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app_vue/node_modules/eslint-plugin-vue/lib/rules/valid-template-root.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: 'problem',
+    docs: {
+      description: 'enforce valid template root',
+      categories: ['vue3-essential', 'essential'],
+      url: 'https://eslint.vuejs.org/rules/valid-template-root.html'
+    },
+    fixable: null,
+    schema: []
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const sourceCode = context.getSourceCode()
+
+    return {
+      /** @param {Program} program */
+      Program(program) {
+        const element = program.templateBody
+        if (element == null) {
+          return
+        }
+
+        const hasSrc = utils.hasAttribute(element, 'src')
+        const rootElements = []
+
+        for (const child of element.children) {
+          if (sourceCode.getText(child).trim() !== '') {
+            rootElements.push(child)
+          }
+        }
+
+        if (hasSrc && rootElements.length) {
+          for (const element of rootElements) {
+            context.report({
+              node: element,
+              loc: element.loc,
+              message:
+                "The template root with 'src' attribute is required to be empty."
+            })
+          }
+        } else if (rootElements.length === 0 && !hasSrc) {
+          context.report({
+            node: element,
+            loc: element.loc,
+            message: 'The template requires child element.'
+          })
+        }
+      }
+    }
+  }
+}