add basic highlight extension

docs/src/demos/Extensions/Highlight/index.spec.js

@@ -0,0 +1,51 @@
+context('/api/extensions/highlight', () => {
+  before(() => {
+    cy.visit('/api/extensions/highlight')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('the button should highlight the selected text', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('mark')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the selected text highlighted', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .type('{selectall}')
+
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('mark')
+      .should('not.exist')
+  })
+
+  it('the keyboard shortcut should highlight the selected text', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'e' })
+      .find('mark')
+      .should('contain', 'Example Text')
+  })
+
+  it('the keyboard shortcut should toggle the selected text highlighted', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'e' })
+      .trigger('keydown', { modKey: true, key: 'e' })
+      .find('mark')
+      .should('not.exist')
+  })
+})

docs/src/demos/Extensions/Highlight/index.vue

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+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().highlight().run()" :class="{ 'is-active': editor.isActive('highlight') }">
+      highlight
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor } from '@tiptap/core'
+import { EditorContent } from '@tiptap/vue'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Highlight from '@tiptap/extension-highlight'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Highlight(),
+      ],
+      content: `
+          <p>This isn’t highlighted.</s></p>
+          <p><mark>But this one is.</mark></p>
+        `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>