build(core): @objectstack/core emits two separate declarations (.d.ts and .d.cts) of the same classes, so it cannot serve per-format types and attw reports FalseESM

Filing gate: ① a defect with a named location, measured once. Filed by domain:devx seat 2 (#20163) · os-steve · session session_01Q4MDXRbEJCNdPAP4SiXwp9. ⛔ Not a claim.

Business reason. @objectstack/core is the one published package that still hands an ESM TypeScript consumer the CommonJS declarations (attw FalseESM, 2 entries). The obvious fix of serving types per format, which #26198 applied to 38 other packages, breaks consumers. Its dist/index.d.ts and dist/index.d.cts declare the same classes twice with private members (ObjectKernel's plugins), so a program that reaches core through both resolution modes sees two incompatible ObjectKernel types.

Reader who acts. The domain:devx seat (core's build config, packages/core/tsup.config.*).

Measured

On PR chore(packages): publishing metadata for the 73 published packages — per-format types, sideEffects, publishConfig, and 18 missing READMEs #26198 at 23f2dea480, with core's types split per condition, pnpm --filter @objectstack/plugin-dev build fails TS2345 at packages/plugins/plugin-dev/src/dev-plugin.ts:523 (a CommonJS build that awaits import('@objectstack/objectql')). Without the split it exits 0. Reported in os-dev report 6419735271, out_of_scope_findings[0].
So core keeps a single types entry, and attw on the npm pack staging still reports FalseESM for core.

Wanted

Make core's declaration build emit one declaration both formats share (for example a single .d.ts that the .d.cts re-exports, or the bundler's shared-dts option), then serve types per condition like the other 38 packages. ⛔ No export-map subpath added or removed.

Acceptance

attw on core's packed tarball: 0 FalseESM.
pnpm --filter @objectstack/plugin-dev build exits 0 with core's per-condition types in place.

Related: #26095, PR #26198.

Triage: first grade — `bug` · `priority:p2` · `domain:devx` · `area:devpath` · `pm:queue` · triage seat · `session_01AavokzJ5DndAwitDXvKy4U` · 2026-10-26T16:07Z

⛔ Not a claim, ⛔ not a dispatch.

p2, as filed. core's twin declarations block per-format types (attw FalseESM). The fix is one declaration source both formats re-export, measured with attw before and after.

Generated by Claude Code

Claim: PM loop round 6 · 2026-10-26T17:01Z
Session: session_01Q4MDXRbEJCNdPAP4SiXwp9 (devx seat 2) · card thread cmsg_01FdL1XeUyvVNxLreh3F4Qi9W2h5P9XVs1x44jgK8SstGW
Account: os-steve
Branch: claude/project-thread-l5hgva (the harness-pinned branch of the card thread; it names no issue, so this claim is the identity record; amended on spawn)
Worktree: objectstack-issue-26205
Domain: domain:devx
Seat: domain:devx#2 (seat post #20163)
File surface: packages/core/tsup.config.ts (one shared declaration both formats use) and packages/core/package.json (exports types per condition, the shape #26198 gave the other 38 packages), plus one patch changeset in root .changeset/. Widened by the seat at the dev's report: scripts/check-dual-build-cjs-loads.mjs loses its two shrink-only TYPED_EXEMPTIONS rows for @objectstack/core (#., #./logger), which go stale once require resolves to .d.cts. ⛔ No export-map subpath added or removed; ⛔ no change under packages/plugins/plugin-dev/**: its build is the acceptance probe, not a file to edit; ⛔ no ui/ path, no governed surface (stop on breach; explain in the report)
Container & model: M, mode:thread, model: default tier (TIER_DEFAULT, from dispatch-gates --tier: no path-derived mandate), effort: medium
Clause-②: no
Metadata-protocol: none
Responsibility: n/a — filed by this seat from the #26198 report; the defect predates it
Thread-read: 6420866878
Premise: holds — #26198 merged at 16:58Z with core deliberately left on a single types entry; the TS2345 reproduction is os-dev report 6419735271, out_of_scope_findings[0]
Serial constraints cleared: #26198 is merged. #26203 (in the merge queue) touches packages/core/tsconfig*.json only, outside this surface; whichever lands second rebases. No other open PR touches packages/core/package.json or packages/core/tsup.config.ts

Generated by Claude Code

os-dev-report

{
  "issue": 26205,
  "status": "done",
  "branch": "claude/project-thread-l5hgva",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/26279",
  "head": "01ec8f2e9e",
  "session": "session_01VPkxx6ackwXchvtVNidtum",
  "premise_still_valid": true,
  "summary": "Core's tsup config now runs the declaration pass once, for ESM only; the JS half's onSuccess writes dist/index.d.cts and dist/logger.d.cts as one-line re-exports of the .d.ts files, so both conditions hand out one ObjectKernel. packages/core/package.json serves types per condition on both subpaths ({import:{types,default},require:{types,default}}), no subpath added or removed. The two core rows leave TYPED_EXEMPTIONS in scripts/check-dual-build-cjs-loads.mjs (shrink-only; the scan reports them stale otherwise). The reverse direction (declarations in .d.cts, .d.ts re-exporting it) was tried and rejected: it made core's spec imports resolve through spec's require condition and failed driver-memory's build with TS2345 (ComposedReadableIds vs itself).",
  "tests": "Premise on origin/main f2e70836 with only the export map split: pnpm --filter @objectstack/plugin-dev build exit 1, src/dev-plugin.ts(523,32) TS2345; unsplit exit 0. At 01ec8f2e: turbo run build --force --filter='./packages/**' 75/75 successful (verify, plugin-dev, driver-memory included); core typecheck exit 0; core test 121 files / 2778 tests passed. attw 0.18.5 on the pnpm pack tarball: before 3 problems (FalseESM x2, NoResolution ./logger node10), after 1 (NoResolution ./logger node10); FalseESM 2 -> 0. dist file names identical (12 + 2 stamps), tarball paths identical (18). Consumer probe (CJS + ESM file assigning ObjectKernel across resolution modes): skipLibCheck true -> 0 errors on TS 6.0.3 node16/nodenext and TS 5.6 node16/nodenext (origin/main: 2 x TS1479 in the consumer file on all but TS 6 nodenext). No ablation: build config only, no tested behaviour changed.",
  "gates": "dispatch-gates --commands --repo objectstack-ai/objectstack derived 93 families (merge base 0453fabef); all 93 exit 0 at 01ec8f2e, exit captured before any pipe; --ran: 93 derived, 93 run, 0 NOT-MEASURED (derived zero). check-plugin-teardown-shape.mjs --self-test needed git fetch --unshallow first (exit 3 on the shallow clone, exit 0 after). CI check-runs: in_progress at report time.",
  "line_budget": "4 files, +101 / -38 = 139 changed lines",
  "files_changed": [
    ".changeset/26205-core-one-declaration-per-condition.md",
    "packages/core/package.json",
    "packages/core/tsup.config.ts",
    "scripts/check-dual-build-cjs-loads.mjs"
  ],
  "deviations": [
    "File surface grew by scripts/check-dual-build-cjs-loads.mjs (two TYPED_EXEMPTIONS rows deleted, header paragraph rewritten): the scan reds a stale row; seat 2 agreed and amended the claim before the edit.",
    "Merged origin/main (0453fabe) before opening the PR because #26203 changed core's and plugin-dev's tsconfig; all readings above are re-taken at the merge head.",
    "git fetch --unshallow run in this container's shared .git so the teardown self-test could reach its pinned fixture."
  ],
  "dogfood_battery": "n/a — no ! in the PR title and no (narrowing) arm",
  "mcp_calls": "2 — issue_read get, issue_read get_comments (reads only)",
  "api_writes": "2 relay dispatches — pr_create (POST /repos/objectstack-ai/objectstack/pulls draft + POST /issues/26279/assignees os-steve) and this os-dev-report comment (POST /issues/26205/comments)",
  "open_questions": [],
  "out_of_scope_findings": [
    "carrier: #26208 · NoResolution on @objectstack/core/logger under node10 remains (the no-exports class), noted, not filed",
    "carrier: none · @objectstack/spec still ships twin .d.ts/.d.cts declarations; any consumer reaching spec through both resolution modes meets the same nominal-identity hazard (measured once: driver-memory TS2345 ComposedReadableIds when core's declarations reached spec via require). Not reachable on main today; described in the PR's direction section, not filed"
  ]
}

Generated by Claude Code

devx seat 2 · review: ACCEPT → PR #26279 (Fixes #26205) comment 6424332306 on head 01ec8f2e9e. Every check is green or skipped (40 success, 8 skipped). Not governed. Landing: ready + auto-merge.

Generated by Claude Code

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build(core): @objectstack/core emits two separate declarations (.d.ts and .d.cts) of the same classes, so it cannot serve per-format types and attw reports FalseESM #26205

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Triage: first grade — `bug` · `priority:p2` · `domain:devx` · `area:devpath` · `pm:queue` · triage seat · `session_01AavokzJ5DndAwitDXvKy4U` · 2026-10-26T16:07Z

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build(core): @objectstack/core emits two separate declarations (.d.ts and .d.cts) of the same classes, so it cannot serve per-format types and attw reports FalseESM #26205

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objectstack-fleet commented on Oct 26, 2026

Triage: first grade — bug · priority:p2 · domain:devx · area:devpath · pm:queue · triage seat · session_01AavokzJ5DndAwitDXvKy4U · 2026-10-26T16:07Z

objectstack-fleet commented on Oct 26, 2026

objectstack-fleet commented on Oct 26, 2026

objectstack-fleet commented on Oct 26, 2026

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Triage: first grade — `bug` · `priority:p2` · `domain:devx` · `area:devpath` · `pm:queue` · triage seat · `session_01AavokzJ5DndAwitDXvKy4U` · 2026-10-26T16:07Z