IdPrefix prefix="custom">
+        <ExampleComponent />
+      </IdPrefix>
+    </>
+  );
+};

packages/react/src/components/IdPrefix/__tests__/IdPrefix-test.js

@@ -0,0 +1,31 @@
+/**
+ * Copyright IBM Corp. 2016, 2018
+ *
+ * This source code is licensed under the Apache-2.0 license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { render } from '@testing-library/react';
+import React from 'react';
+import { IdPrefix } from '../../IdPrefix';
+import { useIdPrefix } from '../../../internal/useIdPrefix';
+
+describe('IdPrefix', () => {
+  it('should set the prefix value used by usePrefix', () => {
+    const calls = [];
+
+    function TestComponent() {
+      const prefix = useIdPrefix();
+      calls.push(prefix);
+      return null;
+    }
+
+    render(
+      <IdPrefix prefix="custom">
+        <TestComponent />
+      </IdPrefix>
+    );
+
+    expect(calls).toEqual(['custom']);
+  });
+});

packages/react/src/components/IdPrefix/index.js

@@ -0,0 +1,29 @@
+/**
+ * Copyright IBM Corp. 2016, 2018
+ *
+ * This source code is licensed under the Apache-2.0 license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import PropTypes from 'prop-types';
+import React from 'react';
+import { IdPrefixContext } from '../../internal/useIdPrefix';
+
+function IdPrefix({ children, prefix }) {
+  return (
+    <IdPrefixContext.Provider value={prefix}>
+      {children}
+    </IdPrefixContext.Provider>
+  );
+}
+
+IdPrefix.propTypes = {
+  children: PropTypes.node,
+
+  /**
+   * The value used to prefix the auto-generated id placed on some DOM elements
+   */
+  prefix: PropTypes.string,
+};
+
+export { IdPrefix };

packages/react/src/index.js

@@ -71,6 +71,7 @@ export FormGroup from './components/FormGroup';
 export FormItem from './components/FormItem';
 export FormLabel from './components/FormLabel';
 export { Grid, Row, Column, ColumnHang, FlexGrid } from './components/Grid';
+export { IdPrefix } from './components/IdPrefix';
 export InlineLoading from './components/InlineLoading';
 export Link from './components/Link';
 export ListItem from './components/ListItem';
@@ -271,3 +272,4 @@ export {
 export { DefinitionTooltip } from './components/Tooltip/next/DefinitionTooltip';
 export { GlobalTheme, Theme, useTheme } from './components/Theme';
 export { usePrefix } from './internal/usePrefix';
+export { useIdPrefix } from './internal/useIdPrefix';

packages/react/src/internal/__tests__/useIdPrefix-test.js

@@ -0,0 +1,41 @@
+/**
+ * Copyright IBM Corp. 2020
+ *
+ * This source code is licensed under the Apache-2.0 license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { cleanup, render } from '@testing-library/react';
+import React from 'react';
+import { useIdPrefix, IdPrefixContext } from '../useIdPrefix';
+
+describe('usePrefix', () => {
+  afterEach(cleanup);
+
+  it('should emit the default prefix without context', () => {
+    let value = null;
+
+    function TestComponent() {
+      value = useIdPrefix();
+      return null;
+    }
+
+    render(<TestComponent />);
+    expect(value).toBe(null);
+  });
+
+  it('should emit the prefix in context', () => {
+    function TestComponent() {
+      const contextValue = useIdPrefix();
+      return <span data-testid="test">{contextValue}</span>;
+    }
+
+    const { getByTestId } = render(
+      <IdPrefixContext.Provider value="test">
+        <TestComponent />
+      </IdPrefixContext.Provider>
+    );
+
+    expect(getByTestId('test')).toHaveTextContent('test');
+  });
+});

packages/react/src/internal/__tests__/usePrefix-test.js

@@ -26,7 +26,8 @@ describe('usePrefix', () => {
 
   it('should emit the prefix in context', () => {
     function TestComponent() {
-      return <span data-testid="test">test</span>;
+      const contextValue = usePrefix();
+      return <span data-testid="test">{contextValue}</span>;
     }
 
     const { getByTestId } = render(

packages/react/src/internal/useId.js

@@ -26,6 +26,7 @@
 import { useEffect, useLayoutEffect, useState } from 'react';
 import setupGetInstanceId from '../tools/setupGetInstanceId';
 import { canUseDOM } from './environment';
+import { useIdPrefix } from './useIdPrefix';
 
 const getId = setupGetInstanceId();
 const useIsomorphicLayoutEffect = canUseDOM ? useLayoutEffect : useEffect;
@@ -38,16 +39,18 @@ let serverHandoffCompleted = false;
  * @returns {string}
  */
 export function useId(prefix = 'id') {
+  const _prefix = useIdPrefix();
+
   const [id, setId] = useState(() => {
     if (serverHandoffCompleted) {
-      return `${prefix}-${getId()}`;
+      return `${_prefix ? `${_prefix}-` : ``}${prefix}-${getId()}`;
     }
     return null;
   });
 
   useIsomorphicLayoutEffect(() => {
     if (id === null) {
-      setId(`${prefix}-${getId()}`);
+      setId(`${_prefix ? `${_prefix}-` : ``}${prefix}-${getId()}`);
     }
   }, [getId]);
 

packages/react/src/internal/useIdPrefix.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright IBM Corp. 2016, 2018
+ *
+ * This source code is licensed under the Apache-2.0 license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+export const IdPrefixContext = React.createContext(null);
+
+export function useIdPrefix() {
+  return React.useContext(IdPrefixContext);
+}