[no-deprecated-colors] Handle sx prop edge cases

.changeset/weak-tips-brush.md

@@ -0,0 +1,17 @@
+---
+"eslint-plugin-primer-react": patch
+---
+
+The `no-deprecated-colors` rule can now find deprecated colors in the following cases:
+
+* Nested `sx` properties:
+
+   ```jsx
+  <Box sx={{'&:hover': {bg: 'bg.primary'}}}>
+   ```
+
+* Functions in `sx` prop:
+
+   ```jsx
+  <Box sx={{boxShadow: theme => `0 1px 2px ${theme.colors.text.primary}`}}>
+   ```

package.json

@@ -32,5 +32,8 @@
     "eslint": ">=4.19.0",
     "@primer/primitives": ">=4.6.2"
   },
-  "prettier": "@github/prettier-config"
+  "prettier": "@github/prettier-config",
+  "dependencies": {
+    "eslint-traverse": "^1.0.0"
+  }
 }

src/rules/__tests__/no-deprecated-colors.test.js

@@ -79,6 +79,42 @@ ruleTester.run('no-deprecated-colors', rule, {
         }
       ]
     },
+    {
+      code: `import {Box} from "@primer/components"; <Box sx={{boxShadow: theme => theme.shadows.autocomplete.shadow}} />`,
+      output: `import {Box} from "@primer/components"; <Box sx={{boxShadow: theme => theme.shadows.shadow.medium}} />`,
+      errors: [
+        {
+          message: '"theme.shadows.autocomplete.shadow" is deprecated. Use "theme.shadows.shadow.medium" instead.'
+        }
+      ]
+    },
+    {
+      code: `import {Box} from "@primer/components"; <Box sx={{boxShadow: theme => \`0 1px 2px \${theme.colors.text.primary}\`}} />`,
+      output: `import {Box} from "@primer/components"; <Box sx={{boxShadow: theme => \`0 1px 2px \${theme.colors.fg.default}\`}} />`,
+      errors: [
+        {
+          message: '"theme.colors.text.primary" is deprecated. Use "theme.colors.fg.default" instead.'
+        }
+      ]
+    },
+    {
+      code: `import {Box} from "@primer/components"; <Box sx={{boxShadow: t => \`0 1px 2px \${t.colors.text.primary}\`}} />`,
+      output: `import {Box} from "@primer/components"; <Box sx={{boxShadow: t => \`0 1px 2px \${t.colors.fg.default}\`}} />`,
+      errors: [
+        {
+          message: '"t.colors.text.primary" is deprecated. Use "t.colors.fg.default" instead.'
+        }
+      ]
+    },
+    {
+      code: `import {Box} from "@primer/components"; <Box sx={{"&:hover": {bg: "bg.primary"}}} />`,
+      output: `import {Box} from "@primer/components"; <Box sx={{"&:hover": {bg: "canvas.default"}}} />`,
+      errors: [
+        {
+          message: '"bg.primary" is deprecated. Use "canvas.default" instead.'
+        }
+      ]
+    },
     {
       code: `import {Box} from "@primer/components"; <Box color="auto.green.5" />`,
       errors: [

src/rules/no-deprecated-colors.js

@@ -1,4 +1,5 @@
 const deprecations = require('@primer/primitives/dist/deprecations/colors')
+const traverse = require('eslint-traverse')
 
 const styledSystemColorProps = ['color', 'bg', 'backgroundColor', 'borderColor', 'textShadow', 'boxShadow']
 
@@ -25,19 +26,46 @@ module.exports = {
 
           // Check for the sx prop
           if (propName === 'sx' && attribute.value.expression.type === 'ObjectExpression') {
-            // Ignore non-literal properties
-            const sxProperties = attribute.value.expression.properties.filter(
-              property => property.type === 'Property' && property.value.type === 'Literal'
-            )
-
-            for (const prop of sxProperties) {
-              const propName = prop.key.name
-              const propValue = prop.value.value
+            // Search all properties of the sx object (even nested properties)
+            traverse(context, attribute.value, path => {
+              if (path.node.type === 'Property' && path.node.value.type === 'Literal') {
+                const prop = path.node
+                const propName = prop.key.name
+                const propValue = prop.value.value
+
+                if (styledSystemColorProps.includes(propName) && Object.keys(deprecations).includes(propValue)) {
+                  replaceDeprecatedColor(context, prop.value, propValue)
+                }
+              }
 
-              if (styledSystemColorProps.includes(propName) && Object.keys(deprecations).includes(propValue)) {
-                replaceDeprecatedColor(context, prop.value, propValue)
+              // Check functions passed to sx object properties
+              // (e.g. boxShadow: theme => `0 1px 2px ${theme.colors.text.primary}` )
+              if (path.node.type === 'Property' && path.node.value.type === 'ArrowFunctionExpression') {
+                traverse(context, path.node.value.body, path => {
+                  if (path.node.type === 'MemberExpression') {
+                    // Convert MemberExpression AST to string
+                    const code = context.getSourceCode().getText(path.node)
+
+                    const [param, key, ...rest] = code.split('.')
+                    const name = rest.join('.')
+
+                    if (['colors', 'shadows'].includes(key) && Object.keys(deprecations).includes(name)) {
+                      replaceDeprecatedColor(
+                        context,
+                        path.node,
+                        name,
+                        str => [param, key, str].join('.'),
+                        str => str
+                      )
+                    }
+
+                    // Don't traverse any nested member expressions.
+                    // The root-level member expression gives us all the data we need.
+                    return traverse.SKIP
+                  }
+                })
               }
-            }
+            })
           }
 
           // Check if styled-system color prop is using a deprecated color
@@ -103,36 +131,42 @@ function isGet(identifier, scope) {
   return isImportedFrom(/^\.\.?\/constants$/, identifier, scope) && identifier.name === 'get'
 }
 
-function replaceDeprecatedColor(context, node, deprecatedName, getDisplayName = str => str) {
+function replaceDeprecatedColor(
+  context,
+  node,
+  deprecatedName,
+  transformName = str => str,
+  transformReplacementValue = str => JSON.stringify(str)
+) {
   const replacement = deprecations[deprecatedName]
 
   if (replacement === null) {
     // No replacement
     context.report({
       node,
-      message: `"${getDisplayName(
+      message: `"${transformName(
         deprecatedName
       )}" is deprecated. Go to https://primer.style/primitives or reach out in the #primer channel on Slack to find a suitable replacement.`
     })
   } else if (Array.isArray(replacement)) {
     // Multiple possible replacements
     context.report({
       node,
-      message: `"${getDisplayName(deprecatedName)}" is deprecated.`,
+      message: `"${transformName(deprecatedName)}" is deprecated.`,
       suggest: replacement.map(replacementValue => ({
-        desc: `Use "${getDisplayName(replacementValue)}" instead.`,
+        desc: `Use "${transformName(replacementValue)}" instead.`,
         fix(fixer) {
-          return fixer.replaceText(node, JSON.stringify(getDisplayName(replacementValue)))
+          return fixer.replaceText(node, transformReplacementValue(transformName(replacementValue)))
         }
       }))
     })
   } else {
     // One replacement
     context.report({
       node,
-      message: `"${getDisplayName(deprecatedName)}" is deprecated. Use "${getDisplayName(replacement)}" instead.`,
+      message: `"${transformName(deprecatedName)}" is deprecated. Use "${transformName(replacement)}" instead.`,
       fix(fixer) {
-        return fixer.replaceText(node, JSON.stringify(getDisplayName(replacement)))
+        return fixer.replaceText(node, transformReplacementValue(transformName(replacement)))
       }
     })
   }