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app_vue/node_modules/eslint-plugin-vue/lib/rules/no-deprecated-events-api.js

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+/**
+ * @fileoverview disallow using deprecated events api
+ * @author yoyo930021
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow using deprecated events api (in Vue.js 3.0.0+)',
+      categories: ['vue3-essential'],
+      url: 'https://eslint.vuejs.org/rules/no-deprecated-events-api.html'
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      noDeprecatedEventsApi:
+        'The Events api `$on`, `$off` `$once` is deprecated. Using external library instead, for example mitt.'
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    return utils.defineVueVisitor(context, {
+      /** @param {MemberExpression & ({parent: CallExpression} | {parent: ChainExpression & {parent: CallExpression}})} node */
+      'CallExpression > MemberExpression, CallExpression > ChainExpression > MemberExpression'(
+        node
+      ) {
+        const call =
+          node.parent.type === 'ChainExpression'
+            ? node.parent.parent
+            : node.parent
+
+        if (call.optional) {
+          // It is OK because checking whether it is deprecated.
+          // e.g. `this.$on?.()`
+          return
+        }
+
+        if (
+          utils.skipChainExpression(call.callee) !== node ||
+          !['$on', '$off', '$once'].includes(
+            utils.getStaticPropertyName(node) || ''
+          )
+        ) {
+          return
+        }
+        if (!utils.isThis(node.object, context)) {
+          return
+        }
+
+        context.report({
+          node: node.property,
+          messageId: 'noDeprecatedEventsApi'
+        })
+      }
+    })
+  }
+}