CommandExecuted event and reacts only to mutations of this workbook: type is MUTATION, the mutation is not onlyLocal (formula calculation), and params.unitId is the workbook’s id. The cell editor is a separate internal Univer document that mutates on every keystroke; without the unit check the post was marked dirty as soon as it opened.setAttributes( { workbook } ). WordPress’s own Save, autosave and revisions take it from there.The block editor’s real-time collaboration syncs the whole workbook as one attribute, so two people editing different cells at the same moment overwrite each other: the last change wins for the whole workbook. Presence, title, status and terms sync normally. Cell-level co-editing needs Univer’s mutations mapped onto the editor’s Yjs document (planned).
Namespace lh/v1, base spreadsheets (filters lh_spreadsheets_rest_return_namespace, lh_spreadsheets_rest_return_rest_base). GET lists up to 50 (own only without edit_others_posts), POST creates, and GET, PUT and DELETE on /{id} read, patch and delete. Writes take title, description, status and workbook (an object); the API wraps the workbook in the block itself. Publishing without publish_posts is demoted to pending. Core’s wp/v2/spreadsheets route also exists, returning the raw block markup.
Source is in src/; build/ is generated with npm install then npm run build and deployed as is (nothing is built on the server). webpack.config.js runs two builds: the block with WordPress packages as externals, and the Univer host with everything bundled. Univer is pinned to an exact version in package.json; upgrade it deliberately and retest, since its API has moved between releases.