Add support for props destructure to vue/require-valid-default-prop rule

Author: ota-meshi

lib/rules/require-valid-default-prop.js

@@ -70,6 +70,59 @@ function getTypes(targetNode) {
   return []
 }
 
+/**
+ * Extracts default definitions using assignment patterns.
+ * @param {CallExpression} node The node of defineProps
+ * @returns { { [key: string]: Expression | undefined } }
+ */
+function getDefaultsPropExpressionsForAssignmentPatterns(node) {
+  const left = getLeftOfDefineProps(node)
+  if (!left || left.type !== 'ObjectPattern') {
+    return {}
+  }
+  /** @type { { [key: string]: Expression | undefined } } */
+  const result = Object.create(null)
+  for (const prop of left.properties) {
+    if (prop.type !== 'Property') continue
+    const value = prop.value
+    if (value.type !== 'AssignmentPattern') continue
+    const defaultNode = value.right
+    const name = utils.getStaticPropertyName(prop)
+    if (name != null) {
+      result[name] = defaultNode
+    }
+  }
+  return result
+}
+
+/**
+ * Gets the pattern of the left operand of defineProps.
+ * @param {CallExpression} node The node of defineProps
+ * @returns {Pattern | null} The pattern of the left operand of defineProps
+ */
+function getLeftOfDefineProps(node) {
+  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) {
+    return null
+  }
+  if (
+    target.parent.type === 'VariableDeclarator' &&
+    target.parent.init === target
+  ) {
+    return target.parent.id
+  }
+  return null
+}
+
 module.exports = {
   meta: {
     type: 'suggestion',
@@ -250,71 +303,81 @@ module.exports = {
     }
 
     /**
-     * @param {(ComponentObjectDefineProp | ComponentTypeProp | ComponentInferTypeProp)[]} props
-     * @param { { [key: string]: Expression | undefined } } withDefaults
+     * @param {(ComponentObjectProp | ComponentTypeProp | ComponentInferTypeProp)[]} props
+     * @param {(propName: string) => Expression[]} otherDefaultProvider
      */
-    function processPropDefs(props, withDefaults) {
+    function processPropDefs(props, otherDefaultProvider) {
       /** @type {PropDefaultFunctionContext[]} */
       const propContexts = []
       for (const prop of props) {
         let typeList
-        let defExpr
+        /** @type {Expression[]} */
+        const defExprList = []
         if (prop.type === 'object') {
-          const type = getPropertyNode(prop.value, 'type')
-          if (!type) continue
+          if (prop.value.type === 'ObjectExpression') {
+            const type = getPropertyNode(prop.value, 'type')
+            if (!type) continue
 
-          typeList = getTypes(type.value)
+            typeList = getTypes(type.value)
 
-          const def = getPropertyNode(prop.value, 'default')
-          if (!def) continue
+            const def = getPropertyNode(prop.value, 'default')
+            if (!def) continue
 
-          defExpr = def.value
+            defExprList.push(def.value)
+          } else {
+            typeList = getTypes(prop.value)
+          }
         } else {
           typeList = prop.types
-          defExpr = withDefaults[prop.propName]
         }
-        if (!defExpr) continue
+        if (prop.propName != null) {
+          defExprList.push(...otherDefaultProvider(prop.propName))
+        }
+
+        if (defExprList.length === 0) continue
 
         const typeNames = new Set(
           typeList.filter((item) => NATIVE_TYPES.has(item))
         )
         // There is no native types detected
         if (typeNames.size === 0) continue
 
-        const defType = getValueType(defExpr)
+        for (const defExpr of defExprList) {
+          const defType = getValueType(defExpr)
 
-        if (!defType) continue
+          if (!defType) continue
 
-        if (defType.function) {
-          if (typeNames.has('Function')) {
-            continue
-          }
-          if (defType.expression) {
-            if (!defType.returnType || typeNames.has(defType.returnType)) {
+          if (defType.function) {
+            if (typeNames.has('Function')) {
               continue
             }
-            report(defType.functionBody, prop, typeNames)
+            if (defType.expression) {
+              if (!defType.returnType || typeNames.has(defType.returnType)) {
+                continue
+              }
+              report(defType.functionBody, prop, typeNames)
+            } else {
+              propContexts.push({
+                prop,
+                types: typeNames,
+                default: defType
+              })
+            }
           } else {
-            propContexts.push({
+            if (
+              typeNames.has(defType.type) &&
+              !FUNCTION_VALUE_TYPES.has(defType.type)
+            ) {
+              continue
+            }
+            report(
+              defExpr,
               prop,
-              types: typeNames,
-              default: defType
-            })
-          }
-        } else {
-          if (
-            typeNames.has(defType.type) &&
-            !FUNCTION_VALUE_TYPES.has(defType.type)
-          ) {
-            continue
-          }
-          report(
-            defExpr,
-            prop,
-            [...typeNames].map((type) =>
-              FUNCTION_VALUE_TYPES.has(type) ? 'Function' : type
+              [...typeNames].map((type) =>
+                FUNCTION_VALUE_TYPES.has(type) ? 'Function' : type
+              )
             )
-          )
+          }
         }
       }
       return propContexts
@@ -364,7 +427,7 @@ module.exports = {
                 prop.type === 'object' && prop.value.type === 'ObjectExpression'
               )
           )
-          const propContexts = processPropDefs(props, {})
+          const propContexts = processPropDefs(props, () => [])
           vueObjectPropsContexts.set(obj, propContexts)
         },
         /**
@@ -402,18 +465,25 @@ module.exports = {
           const props = baseProps.filter(
             /**
              * @param {ComponentProp} prop
-             * @returns {prop is ComponentObjectDefineProp | ComponentInferTypeProp | ComponentTypeProp}
+             * @returns {prop is ComponentObjectProp | ComponentInferTypeProp | ComponentTypeProp}
              */
             (prop) =>
               Boolean(
                 prop.type === 'type' ||
                   prop.type === 'infer-type' ||
-                  (prop.type === 'object' &&
-                    prop.value.type === 'ObjectExpression')
+                  prop.type === 'object'
               )
           )
-          const defaults = utils.getWithDefaultsPropExpressions(node)
-          const propContexts = processPropDefs(props, defaults)
+          const defaultsByWithDefaults =
+            utils.getWithDefaultsPropExpressions(node)
+          const defaultsByAssignmentPatterns =
+            getDefaultsPropExpressionsForAssignmentPatterns(node)
+          const propContexts = processPropDefs(props, (propName) =>
+            [
+              defaultsByWithDefaults[propName],
+              defaultsByAssignmentPatterns[propName]
+            ].filter(utils.isDef)
+          )
           scriptSetupPropsContexts.push({ node, props: propContexts })
         },
         /**

tests/lib/rules/require-valid-default-prop.js

@@ -223,8 +223,7 @@ ruleTester.run('require-valid-default-prop', rule, {
         parser: require('@typescript-eslint/parser'),
         ecmaVersion: 6,
         sourceType: 'module'
-      },
-      errors: errorMessage('function')
+      }
     },
     {
       filename: 'test.vue',
@@ -241,8 +240,7 @@ ruleTester.run('require-valid-default-prop', rule, {
         parser: require('@typescript-eslint/parser'),
         ecmaVersion: 6,
         sourceType: 'module'
-      },
-      errors: errorMessage('function')
+      }
     },
     {
       filename: 'test.vue',
@@ -259,8 +257,7 @@ ruleTester.run('require-valid-default-prop', rule, {
         parser: require('@typescript-eslint/parser'),
         ecmaVersion: 6,
         sourceType: 'module'
-      },
-      errors: errorMessage('function')
+      }
     },
     {
       // https://github.com/vuejs/eslint-plugin-vue/issues/1853
@@ -304,6 +301,21 @@ ruleTester.run('require-valid-default-prop', rule, {
       })
       </script>`,
       ...getTypeScriptFixtureTestOptions()
+    },
+    {
+      filename: 'test.vue',
+      code: `
+      <script setup>
+        const { foo = 'abc' } = defineProps({
+          foo: {
+            type: String,
+          }
+        })
+      </script>
+      `,
+      languageOptions: {
+        parser: require('vue-eslint-parser')
+      }
     }
   ],
 
@@ -1041,6 +1053,51 @@ ruleTester.run('require-valid-default-prop', rule, {
         }
       ],
       ...getTypeScriptFixtureTestOptions()
+    },
+    {
+      filename: 'test.vue',
+      code: `
+      <script setup>
+        const { foo = 123 } = defineProps({
+          foo: String
+        })
+      </script>
+      `,
+      languageOptions: {
+        parser: require('vue-eslint-parser')
+      },
+      errors: [
+        {
+          message: "Type of the default value for 'foo' prop must be a string.",
+          line: 3
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: `
+      <script setup>
+        const { foo = 123 } = defineProps({
+          foo: {
+            type: String,
+            default: 123
+          }
+        })
+      </script>
+      `,
+      languageOptions: {
+        parser: require('vue-eslint-parser')
+      },
+      errors: [
+        {
+          message: "Type of the default value for 'foo' prop must be a string.",
+          line: 3
+        },
+        {
+          message: "Type of the default value for 'foo' prop must be a string.",
+          line: 6
+        }
+      ]
     }
   ]
 })