⭐️ New: Add rule no-reserved-component-names (#757)

* ⭐ add rule no-reserved-component-names

* Increase test coverage

* Checking elements against element lists

* 🔨 Update PR with ota-meshi suggestions

* 🔨 Lint locally registered components

* 👌 Adding tests to validate slot and template

* 🔨 Linting for deprecated elements

docs/rules/no-reserved-component-names.md

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+# vue/no-reserved-component-names
+> disallow the use of reserved names in component definitions
+
+- :gear: This rule is included in all of `"plugin:vue/essential"`, `"plugin:vue/recommended"`, and `"plugin:vue/strongly-recommended"`.
+
+## :book: Rule Details
+
+This rule prevents name collisions between vue components and standard html elements. 
+
+<eslint-code-block :rules="{'vue/no-reserved-component-names': ['error']}">
+
+```vue
+<script>
+/* ✗ BAD */
+export default {
+  name: 'div'
+}
+</script>
+```
+
+</eslint-code-block>
+
+## :books: Further reading
+
+- [List of html elements](https://developer.mozilla.org/en-US/docs/Web/HTML/Element)
+- [List of SVG elements](https://developer.mozilla.org/en-US/docs/Web/SVG/Element)
+- [Kebab case elements](https://stackoverflow.com/questions/22545621/do-custom-elements-require-a-dash-in-their-name/22545622#22545622)
+- [Valid custom element name](https://w3c.github.io/webcomponents/spec/custom/#valid-custom-element-name)

lib/rules/no-reserved-component-names.js

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+/**
+ * @fileoverview disallow the use of reserved names in component definitions
+ * @author Jake Hassel <https://github.com/shadskii>
+ */
+'use strict'
+
+const utils = require('../utils')
+const casing = require('../utils/casing')
+
+const htmlElements = require('../utils/html-elements.json')
+const deprecatedHtmlElements = require('../utils/deprecated-html-elements.json')
+const svgElements = require('../utils/svg-elements.json')
+
+const kebabCaseElements = [
+  'annotation-xml',
+  'color-profile',
+  'font-face',
+  'font-face-src',
+  'font-face-uri',
+  'font-face-format',
+  'font-face-name',
+  'missing-glyph'
+]
+
+const isLowercase = (word) => /^[a-z]*$/.test(word)
+const capitalizeFirstLetter = (word) => word[0].toUpperCase() + word.substring(1, word.length)
+
+const RESERVED_NAMES = new Set(
+  [
+    ...kebabCaseElements,
+    ...kebabCaseElements.map(casing.pascalCase),
+    ...htmlElements,
+    ...htmlElements.map(capitalizeFirstLetter),
+    ...deprecatedHtmlElements,
+    ...deprecatedHtmlElements.map(capitalizeFirstLetter),
+    ...svgElements,
+    ...svgElements.filter(isLowercase).map(capitalizeFirstLetter)
+  ])
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'disallow the use of reserved names in component definitions',
+      category: undefined, // 'essential'
+      url: 'https://eslint.vuejs.org/rules/no-reserved-component-names.html'
+    },
+    fixable: null,
+    schema: []
+  },
+
+  create (context) {
+    function canVerify (node) {
+      return node.type === 'Literal' || (
+        node.type === 'TemplateLiteral' &&
+        node.expressions.length === 0 &&
+        node.quasis.length === 1
+      )
+    }
+
+    function reportIfInvalid (node) {
+      let name
+      if (node.type === 'TemplateLiteral') {
+        const quasis = node.quasis[0]
+        name = quasis.value.cooked
+      } else {
+        name = node.value
+      }
+      if (RESERVED_NAMES.has(name)) {
+        report(node, name)
+      }
+    }
+
+    function report (node, name) {
+      context.report({
+        node: node,
+        message: 'Name "{{name}}" is reserved.',
+        data: {
+          name: name
+        }
+      })
+    }
+
+    return Object.assign({},
+      {
+        "CallExpression > MemberExpression > Identifier[name='component']" (node) {
+          const parent = node.parent.parent
+          const calleeObject = utils.unwrapTypes(parent.callee.object)
+
+          if (calleeObject.type === 'Identifier' &&
+              calleeObject.name === 'Vue' &&
+              parent.arguments &&
+              parent.arguments.length === 2
+          ) {
+            const argument = parent.arguments[0]
+
+            if (canVerify(argument)) {
+              reportIfInvalid(argument)
+            }
+          }
+        }
+      },
+      utils.executeOnVue(context, (obj) => {
+        // Report if a component has been registered locally with a reserved name.
+        utils.getRegisteredComponents(obj)
+          .filter(({ name }) => RESERVED_NAMES.has(name))
+          .forEach(({ node, name }) => report(node, name))
+
+        const node = obj.properties
+          .find(item => (
+            item.type === 'Property' &&
+            item.key.name === 'name' &&
+            canVerify(item.value)
+          ))
+
+        if (!node) return
+        reportIfInvalid(node.value)
+      })
+    )
+  }
+}

lib/utils/deprecated-html-elements.json

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+["acronym","applet","basefont","bgsound","big","blink","center","command","content","dir","element","font","frame","frameset","image","isindex","keygen","listing","marquee","menuitem","multicol","nextid","nobr","noembed","noframes","plaintext","shadow","spacer","strike","tt","xmp"]