@tiptap/core/src/commands/joinTextblockBackward.ts

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import { joinTextblockBackward as originalCommand } from '@tiptap/pm/commands'

import { RawCommands } from '../types.js'

declare module '@tiptap/core' {
  interface Commands<ReturnType> {
    joinTextblockBackward: {
      /**
       * A more limited form of joinBackward that only tries to join the current textblock to the one before it, if the cursor is at the start of a textblock.
       */
      joinTextblockBackward: () => ReturnType
    }
  }
}

export const joinTextblockBackward: RawCommands['joinTextblockBackward'] = () => ({ state, dispatch }) => {
  return originalCommand(state, dispatch)
}