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node_modules/eslint-plugin-vue/lib/rules/no-empty-component-block.js

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+/**
+ * @author tyankatsu <https://github.com/tyankatsu0105>
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const { isVElement } = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+/**
+ * check whether has attribute `src`
+ * @param {VElement} componentBlock
+ */
+function hasAttributeSrc(componentBlock) {
+  const hasAttribute = componentBlock.startTag.attributes.length > 0
+
+  const hasSrc =
+    componentBlock.startTag.attributes.filter(
+      (attribute) =>
+        !attribute.directive &&
+        attribute.key.name === 'src' &&
+        attribute.value &&
+        attribute.value.value !== ''
+    ).length > 0
+
+  return hasAttribute && hasSrc
+}
+
+/**
+ * check whether value under the component block is only whitespaces or break lines
+ * @param {VElement} componentBlock
+ */
+function isValueOnlyWhiteSpacesOrLineBreaks(componentBlock) {
+  return (
+    componentBlock.children.length === 1 &&
+    componentBlock.children[0].type === 'VText' &&
+    !componentBlock.children[0].value.trim()
+  )
+}
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description:
+        'disallow the `<template>` `<script>` `<style>` block to be empty',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/no-empty-component-block.html'
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      unexpected: '`<{{ blockName }}>` is empty. Empty block is not allowed.'
+    }
+  },
+
+  /**
+   * @param {RuleContext} context - The rule context.
+   * @returns {RuleListener} AST event handlers.
+   */
+  create(context) {
+    if (!context.parserServices.getDocumentFragment) {
+      return {}
+    }
+    const documentFragment = context.parserServices.getDocumentFragment()
+    if (!documentFragment) {
+      return {}
+    }
+
+    const componentBlocks = documentFragment.children.filter(isVElement)
+
+    return {
+      Program() {
+        for (const componentBlock of componentBlocks) {
+          if (
+            componentBlock.name !== 'template' &&
+            componentBlock.name !== 'script' &&
+            componentBlock.name !== 'style'
+          )
+            continue
+
+          // https://vue-loader.vuejs.org/spec.html#src-imports
+          if (hasAttributeSrc(componentBlock)) continue
+
+          if (
+            isValueOnlyWhiteSpacesOrLineBreaks(componentBlock) ||
+            componentBlock.children.length === 0
+          ) {
+            context.report({
+              node: componentBlock,
+              loc: componentBlock.loc,
+              messageId: 'unexpected',
+              data: {
+                blockName: componentBlock.name
+              }
+            })
+          }
+        }
+      }
+    }
+  }
+}