Update

Author: ota-meshi

lib/rules/custom-event-name-casing.js

@@ -116,16 +116,14 @@ module.exports = {
       utils.compositingVisitors(
         utils.defineVueVisitor(context, {
           onSetupFunctionEnter(node, { node: vueNode }) {
-            const contextParam = node.params[1]
+            const contextParam = utils.unwrapAssignmentPattern(node.params[1])
             if (!contextParam) {
               // no arguments
               return
             }
             if (
               contextParam.type === 'RestElement' ||
-              contextParam.type === 'ArrayPattern' ||
-              contextParam.type === 'MemberExpression' ||
-              contextParam.type === 'AssignmentPattern'
+              contextParam.type === 'ArrayPattern'
             ) {
               // cannot check
               return

lib/rules/no-mutating-props.js

@@ -179,7 +179,6 @@ module.exports = {
           }
         },
         onSetupFunctionEnter(node) {
-          /** @type {Pattern} */
           const propsParam = node.params[0]
           if (!propsParam) {
             // no arguments

lib/rules/no-setup-props-destructure.js

@@ -81,16 +81,12 @@ module.exports = {
         scopeStack = { upper: scopeStack, functionNode: node }
       },
       onSetupFunctionEnter(node) {
-        const propsParam = node.params[0]
+        const propsParam = utils.unwrapAssignmentPattern(node.params[0])
         if (!propsParam) {
           // no arguments
           return
         }
-        if (
-          propsParam.type === 'RestElement' ||
-          propsParam.type === 'MemberExpression' ||
-          propsParam.type === 'AssignmentPattern'
-        ) {
+        if (propsParam.type === 'RestElement') {
           // cannot check
           return
         }

lib/rules/no-unused-properties.js

@@ -330,7 +330,7 @@ class ParamUsedProps extends UsedProps {
    */
   constructor(paramNode, context) {
     super()
-    if (paramNode.type === 'AssignmentPattern') {
+    while (paramNode.type === 'AssignmentPattern') {
       paramNode = paramNode.left
     }
     if (paramNode.type === 'RestElement' || paramNode.type === 'ArrayPattern') {

lib/utils/index.js

@@ -1418,6 +1418,7 @@ module.exports = {
    * @return {T}
    */
   unwrapTypes,
+  unwrapAssignmentPattern,
 
   /**
    * Check whether the given node is `this` or variable that stores `this`.
@@ -1566,6 +1567,22 @@ function unwrapTypes(node) {
   return node
 }
 
+/**
+ * Unwrap AssignmentPattern like "(a = 1) => ret"
+ * @param { AssignmentPattern | RestElement | ArrayPattern | ObjectPattern | Identifier } node
+ * @return { RestElement | ArrayPattern | ObjectPattern | Identifier}
+ */
+function unwrapAssignmentPattern(node) {
+  if (!node) {
+    return node
+  }
+  if (node.type === 'AssignmentPattern') {
+    // @ts-ignore
+    return unwrapAssignmentPattern(node.left)
+  }
+  return node
+}
+
 /**
  * Gets the property name of a given node.
  * @param {Property|AssignmentProperty|MethodDefinition|MemberExpression} node - The node to get.

typings/eslint-plugin-vue/util-types/ast/es-ast.d.ts

@@ -159,7 +159,7 @@ export interface FunctionDeclaration extends HasParentNode {
   async: boolean
   generator: boolean
   id: Identifier | null
-  params: Pattern[]
+  params: _FunctionParameter[]
   body: BlockStatement
 }
 export interface VariableDeclaration extends HasParentNode {
@@ -305,7 +305,7 @@ export interface FunctionExpression extends HasParentNode {
   async: boolean
   generator: boolean
   id: Identifier | null
-  params: Pattern[]
+  params: _FunctionParameter[]
   body: BlockStatement
 }
 
@@ -314,7 +314,7 @@ interface ArrowFunctionExpressionHasBlock extends HasParentNode {
   async: boolean
   generator: boolean
   id: Identifier | null
-  params: Pattern[]
+  params: _FunctionParameter[]
   body: BlockStatement
   expression: false
 }
@@ -324,7 +324,7 @@ interface ArrowFunctionExpressionNoBlock extends HasParentNode {
   async: boolean
   generator: boolean
   id: Identifier | null
-  params: Pattern[]
+  params: _FunctionParameter[]
   body: Expression
   expression: true
 }
@@ -503,3 +503,11 @@ export interface AssignmentPattern extends HasParentNode {
   left: Pattern
   right: Expression
 }
+
+type _FunctionParameter =
+  | AssignmentPattern
+  | RestElement
+  | ArrayPattern
+  | ObjectPattern
+  | Identifier
+// | TSParameterProperty;

typings/eslint-plugin-vue/util-types/ast/ts-ast.d.ts

@@ -1,6 +1,7 @@
 import { HasParentNode } from '../node'
 import * as ES from './es-ast'
 export type TSNode = TSAsExpression
+
 export interface TSAsExpression extends HasParentNode {
   type: 'TSAsExpression'
   expression: ES.Expression