Add an eslint rule for checking interactivity of tooltip trigger

.changeset/fair-panthers-raise.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-primer-react': major
+---
+
+Add `a11y-tooltip-non-interactive-trigger`

README.md

@@ -32,3 +32,4 @@ ESLint rules for Primer React
 - [direct-slot-children](https://github.com/primer/eslint-plugin-primer-react/blob/main/docs/rules/direct-slot-children.md)
 - [no-deprecated-colors](https://github.com/primer/eslint-plugin-primer-react/blob/main/docs/rules/no-deprecated-colors.md)
 - [no-system-props](https://github.com/primer/eslint-plugin-primer-react/blob/main/docs/rules/no-system-props.md)
+- [a11y-tooltip-non-interactive-trigger](https://github.com/primer/eslint-plugin-primer-react/blob/main/docs/rules/a11y-tooltip-non-interactive-trigger.md)

docs/rules/a11y-tooltip-non-interactive-trigger.md

@@ -0,0 +1,41 @@
+## Rule Details
+
+This rule enforces to use interactive elements as tooltip triggers. Interactive elements can be Primer `Button`, `IconButton` and `Link` components or native elements like `button`, `a` with an `href` attribute, `select`, `textarea`, `summary` and `input` (that is not a `hidden` type).
+
+👎 Examples of **incorrect** code for this rule:
+
+```jsx
+/* eslint primer-react/a11y-tooltip-non-interactive-trigger: "error" */
+import {Tooltip} from '@primer/react'
+
+const App = () => (
+  <Tooltip text="Tooltip text">
+    <div>Tooltip trigger</div>
+  </Tooltip>
+)
+```
+
+👍 Examples of **correct** code for this rule:
+
+```jsx
+/* eslint primer-react/a11y-tooltip-non-interactive-trigger: "error" */
+import {Tooltip, Button} from '@primer/react'
+
+const App = () => (
+  <Tooltip text="Supplementary text" type="description">
+    <Button
+      onClick={() => {
+        /* do something */
+      }}
+    >
+      Save
+    </Button>
+  </Tooltip>
+)
+```
+
+## Options
+
+- `skipImportCheck` (default: `false`)
+
+  By default, the `a11y-tooltip-non-interactive-trigger` rule will only check for interactive elements in components that are imported from `@primer/react`. You can disable this behavior by setting `skipImportCheck` to `true`. This is used for internal linting in the [primer/react](https://github.com/prime/react) repository.

src/configs/recommended.js

@@ -10,7 +10,8 @@ module.exports = {
   rules: {
     'primer-react/direct-slot-children': 'error',
     'primer-react/no-deprecated-colors': 'warn',
-    'primer-react/no-system-props': 'warn'
+    'primer-react/no-system-props': 'warn',
+    'primer-react/a11y-tooltip-non-interactive-trigger': 'error'
   },
   settings: {
     github: {

src/index.js

@@ -2,7 +2,8 @@ module.exports = {
   rules: {
     'direct-slot-children': require('./rules/direct-slot-children'),
     'no-deprecated-colors': require('./rules/no-deprecated-colors'),
-    'no-system-props': require('./rules/no-system-props')
+    'no-system-props': require('./rules/no-system-props'),
+    'a11y-tooltip-non-interactive-trigger': require('./rules/a11y-tooltip-non-interactive-trigger')
   },
   configs: {
     recommended: require('./configs/recommended')

src/rules/__tests__/a11y-tooltip-non-interactive-trigger.test.js

@@ -0,0 +1,167 @@
+const rule = require('../a11y-tooltip-non-interactive-trigger')
+const {RuleTester} = require('eslint')
+
+const ruleTester = new RuleTester({
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true
+    }
+  }
+})
+
+ruleTester.run('non-interactive-tooltip-trigger', rule, {
+  valid: [
+    `import {Tooltip, Button} from '@primer/react';
+    <Tooltip aria-label="Filter vegetarian options" direction="e">
+      <Button>🥦</Button>
+    </Tooltip>`,
+
+    `import {Tooltip, Button} from '@primer/react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <Button>Save</Button>
+    </Tooltip>`,
+
+    `import {Tooltip, IconButton} from '@primer/react';
+    import {SearchIcon} from '@primer/octicons-react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <IconButton icon={SearchIcon} aria-label="Search" />
+    </Tooltip>`,
+
+    `import {Tooltip, Button} from '@primer/react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <div>
+        <Button>Save</Button>
+      </div>
+    </Tooltip>`,
+
+    `import {Tooltip, Button} from '@primer/react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <div>
+        <a href="https://gthub.com">Save</a>
+      </div>
+    </Tooltip>`,
+
+    `import {Tooltip} from '@primer/react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <a href="https://github.com">see commit message</a>
+    </Tooltip>`,
+
+    `import {Tooltip, Link} from '@primer/react';
+    <Tooltip aria-label="Supplementary text" direction="e">
+      <Link href="https://github.com">Link</Link>
+    </Tooltip>`
+  ],
+  invalid: [
+    {
+      code: `import {Tooltip} from '@primer/react';<Tooltip type="description" text="supportive text" direction="e"><button>button1</button><button>button2</button></Tooltip>
+      `,
+      errors: [
+        {
+          messageId: 'singleChild'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip} from '@primer/react';
+      <Tooltip aria-label="Filter vegetarian options" direction="e">
+        <span>non interactive element</span>
+      </Tooltip>
+      `,
+      errors: [
+        {
+          messageId: 'nonInteractiveTrigger'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip, Button} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <h1>Save</h1>
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'nonInteractiveTrigger'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <a>see commit message</a>
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'anchorTagWithoutHref'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip, Link} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <Link>see commit message</Link>
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'anchorTagWithoutHref'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <input type="hidden" />
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'hiddenInput'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip, TextInput} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <TextInput type="hidden" aria-label="Zipcode" name="zipcode" placeholder="Zipcode" autoComplete="postal-code" />
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'hiddenInput'
+        }
+      ]
+    },
+    {
+      code: `
+      import {Tooltip, Button} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <header>
+          <span>Save</span>
+        </header>
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'nonInteractiveTrigger'
+        }
+      ]
+    },
+    {
+      code: `import {Tooltip, Button} from '@primer/react';
+      <Tooltip aria-label="Supplementary text" direction="e">
+        <h1>
+          <a>Save</a>
+        </h1>
+      </Tooltip>`,
+      errors: [
+        {
+          messageId: 'anchorTagWithoutHref'
+        }
+      ]
+    }
+  ]
+})