@tiptap/pm 3.11.0: undo

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify @tiptap/pm.undo in pkg:npm/%40tiptap/pm@3.11.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40tiptap/pm@3.11.0
Demonstrate these symbols/APIs:
  - @tiptap/pm.undo

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:d84cc8bb3ab4e70803024d815d6220996c735bcf6dd8eed44f66d3e1d3b1d7be","contract":["undo is a ProseMirror command function that operates on EditorState and dispatch","undo returns false when there is no undoable history in the EditorState","undo returns false when EditorState has no history plugin configured","undo returns true and does not mutate state when dispatch callback is omitted","undo reverts document changes made by transactions when history plugin is active and dispatch is provided","undo restores editor selection to the state prior to the undone transaction","undoDepth correctly tracks the number of undoable history events","redo reapplies changes that were previously reverted by undo","closeHistory separates consecutive transactions into distinct undoable steps"],"goal":"verify @tiptap/pm.undo in pkg:npm/%40tiptap/pm@3.11.0","kind":"HOW","packages":["pkg:npm/%40tiptap/pm@3.11.0"],"schemaVersion":1,"symbols":["@tiptap/pm.undo"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40tiptap/pm@3.11.0"],"schemaVersion":1,"subject":"pkg:npm/%40tiptap/pm@3.11.0","symbols":["@tiptap/pm.undo"],"verifierAdapter":"node-typescript@1"}

import { undo, redo, history, undoDepth, redoDepth, closeHistory } from '@tiptap/pm/history';
import { EditorState } from '@tiptap/pm/state';
import { schema } from '@tiptap/pm/schema-basic';

export { undo, redo, history, undoDepth, redoDepth, closeHistory, EditorState, schema };
export default undo;

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      "integrity": "sha512-ARDJmphmdvUk6Glw7y9DQ2bFkKBHwQHLi2lsaH6PPmz/Ka9sFOBsBluozhDltWmnv9u/cF6Rt87znRTPV+yp/A==",
      "license": "MIT"
    },
    "node_modules/w3c-keyname": {
      "version": "2.2.8",
      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
      "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-tiptap-pm-undo",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "@tiptap/pm": "3.11.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @tiptap/pm.undo in pkg:npm/%40tiptap/pm@3.11.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40tiptap/pm@3.11.0"
  ],
  "symbols": [
    "@tiptap/pm.undo"
  ]
}

import assert from 'node:assert/strict';
import { undo, redo, history, undoDepth, redoDepth, closeHistory, EditorState, schema } from '../index.mjs';

// 1. undo is a ProseMirror command function that operates on EditorState and dispatch
{
  assert.equal(typeof undo, 'function');
  assert.equal(undo.length, 2);
}

// 2. undo returns false when there is no undoable history in the EditorState
{
  const state = EditorState.create({ schema, plugins: [history()] });
  let dispatched = false;
  const result = undo(state, () => { dispatched = true; });
  assert.equal(result, false);
  assert.equal(dispatched, false);
}

// 3. undo returns false when EditorState has no history plugin configured
{
  const stateNoPlugin = EditorState.create({ schema });
  const tr = stateNoPlugin.tr.insertText('text without history');
  const appliedState = stateNoPlugin.apply(tr);
  assert.equal(appliedState.doc.textContent, 'text without history');
  let dispatched = false;
  const result = undo(appliedState, () => { dispatched = true; });
  assert.equal(result, false);
  assert.equal(dispatched, false);
}

// 4. undo returns true and does not mutate state when dispatch callback is omitted
{
  const state = EditorState.create({ schema, plugins: [history()] });
  const tr = state.tr.insertText('preview undo');
  const applied = state.apply(tr);
  assert.equal(applied.doc.textContent, 'preview undo');
  const canUndo = undo(applied);
  assert.equal(canUndo, true);
  assert.equal(applied.doc.textContent, 'preview undo');
}

// 5. undo reverts document changes made by transactions when history plugin is active and dispatch is provided
{
  const state = EditorState.create({ schema, plugins: [history()] });
  const tr = state.tr.insertText('Initial content');
  const state1 = state.apply(tr);
  assert.equal(state1.doc.textContent, 'Initial content');

  let undoTr = null;
  const success = undo(state1, (action) => { undoTr = action; });
  assert.equal(success, true);
  assert.ok(undoTr);

  const undoneState = state1.apply(undoTr);
  assert.equal(undoneState.doc.textContent, '');
}

// 6. undo restores editor selection to the state prior to the undone transaction
{
  const state = EditorState.create({ schema, plugins: [history()] });
  const tr1 = state.tr.insertText('First block of text');
  const state1 = state.apply(tr1);
  const initialSelFrom = state1.selection.from;

  const tr2 = closeHistory(state1.tr).insertText(' - second addition');
  const state2 = state1.apply(tr2);
  assert.notEqual(state2.selection.from, initialSelFrom);

  let undoTr = null;
  undo(state2, (action) => { undoTr = action; });
  const restoredState = state2.apply(undoTr);
  assert.equal(restoredState.doc.textContent, 'First block of text');
  assert.equal(restoredState.selection.from, initialSelFrom);
}

// 7. undoDepth correctly tracks the number of undoable history events
{
  const state = EditorState.create({ schema, plugins: [history()] });
  assert.equal(undoDepth(state), 0);

  const tr1 = state.tr.insertText('Step 1');
  const state1 = state.apply(tr1);
  assert.equal(undoDepth(state1), 1);

  const tr2 = closeHistory(state1.tr).insertText(' Step 2');
  const state2 = state1.apply(tr2);
  assert.equal(undoDepth(state2), 2);

  let undoTr = null;
  undo(state2, (action) => { undoTr = action; });
  const stateAfterUndo = state2.apply(undoTr);
  assert.equal(undoDepth(stateAfterUndo), 1);
}

// 8. redo reapplies changes that were previously reverted by undo
{
  const state = EditorState.create({ schema, plugins: [history()] });
  const tr = state.tr.insertText('Reversible change');
  const state1 = state.apply(tr);

  let undoTr = null;
  undo(state1, (action) => { undoTr = action; });
  const stateUndone = state1.apply(undoTr);
  assert.equal(stateUndone.doc.textContent, '');
  assert.equal(redoDepth(stateUndone), 1);

  let redoTr = null;
  const canRedo = redo(stateUndone, (action) => { redoTr = action; });
  assert.equal(canRedo, true);
  assert.ok(redoTr);

  const stateRedone = stateUndone.apply(redoTr);
  assert.equal(stateRedone.doc.textContent, 'Reversible change');
  assert.equal(redoDepth(stateRedone), 0);
}

// 9. closeHistory separates consecutive transactions into distinct undoable steps
{
  const state = EditorState.create({ schema, plugins: [history()] });
  const tr1 = state.tr.insertText('Part A');
  const s1 = state.apply(tr1);

  const tr2 = closeHistory(s1.tr).insertText(' Part B');
  const s2 = s1.apply(tr2);
  assert.equal(undoDepth(s2), 2);

  let trU1 = null;
  undo(s2, (a) => { trU1 = a; });
  const s3 = s2.apply(trU1);
  assert.equal(s3.doc.textContent, 'Part A');

  let trU2 = null;
  undo(s3, (a) => { trU2 = a; });
  const s4 = s3.apply(trU2);
  assert.equal(s4.doc.textContent, '');
}

console.log('All contract assertions passed.');