Adds a no-system-props rule

.changeset/gorgeous-games-confess.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-primer-react': minor
+---
+
+Added a no-system-props rule

docs/rules/no-system-props.md

@@ -0,0 +1,40 @@
+# Disallow use of styled-system props (no-system-colors)
+
+🔧 The `--fix` option on the [ESLint CLI](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) can automatically fix some of the problems reported by this rule.
+
+[Styled-system](https://styled-system.com/table) props are deprecated in Primer components (excluding utility components).
+
+## Rule details
+
+This rule disallows the use of any styled-system prop on Primer components, as the `sx` prop is now the prefered way to apply additional styling.
+
+\*The two non-deprecated utility components (`Box` and `Text`) are allowed to use system props.
+
+👎 Examples of **incorrect** code for this rule:
+
+```jsx
+/* eslint primer-react/no-system-props: "error" */
+import {Button} from '@primer/components'
+
+<Button width={200} />
+<Button width={200} sx={{height: 300}} />
+```
+
+👍 Examples of **correct** code for this rule:
+
+```jsx
+/* eslint primer-react/no-system-props: "error" */
+import {Box, Button, ProgressBar} from '@primer/components'
+import {Avatar} from 'some-other-library'
+// Non-system props are allowed
+<Button someOtherProp="foo" />
+// If you need to override styles, use the `sx` prop instead of system props
+<Button sx={{mr: 2}} />
+// Some component prop names overlap with styled-system prop names.
+// These props are still allowed
+<ProgressBar bg="success.emphasis" />
+// Utility components like Box and Text still accept system props
+<Box mr={2} />
+// System props passed to non-Primer components are allowed
+<Avatar mr={2} />
+```

package.json

@@ -34,6 +34,9 @@
   },
   "prettier": "@github/prettier-config",
   "dependencies": {
-    "eslint-traverse": "^1.0.0"
+    "@styled-system/props": "^5.1.5",
+    "eslint-traverse": "^1.0.0",
+    "lodash": "^4.17.21",
+    "styled-system": "^5.1.5"
   }
 }

src/configs/recommended.js

@@ -7,6 +7,7 @@ module.exports = {
   },
   plugins: ['primer-react'],
   rules: {
-    'primer-react/no-deprecated-colors': 'warn'
+    'primer-react/no-deprecated-colors': 'warn',
+    'primer-react/no-system-props': 'warn'
   }
 }

src/index.js

@@ -1,6 +1,7 @@
 module.exports = {
   rules: {
-    'no-deprecated-colors': require('./rules/no-deprecated-colors')
+    'no-deprecated-colors': require('./rules/no-deprecated-colors'),
+    'no-system-props': require('./rules/no-system-props')
   },
   configs: {
     recommended: require('./configs/recommended')

src/rules/__tests__/no-system-props.test.js

@@ -0,0 +1,125 @@
+const rule = require('../no-system-props')
+const {RuleTester} = require('eslint')
+
+const ruleTester = new RuleTester({
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true
+    }
+  }
+})
+
+ruleTester.run('no-system-props', rule, {
+  valid: [
+    `import {Button} from '@primer/components'; <Button sx={{width: 200}} />`,
+    `import {Button} from 'coles-cool-design-system'; <Button width={200} />`,
+    `import {Button} from '@primer/components'; <Button someOtherProp="foo" />`,
+    `import {Box} from '@primer/components'; <Box width={200} />`,
+    `import {ProgressBar} from '@primer/components'; <ProgressBar bg="howdy" />`,
+    `import {Button} from '@primer/components'; <Button {...someExpression()} />`
+  ],
+  invalid: [
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{width: 200}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width="200" />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{width: "200"}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={"200"} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{width: "200"}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={myWidth} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{width: myWidth}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} height={100} />`,
+      output: `import {Button} from '@primer/components'; <Button   sx={{width: 200, height: 100}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width, height', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} sx={{height: 200}} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{height: 200, width: 200}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} sx={{width: 300}} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{width: 300}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} sx={myStylez} />`,
+      output: `import {Button} from '@primer/components'; <Button width={200} sx={myStylez} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Button} from '@primer/components'; <Button width={200} sx={{...partialStyles, width: 100}} />`,
+      output: `import {Button} from '@primer/components'; <Button  sx={{...partialStyles, width: 100}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Button'}
+        }
+      ]
+    },
+    {
+      code: `import {Label} from '@primer/components'; <Label width={200} outline />`,
+      output: `import {Label} from '@primer/components'; <Label  outline sx={{width: 200}} />`,
+      errors: [
+        {
+          messageId: 'noSystemProps',
+          data: {propNames: 'width', componentName: 'Label'}
+        }
+      ]
+    }
+  ]
+})