New: Add vue/name-property-required rule (#945)

* New: Add `vue/name-property-required` rule

* Rename to `require-name-property`, remove literal value assertion, add docs

docs/rules/require-name-property.md

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+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/require-name-property
+description: require a component name property
+---
+# vue/require-name-property
+> require a component name property
+
+## :book: Rule Details
+
+This rule requires a `name` property to be set on components.
+
+<eslint-code-block :rules="{'vue/require-name-property': ['error']}">
+
+```vue
+<script>
+/* ✓ GOOD */
+export default {
+  name: 'OurButton'
+}
+
+/* ✗ BAD */
+export default {
+}
+
+/* ✗ BAD */
+export default {
+  notName: 'OurButton'
+}
+</script>
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+Nothing.
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/require-name-property.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/require-name-property.js)

lib/rules/require-name-property.js

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+/**
+ * @fileoverview Require a name property in Vue components
+ * @author LukeeeeBennett
+ */
+'use strict'
+
+const utils = require('../utils')
+
+function isNameProperty (node) {
+  return node.type === 'Property' &&
+    node.key.name === 'name' &&
+    !node.computed
+}
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'require a name property in Vue components',
+      category: undefined,
+      url: 'https://eslint.vuejs.org/rules/require-name-property.html'
+    },
+    fixable: null,
+    schema: []
+  },
+
+  create (context) {
+    return utils.executeOnVue(context, component => {
+      if (component.properties.some(isNameProperty)) return
+
+      context.report({
+        node: component,
+        message: 'Required name property is not set.'
+      })
+    })
+  }
+}

tests/lib/rules/require-name-property.js

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+/**
+ * @fileoverview Require a name property in Vue components
+ * @author LukeeeeBennett
+ */
+'use strict'
+
+const rule = require('../../../lib/rules/require-name-property')
+const RuleTester = require('eslint').RuleTester
+
+const parserOptions = {
+  ecmaVersion: 2018,
+  sourceType: 'module'
+}
+
+const ruleTester = new RuleTester()
+ruleTester.run('require-name-property', rule, {
+  valid: [
+    {
+      filename: 'ValidComponent.vue',
+      code: `
+        export default {
+          name: 'IssaName'
+        }
+      `,
+      parserOptions
+    },
+    {
+      filename: 'ValidComponent.vue',
+      code: `
+        export default {
+          name: undefined
+        }
+      `,
+      parserOptions
+    },
+    {
+      filename: 'ValidComponent.vue',
+      code: `
+        export default {
+          name: ''
+        }
+      `,
+      parserOptions
+    }
+  ],
+
+  invalid: [
+    {
+      filename: 'InvalidComponent.vue',
+      code: `
+        export default {
+        }
+      `,
+      parserOptions,
+      errors: [{
+        message: 'Required name property is not set.',
+        type: 'ObjectExpression'
+      }]
+    },
+    {
+      filename: 'InvalidComponent.vue',
+      code: `
+        export default {
+        nameNot: 'IssaNameNot'
+        }
+      `,
+      parserOptions,
+      errors: [{
+        message: 'Required name property is not set.',
+        type: 'ObjectExpression'
+      }]
+    },
+    {
+      filename: 'InvalidComponent.vue',
+      code: `
+        export default {
+          computed: {
+            name() { return 'name' }
+          }
+        }
+      `,
+      parserOptions,
+      errors: [{
+        message: 'Required name property is not set.',
+        type: 'ObjectExpression'
+      }]
+    },
+    {
+      filename: 'InvalidComponent.vue',
+      code: `
+        export default {
+          [name]: 'IssaName'
+        }
+      `,
+      parserOptions,
+      errors: [{
+        message: 'Required name property is not set.',
+        type: 'ObjectExpression'
+      }]
+    }
+  ]
+})