From c1d4a31af8ed1fdd000a5c79703756e78a44beae Mon Sep 17 00:00:00 2001
From: yosuke ota <otameshiyo23@gmail.com>
Date: Sun, 4 Jul 2021 11:14:56 +0900
Subject: [PATCH] Update `vue/no-unused-properties` rule to support `<script
 setup>`

---
 lib/rules/no-unused-properties.js       | 77 +++++++++++++++++++++++--
 tests/lib/rules/no-unused-properties.js | 12 ++++
 2 files changed, 85 insertions(+), 4 deletions(-)

diff --git a/lib/rules/no-unused-properties.js b/lib/rules/no-unused-properties.js
index be18224ed..9a38c2a75 100644
--- a/lib/rules/no-unused-properties.js
+++ b/lib/rules/no-unused-properties.js
@@ -12,9 +12,27 @@ const utils = require('../utils')
 const eslintUtils = require('eslint-utils')
 
 /**
- * @typedef {import('../utils').ComponentPropertyData} ComponentPropertyData
+ * @typedef {import('../utils').GroupName} GroupName
  * @typedef {import('../utils').VueObjectData} VueObjectData
  */
+
+/**
+ * @typedef {object} ComponentObjectPropertyData
+ * @property {string} name
+ * @property {GroupName} groupName
+ * @property {'object'} type
+ * @property {ASTNode} node
+ * @property {Property} property
+ *
+ * @typedef {object} ComponentNonObjectPropertyData
+ * @property {string} name
+ * @property {GroupName} groupName
+ * @property {'array' | 'type'} type
+ * @property {ASTNode} node
+ *
+ * @typedef { ComponentNonObjectPropertyData | ComponentObjectPropertyData } ComponentPropertyData
+ */
+
 /**
  * @typedef {object} TemplatePropertiesContainer
  * @property {UsedProperties} usedProperties
@@ -256,7 +274,7 @@ class ParamsUsedProperties {
       return param
     }
     if (this.node.params[index]) {
-      return (this.params[index] = extractParamProperties(
+      return (this.params[index] = extractParamOrVerProperties(
         this.node.params[index],
         this.context
       ))
@@ -270,7 +288,7 @@ class ParamsUsedProperties {
  * @param {RuleContext} context
  * @returns {UsedProperties}
  */
-function extractParamProperties(node, context) {
+function extractParamOrVerProperties(node, context) {
   const result = new UsedProperties()
 
   while (node.type === 'AssignmentPattern') {
@@ -826,7 +844,58 @@ module.exports = {
     }
 
     const scriptVisitor = utils.compositingVisitors(
-      {},
+      utils.defineScriptSetupVisitor(context, {
+        onDefinePropsEnter(node, props) {
+          if (!groups.has('props')) {
+            return
+          }
+          const container = getVueComponentPropertiesContainer(node)
+
+          for (const prop of props) {
+            if (!prop.propName) {
+              continue
+            }
+            if (prop.type === 'object') {
+              container.properties.push({
+                type: prop.type,
+                name: prop.propName,
+                groupName: 'props',
+                node: prop.key,
+                property: prop.node
+              })
+            } else {
+              container.properties.push({
+                type: prop.type,
+                name: prop.propName,
+                groupName: 'props',
+                node: prop.key
+              })
+            }
+          }
+          let target = node
+          if (
+            target.parent &&
+            target.parent.type === 'CallExpression' &&
+            target.parent.arguments[0] === target &&
+            target.parent.callee.type === 'Identifier' &&
+            target.parent.callee.name === 'withDefaults'
+          ) {
+            target = target.parent
+          }
+
+          if (
+            !target.parent ||
+            target.parent.type !== 'VariableDeclarator' ||
+            target.parent.init !== target
+          ) {
+            return
+          }
+
+          const pattern = target.parent.id
+          const usedProps = extractParamOrVerProperties(pattern, context)
+          container.usedPropertiesForProps.merge(usedProps)
+        }
+      }),
       utils.defineVueVisitor(context, {
         onVueObjectEnter(node) {
           const container = getVueComponentPropertiesContainer(node)
diff --git a/tests/lib/rules/no-unused-properties.js b/tests/lib/rules/no-unused-properties.js
index e52a4bbf4..f9d61e4b0 100644
--- a/tests/lib/rules/no-unused-properties.js
+++ b/tests/lib/rules/no-unused-properties.js
@@ -2400,6 +2400,18 @@ tester.run('no-unused-properties', rule, {
         "'a' of data found, but never used.",
         "'b' of data found, but never used."
       ]
+    },
+    {
+      filename: 'test.vue',
+      code: `
+      <template>
+        {{a}}
+      </template>
+      <script setup>
+      const props = defineProps(['a', 'b', 'c'])
+      props.b
+      </script>`,
+      errors: ["'c' of property found, but never used."]
     }
   ]
 })