Directly export updateOriginalDoc

FEATURE: The state effect used to change the original document in a unified merge view is
now available to client code as `updateOriginalDoc`.

See https://discuss.codemirror.net/t/using-merge-w-collab/7648

Author: marijnh

README.md

@@ -206,11 +206,17 @@ to the content it has in the original document.</p>
 <dd><p>Get the original document from a unified merge editor's state.</p>
 </dd>
 <dt id="user-content-originaldocchangeeffect">
-  <code><strong><a href="#user-content-originaldocchangeeffect">originalDocChangeEffect</a></strong>(<a id="user-content-originaldocchangeeffect^state" href="#user-content-originaldocchangeeffect^state">state</a>: <a href="https://codemirror.net/docs/ref#state.EditorState">EditorState</a>, <a id="user-content-originaldocchangeeffect^changes" href="#user-content-originaldocchangeeffect^changes">changes</a>: <a href="https://codemirror.net/docs/ref#state.ChangeSet">ChangeSet</a>) → <a href="https://codemirror.net/docs/ref#state.StateEffect">StateEffect</a>&lt;any&gt;</code></dt>
+  <code><strong><a href="#user-content-originaldocchangeeffect">originalDocChangeEffect</a></strong>(<a id="user-content-originaldocchangeeffect^state" href="#user-content-originaldocchangeeffect^state">state</a>: <a href="https://codemirror.net/docs/ref#state.EditorState">EditorState</a>, <a id="user-content-originaldocchangeeffect^changes" href="#user-content-originaldocchangeeffect^changes">changes</a>: <a href="https://codemirror.net/docs/ref#state.ChangeSet">ChangeSet</a>) → <a href="https://codemirror.net/docs/ref#state.StateEffect">StateEffect</a>&lt;{doc: <a href="https://codemirror.net/docs/ref#state.Text">Text</a>, changes: <a href="https://codemirror.net/docs/ref#state.ChangeSet">ChangeSet</a>}&gt;</code></dt>
 
 <dd><p>Create an effect that, when added to a transaction on a unified
 merge view, will update the original document that's being compared against.</p>
 </dd>
+<dt id="user-content-updateoriginaldoc">
+  <code><strong><a href="#user-content-updateoriginaldoc">updateOriginalDoc</a></strong>: <a href="https://codemirror.net/docs/ref#state.StateEffectType">StateEffectType</a>&lt;{doc: <a href="https://codemirror.net/docs/ref#state.Text">Text</a>, changes: <a href="https://codemirror.net/docs/ref#state.ChangeSet">ChangeSet</a>}&gt;</code></dt>
+
+<dd><p>The state effect used to signal changes in the original doc in a
+unified merge view.</p>
+</dd>
 </dl>
 <h3>Chunks</h3>
 <dl>

src/README.md

@@ -41,6 +41,8 @@ to communication around the project.
 
 @originalDocChangeEffect
 
+@updateOriginalDoc
+
 ### Chunks
 
 @Chunk

src/index.ts

@@ -4,6 +4,7 @@ export {getChunks, goToNextChunk, goToPreviousChunk} from "./merge"
 
 export {MergeConfig, DirectMergeConfig, MergeView} from "./mergeview"
 
-export {unifiedMergeView, acceptChunk, rejectChunk, getOriginalDoc, originalDocChangeEffect} from "./unified"
+export {unifiedMergeView, acceptChunk, rejectChunk, getOriginalDoc,
+        originalDocChangeEffect, updateOriginalDoc} from "./unified"
 
 export {Chunk} from "./chunk"

src/unified.ts

@@ -72,11 +72,13 @@ export function unifiedMergeView(config: UnifiedMergeConfig) {
   ]
 }
 
-const updateOriginalDoc = StateEffect.define<{doc: Text, changes: ChangeSet}>()
+/// The state effect used to signal changes in the original doc in a
+/// unified merge view.
+export const updateOriginalDoc = StateEffect.define<{doc: Text, changes: ChangeSet}>()
 
 /// Create an effect that, when added to a transaction on a unified
 /// merge view, will update the original document that's being compared against.
-export function originalDocChangeEffect(state: EditorState, changes: ChangeSet): StateEffect<any> {
+export function originalDocChangeEffect(state: EditorState, changes: ChangeSet): StateEffect<{doc: Text, changes: ChangeSet}> {
   return updateOriginalDoc.of({doc: changes.apply(state.doc), changes})
 }