Yjs Collaboration Editor-Test Harvest Plan

Sync note, 2026-05-18: current package planning lives in docs/plans/2026-05-18-slate-yjs-package-readiness-ralplan.md. This harvest remains the evidence inventory, not the current slate-yjs API decision.

Sync note, 2026-05-24: keep using the stable harvest artifacts as the test corpus, but do not infer current API or package existence from this file. Current source truth is in the 2026-05-18 package-readiness ralplan refresh: packages/slate-yjs still lacks source, and the required execution work is package scaffold, full simulation example, package tests, and Playwright selection coverage.

Sync note, 2026-05-28: this remains the harvested evidence corpus only. Live ../slate-v2 now has @slate/yjs package source. Current architecture and operation-matrix work lives in docs/plans/2026-05-28-slate-yjs-current-architecture-operation-matrix.md.

status: done owner_skill: .agents/skills/editor-test-harvester/SKILL.md report: docs/editor-test-harvester/yjs-collaboration/report.md completion: active goal state

Goal

Run a license-gated harvest of Yjs collaboration tests from ../slate-yjs, ../lexical/packages/lexical-yjs, ../y-prosemirror, and ../yjs; classify portable behavior, map it to Slate v2 and Plate owners, and leave report-only artifacts.

Phases

Skill analysis and goal setup
Resolve target repos and license modes
Build exhaustive test inventories
Extract fixture/test names
Classify every row
Map behavior to Slate v2 and Plate owners
Write report, inventory, test-index, and completion state
Verify report sections and completion check

Key Findings

All four targets are MIT/permissive from local license evidence.
../lexical/packages/lexical-yjs has no runnable test files under the harvester inventory pattern.
Slate v2 already has strong raw collaboration substrate coverage in .tmp/slate-v2/packages/slate/test/collab-history-runtime-contract.ts.
Plate already has useful Yjs slow fixtures, but it can still profit from a compact adapter-conversion pack for unicode, marks, nested moves, split/merge/set-node, and cursor projection.

Verification

rg -n "License Gate|Confidence Score|Pass-State Ledger|Matrix|Skips|Next Slice|Full Inventory Appendix" docs/editor-test-harvester/yjs-collaboration/report.md
test -f docs/editor-test-harvester/yjs-collaboration/inventory.md
test -f docs/editor-test-harvester/yjs-collaboration/test-index.md
bun run completion-check -- --id 019e1c53-3e25-78c0-9083-355925be3817