prosemirror-recreate-steps

This is a non-core module of ProseMirror. ProseMirror is a well-behaved rich semantic content editor based on contentEditable, with support for collaborative editing and custom document schemas.

Every change to the document is recorded by ProseMirror as a step. This module allows recreating the steps needed to go from document A to B should these not be available otherwise, and it allows merging two different Transforms (sets of steps) whose steps may be conflicting.

Recreating steps can be interesting for example in order to show the changes between two document versions without having access to the original steps. Merging Transforms can be of iinterest should two users have worked on the same document over time without any means for synchronizing their work.

Recreating a Transform works this way:

import {recreateTransform} from "prosemirror-recreate-steps"

let tr = recreateTransform(
    startDoc, 
    endDoc, 
    complexSteps = true, // Whether step types other than ReplaceStep are allowed.
    wordDiffs = false // Whether diffs in text nodes should cover entire words.
)

Merging Transforms works this way:

import {mergeTransform} from "prosemirror-recreate-steps"

let {
    tr, 
    merge
} = mergeTransform(
    tr1, 
    tr2, 
    automerge = true, // Whether to try to auto-merge conflicting changes 
    rebase = false, // Whether to rebase the changes in tr2 on top of those in tr1.
    wordDiffs = false // Whether diffs in text nodes should cover entire words.
)

The tr is a Tranform of all combined changes of tr1 and tr2 that are not conflicting if automerge is enabled (otherwise it's a Transform with 0 steps).

The merge is a Merge object that contains information about all conflicting steps and how they conflict with oneanother. Look at the examples in the demo folder on how to make use of it.