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app_vue/node_modules/eslint-plugin-vue/lib/rules/no-arrow-functions-in-watch.js

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+/**
+ * @author Sosuke Suzuki
+ */
+'use strict'
+
+const utils = require('../utils')
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow using arrow functions to define watcher',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/no-arrow-functions-in-watch.html'
+    },
+    fixable: null,
+    schema: []
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    return utils.executeOnVue(context, (obj) => {
+      const watchNode = utils.findProperty(obj, 'watch')
+      if (watchNode == null) {
+        return
+      }
+      const watchValue = watchNode.value
+      if (watchValue.type !== 'ObjectExpression') {
+        return
+      }
+      for (const property of watchValue.properties) {
+        if (property.type !== 'Property') {
+          continue
+        }
+
+        for (const handler of utils.iterateWatchHandlerValues(property)) {
+          if (handler.type === 'ArrowFunctionExpression') {
+            context.report({
+              node: handler,
+              message:
+                'You should not use an arrow function to define a watcher.'
+            })
+          }
+        }
+      }
+    })
+  }
+}