objectstack-ai
diff --git a/‎.changeset/rest-production-exceljs-typing.md‎
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diff --git a/‎content/docs/permissions/system-context.mdx‎
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diff --git a/‎packages/rest/src/import-prepare.ts‎
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diff --git a/‎packages/rest/src/package-door-declared-code.test.ts‎
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diff --git a/‎packages/rest/src/rest-server.ts‎
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diff --git a/‎packages/rest/src/xlsx-module.test.ts‎
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@@ -0,0 +1,32 @@
+---
+"@objectstack/rest": patch
+---
+
+fix(rest): type the two production exceljs dynamic imports behind one named accessor
+
+Both places `@objectstack/rest` production source reached exceljs bound the
+module as `const ExcelJS: any`, so `parseXlsxToRows` (the whole .xlsx import
+path) and `createXlsxStream` (the streaming .xlsx export path) built workbooks,
+read worksheets, iterated rows and read cells through a value tsc knew nothing
+about. A misspelled method, a wrong argument arity or a property exceljs
+renamed was not a compile error — it surfaced, if at all, as a runtime fault in
+a deployed import or export.
+
+`src/xlsx-module.ts` is now the single binding site both paths share, and it
+keeps the load lazy: everything in it is either a type (erased at emit) or
+inside the async accessor, so a CSV or JSON import still never pays to load
+exceljs.
+
+**Typing-only — no runtime behaviour change, and no change to the published API
+surface.** `parseXlsxToRows` keeps its exact signature
+(`(buffer: Buffer | ArrayBuffer, mapping?, sheet?)`), the package's exports are
+unchanged, and the accessor is internal. The interop expression is the one the
+call sites already ran (awaited once rather than twice — the second
+`await import('exceljs')` resolved from the module cache to the identical
+record), and the non-array shape of `Row.values` iterates zero times before and
+after. `@objectstack/rest`'s 160 test files / 2698 tests pass unchanged.
+
+This is a `patch` rather than a `skip-changeset` because it was measured to
+reach the published artifact: `loadExcelJs` greps 3 in `dist/index.js` and 3 in
+`dist/index.cjs` (`asXlsxLoadInput` 2 and 2), against a positive control of
+`RestServer` = 36.
@@ -64,7 +64,7 @@ not on any flag.
 ## How the flag is set
 
 `isSystem` is **server-constructed and never client-supplied**. Inbound HTTP
-cannot set it (`packages/rest/src/rest-server.ts:1234`, `:1263`), and neither
+cannot set it (`packages/rest/src/rest-server.ts:1235`, `:1264`), and neither
 can an action body (`packages/runtime/src/domains/actions.ts:404`). It is
 written by internal callers only, as an option on the engine call:
 
@@ -103,7 +103,7 @@ that silently does not happen.
 | 14 | MCP stdio bridge skips the object API-exposure gate | mcp | Get: the bridge reaches objects whose `apiEnabled` / `apiMethods` would refuse an external caller | `stdio-data-bridge.ts:246` |
 | 15 | **Read-audit rows are not written** | plugin-audit | Lose: the "a person opened this record" trail. `sudo()` keeps the caller's `userId`, so this flag is the only thing separating a human read from a platform one | `read-audit.ts:556` |
 | 16 | Approval snapshot payload redaction skipped | plugin-approvals | Get: the whole snapshot on `find` / `findOne` — the audit/replay channel. Lose: field-visibility redaction over approval payloads | `payload-redaction-middleware.ts:115` |
-| 17 | REST anonymous-deny seam satisfied | rest | Get: `enforceAuth` passes with no `userId`. Not reachable from the wire — `isSystem` is never set on an inbound request | `rest-server.ts:1266` |
+| 17 | REST anonymous-deny seam satisfied | rest | Get: `enforceAuth` passes with no `userId`. Not reachable from the wire — `isSystem` is never set on an inbound request | `rest-server.ts:1267` |
 
 ### 2. Write pipeline and data integrity
 
@@ -158,7 +158,7 @@ The largest single consumer — **20 of the 109 sites**.
 |:--|:---|:---|:---|:---|
 | 48 | Object API-exposure gate bypassed (`apiEnabled` / `apiMethods`) | runtime | Get: internal self-writes ignore exposure declarations — these govern **external** exposure, not engine self-writes | `action-execution.ts:136` |
 | 49 | Action `requiredPermissions` bypassed | runtime | Get: engine self-invocation runs any action | `action-execution.ts:399` |
-| 50 | `manage_metadata` bypassed on metadata writes | runtime, rest | Get: schema writes without the capability | `domains/meta.ts:471`, `:874`, `rest-server.ts:4270`, `:5633`, `:5865`, `:6210`, `:6403` |
+| 50 | `manage_metadata` bypassed on metadata writes | runtime, rest | Get: schema writes without the capability | `domains/meta.ts:471`, `:874`, `rest-server.ts:4271`, `:5634`, `:5866`, `:6211`, `:6404` |
 | 51 | The shared metadata-write verdict itself returns `allowed` | metadata-core | Get: the one function all of row 50's doors consult answers yes before any capability is examined | `meta-write-capability.ts:134` |
 | 52 | Anonymous-deny seam satisfied on the domain dispatchers and the package/federation routes | runtime, rest | Get: passes with no `userId` | `domains/actions.ts:411`, `domains/ai.ts:60`, `domains/automation.ts:982`, `domains/meta.ts:232`, `domains/security.ts:78`, `domains/packages.ts:246`, `external-datasource-routes.ts:302`, `package-routes.ts:92` |
 | 53 | MCP principal check satisfied | runtime | Get: MCP surface reachable with no user | `domains/mcp.ts:61` |
@@ -199,7 +199,7 @@ assuming `isSystem` covers it is a documented source of bugs.
 | "It preserves a supplied `updated_at` / `updated_by`" | **No.** That is `preserveAudit`, a separate opt-in — and an UPDATE-path exemption only | `field.zod.ts:1451` (#3493 / #6640) |
 | "It stamps `created_by`" | **No.** Audit stamping reads `userId` from the context. A user-less system write stamps nothing — that is today's behaviour, not an error | `runtime-identity.ts:280`–`281` |
 | "It bypasses every guard" | **No.** The last-admin guard applies to **every** context, `isSystem` included — the deprovision path that actually locks an org out is the system one | `last-admin-guard.ts:273` |
-| "A client can request it" | **No.** Never settable from inbound HTTP or from an action body | `rest-server.ts:1234`, `:1263`; `domains/actions.ts:404` |
+| "A client can request it" | **No.** Never settable from inbound HTTP or from an action body | `rest-server.ts:1235`, `:1264`; `domains/actions.ts:404` |
 
 ---
 
 
@@ -13,6 +13,7 @@ import {
     type ExportFieldMeta,
 } from './export-format.js';
 import { resolveNamedMapping, applyMappingToRows, type MappingArtifactLike } from './import-mapping.js';
+import { asXlsxLoadInput, loadExcelJs } from './xlsx-module.js';
 
 /**
  * Minimal RFC-4180-style CSV parser used by the bulk-import endpoint
@@ -138,15 +139,23 @@ export async function parseXlsxToRows(
     mapping: Record<string, string> = {},
     sheet?: string | number,
 ): Promise<Array<Record<string, any>>> {
-    const ExcelJS: any = (await import('exceljs')).default ?? (await import('exceljs'));
+    const ExcelJS = await loadExcelJs();
     const wb = new ExcelJS.Workbook();
-    await wb.xlsx.load(buffer);
-    const ws = sheet !== undefined ? wb.getWorksheet(sheet as any) : wb.worksheets[0];
+    // The assertion is on the Node `Buffer` arm ONLY. `ArrayBuffer` is already
+    // assignable to the module-local shim exceljs declares for this parameter,
+    // so that arm reaches `load` unasserted and stays checked; asserting the
+    // whole union would switch that check off. See `xlsx-module.ts`.
+    await wb.xlsx.load(buffer instanceof ArrayBuffer ? buffer : asXlsxLoadInput(buffer));
+    const ws = sheet !== undefined ? wb.getWorksheet(sheet) : wb.worksheets[0];
     if (!ws) return [];
 
     const cells: string[][] = [];
-    ws.eachRow({ includeEmpty: false }, (row: any) => {
-        const values = row.values as any[]; // 1-based; index 0 is unused
+    ws.eachRow({ includeEmpty: false }, (row) => {
+        // exceljs declares `Row.values` as the 1-based array form (index 0
+        // unused) OR a keyed object; a workbook parsed from bytes yields the
+        // array. The keyed shape iterates zero times either way — its `.length`
+        // was `undefined` before, so the loop below never ran for it.
+        const values = Array.isArray(row.values) ? row.values : [];
         const line: string[] = [];
         for (let c = 1; c < values.length; c++) line.push(xlsxCellToString(values[c]));
         cells.push(line);
 
@@ -100,6 +100,38 @@
  * itself and the handler's `try` catches it) — and the production wrapper
  * above has no statement that can make one.
  *
+ * ⭐ WHICH `.catch` is load-bearing: NEITHER of the two named above. A
+ * production fault never arrives at either one AS A REJECTION.
+ * `computeExecCtx` — the private body behind `resolveExecCtx` — wraps its
+ * WHOLE body in `try { … } catch { return undefined; }`, so a faulting
+ * resolve FULFILS with `undefined` rather than rejecting, and the
+ * fault-to-anonymous conversion has already happened one level BELOW by the
+ * time either `.catch(() => undefined)` is reached. ⇒ removing either of them
+ * would not by itself surface a production fault: a reader who deletes one
+ * expecting a 5xx to appear measures no change and concludes the wrong thing
+ * about where the conversion lives. That is the whole reason this paragraph
+ * exists.
+ *
+ * ⚠️ And that first net is NOT per-door, unlike the two above it.
+ * `resolveExecCtx(environmentId, req).catch(() => undefined)` is written
+ * per-consumer — 16 times in `rest-server.ts` as this file is written — while
+ * `computeExecCtx`'s catch is ONE site whose conversion every one of those
+ * consumers inherits. So what this door reads is not a property OF this door,
+ * and a census of the other consumers is a separate file rather than a
+ * section here.
+ *
+ * ⛔ Both facts are MEASURED ELSEWHERE and cited here rather than restated —
+ * a second copy is a second thing to drift, and this file's own convention is
+ * to state a reason once and point at it:
+ *   - `package-door-execctx-fault-reading.test.ts` — that the production
+ *     supplier really does fulfil rather than reject, read per class.
+ *   - `package-door-execctx-fault-reachability.test.ts` — that no degraded
+ *     class reaches the wrapper as a rejection, against a control showing the
+ *     witness CAN report one.
+ *   - `execctx-consumer-census.test.ts` — the per-site census over every
+ *     `resolveExecCtx` consumer, each row DRIVEN rather than read off the
+ *     shape.
+ *
  * ⚠️ Nor can an embedder reach it: `registerPackageRoutes` and
  * `PackageRoutesOptions` are NOT exported from `packages/rest/src/index.ts`
  * (the package publishes a single `.` entry, and `direct-mount-composition.ts`
@@ -116,8 +148,11 @@
  * ⛔ Whether that double swallow SHOULD exist at all is a different
  * question — it would change what a public door emits — and it is open
  * at #12537, deliberately not answered here. Note for whoever takes it: the
- * swallow is documented at NEITHER site, so "deliberate" is not established by
- * the code as it stands.
+ * swallow is now documented at ONE of the two sites, not neither —
+ * `rest-server.ts`'s `resolvePackageRouteExecutionContext` carries the
+ * reading, the second-net correction above included — while the
+ * `package-routes.ts` site still carries none. So "deliberate" is established
+ * by the code for the first site and still is not for the second.
  *
  * Section 5 is the second fact stated as a test: a REAL `ObjectQL`, a REAL
  * `ObjectStackProtocolImplementation` and a failing driver, driven through the
 
@@ -194,6 +194,7 @@ import {
 } from './export-format.js';
 import { runImport } from './import-runner.js';
 import { prepareImportRequest } from './import-prepare.js';
+import { loadExcelJs, type Worksheet } from './xlsx-module.js';
 import { enrichOpenApiWithEndpoints } from './openapi-endpoints.js';
 import { buildBuiltinPaths } from './openapi-builtin-paths.js';
 import {
@@ -605,11 +606,11 @@ function rowsToCsv(
  * module's static graph.
  */
 async function createXlsxStream(res: any, useStyles = false): Promise<{
-    ws: any;
+    ws: Worksheet;
     finalize: () => Promise<void>;
 }> {
     const { PassThrough } = await import('node:stream');
-    const ExcelJS: any = (await import('exceljs')).default ?? (await import('exceljs'));
+    const ExcelJS = await loadExcelJs();
 
     const passthrough = new PassThrough();
     const done = new Promise<void>((resolve, reject) => {
 
@@ -0,0 +1,85 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Runtime pins for `xlsx-module.ts` — the single typed, lazily-loaded exceljs
+ * binding both production xlsx paths share.
+ *
+ * The TYPE half of that module (workbooks, worksheets, rows and cells are now
+ * inside tsc's reach) is asserted by tsc itself and cannot be asserted from
+ * here. What CAN rot at runtime is the part that is not a type:
+ *
+ *  - the CommonJS interop (`.default ?? namespace`) the accessor performs. A
+ *    "simplification" that drops either half returns a namespace whose
+ *    `Workbook` is `undefined`, and the failure surfaces only in a deployed
+ *    import or export.
+ *  - both arms of `parseXlsxToRows(buffer: Buffer | ArrayBuffer, …)`. Only the
+ *    Node `Buffer` arm carries the type assertion; the `ArrayBuffer` arm is
+ *    type-checked as it stands. Neither is allowed to change behaviour, so
+ *    both are driven here against bytes the accessor itself produced.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { loadExcelJs } from './xlsx-module.js';
+import { parseXlsxToRows } from './import-prepare.js';
+
+/** A two-row sheet, written through the accessor's own namespace. */
+async function writeFixture(): Promise<Buffer> {
+    const ExcelJS = await loadExcelJs();
+    const wb = new ExcelJS.Workbook();
+    const ws = wb.addWorksheet('Sheet1');
+    ws.addRow(['id', 'title', 'score']);
+    ws.addRow(['a1', 'first', 7]);
+    ws.addRow(['a2', 'second', 9]);
+    return Buffer.from(await wb.xlsx.writeBuffer());
+}
+
+describe('loadExcelJs', () => {
+    it('resolves the exceljs namespace with the interop the call sites used to do inline', async () => {
+        const ExcelJS = await loadExcelJs();
+        // `.default ?? namespace`: drop either half and one of these is undefined.
+        expect(typeof ExcelJS.Workbook).toBe('function');
+        expect(typeof ExcelJS.stream.xlsx.WorkbookWriter).toBe('function');
+        expect(new ExcelJS.Workbook().worksheets).toEqual([]);
+    });
+
+    it('returns the same module record on repeat calls — the load stays cached, not re-fetched', async () => {
+        expect(await loadExcelJs()).toBe(await loadExcelJs());
+    });
+});
+
+describe('parseXlsxToRows keeps both arms of its Buffer | ArrayBuffer parameter', () => {
+    it('reads the Node `Buffer` arm — the one arm the exceljs shim forces an assertion on', async () => {
+        const rows = await parseXlsxToRows(await writeFixture());
+        expect(rows).toEqual([
+            { id: 'a1', title: 'first', score: '7' },
+            { id: 'a2', title: 'second', score: '9' },
+        ]);
+    });
+
+    it('reads the `ArrayBuffer` arm — the arm that stays type-checked, unasserted', async () => {
+        const bytes = await writeFixture();
+        const arrayBuffer = bytes.buffer.slice(
+            bytes.byteOffset,
+            bytes.byteOffset + bytes.byteLength,
+        ) as ArrayBuffer;
+        expect(arrayBuffer).toBeInstanceOf(ArrayBuffer);
+        const rows = await parseXlsxToRows(arrayBuffer);
+        expect(rows).toEqual([
+            { id: 'a1', title: 'first', score: '7' },
+            { id: 'a2', title: 'second', score: '9' },
+        ]);
+    });
+
+    it('honours the sheet selector through the typed `getWorksheet` (its `as any` is gone)', async () => {
+        const ExcelJS = await loadExcelJs();
+        const wb = new ExcelJS.Workbook();
+        wb.addWorksheet('Empty'); // decoy first sheet
+        const ws = wb.addWorksheet('Data');
+        ws.addRow(['id', 'title']);
+        ws.addRow(['x1', 'from-named-sheet']);
+        const bytes = Buffer.from(await wb.xlsx.writeBuffer());
+        expect(await parseXlsxToRows(bytes, {}, 'Data')).toEqual([
+            { id: 'x1', title: 'from-named-sheet' },
+        ]);
+    });
+});