Code

editor.vue

<script setup lang="ts">
import 'prosekit/basic/style.css'

import { createEditor } from 'prosekit/core'
import { ProseKit } from 'prosekit/vue'
import { ref, watchPostEffect } from 'vue'

import { defaultContent } from './default-doc'
import { defineExtension } from './extension'

const editor = createEditor({ extension: defineExtension(), defaultContent })
const editorRef = ref<HTMLDivElement | null>(null)
watchPostEffect((onCleanup) => {
  editor.mount(editorRef.value)
  onCleanup(() => editor.unmount())
})
</script>

<template>
  <ProseKit :editor="editor">
    <div class='box-border h-full w-full min-h-36 overflow-y-hidden overflow-x-hidden rounded-md border border-solid border-gray-200 shadow dark:border-zinc-700 flex flex-col bg-white dark:bg-neutral-900'>
      <div class='relative w-full flex-1 box-border overflow-y-scroll'>
        <div ref="editorRef" class='ProseMirror box-border min-h-full px-[max(4rem,_calc(50%-20rem))] py-8 outline-none outline-0 [&_span[data-mention="user"]]:text-blue-500 [&_span[data-mention="tag"]]:text-violet-500 [&_pre]:text-white [&_pre]:bg-zinc-800' />
      </div>
    </div>
  </ProseKit>
</template>

extension.ts

import {
  defineBaseKeymap,
  defineDoc,
  defineParagraph,
  defineText,
  union,
} from 'prosekit/core'
import { defineDropCursor } from 'prosekit/extensions/drop-cursor'
import { defineImage } from 'prosekit/extensions/image'

export function defineExtension() {
  return union(
    defineBaseKeymap(),
    defineDoc(),
    defineText(),
    defineParagraph(),
    defineImage(),
    defineDropCursor({
      color: false,
      width: 4,
      class: 'transition-all bg-blue-500',
    }),
  )
}

export type EditorExtension = ReturnType<typeof defineExtension>

default-doc.ts

import type { NodeJSON } from 'prosekit/core'

export const defaultContent: NodeJSON = {
  type: 'doc',
  content: [
    {
      type: 'paragraph',
      content: [
        {
          type: 'text',
          text: 'Drag the images below to see the custom drop cursor.',
        },
      ],
    },
    {
      type: 'image',
      attrs: {
        src: 'https://placehold.co/120x60/f59e0b/FFF?text=Amber',
      },
    },
    {
      type: 'image',
      attrs: {
        src: 'https://placehold.co/120x60/84cc16/FFF?text=Lime',
      },
    },
    {
      type: 'image',
      attrs: {
        src: 'https://placehold.co/120x60/06b6d4/FFF?text=Cyan',
      },
    },
    {
      type: 'image',
      attrs: {
        src: 'https://placehold.co/120x60/f43f5e/FFF?text=Rose',
      },
    },
  ],
}