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app_vue/node_modules/eslint-plugin-vue/lib/rules/v-on-style.js

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+/**
+ * @author Toru Nagashima
+ * @copyright 2017 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'enforce `v-on` directive style',
+      categories: ['vue3-strongly-recommended', 'strongly-recommended'],
+      url: 'https://eslint.vuejs.org/rules/v-on-style.html'
+    },
+    fixable: 'code',
+    schema: [{ enum: ['shorthand', 'longform'] }]
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const preferShorthand = context.options[0] !== 'longform'
+
+    return utils.defineTemplateBodyVisitor(context, {
+      /** @param {VDirective} node */
+      "VAttribute[directive=true][key.name.name='on'][key.argument!=null]"(
+        node
+      ) {
+        const shorthand = node.key.name.rawName === '@'
+        if (shorthand === preferShorthand) {
+          return
+        }
+
+        const pos = node.range[0]
+        context.report({
+          node,
+          loc: node.loc,
+          message: preferShorthand
+            ? "Expected '@' instead of 'v-on:'."
+            : "Expected 'v-on:' instead of '@'.",
+          fix: (fixer) =>
+            preferShorthand
+              ? fixer.replaceTextRange([pos, pos + 5], '@')
+              : fixer.replaceTextRange([pos, pos + 1], 'v-on:')
+        })
+      }
+    })
+  }
+}