@@ -0,0 +1,51 @@
+---
+"@objectstack/spec": patch
+---
+
+refactor(spec): 双源 C11 收敛 — `HttpRequest` 类型别名改为 re-export `./shared` 的唯一声明 (#4688)
+
+`HttpRequest` 这个名字过去在 `@objectstack/spec/shared` 和 `@objectstack/spec/ui` 解析到**两份不同的类型声明**,是 `dual-source-exports.baseline.json` 上的一行(#4411 陷阱)。现在 `./ui` 直接 re-export `./shared` 的那一份,平台只剩一个声明。
+
+基线 **19 → 18**。
+
+## 为什么是 patch 而不是 major —— 消费者侧零类型差异,已实证
+
+#4535 主单把 v17 的三个双源簇统称 breaking。**本簇不是**,原因是这一簇和其它簇形状不同:
+
+`HttpRequestSchema` **从来只有一份声明**(在 `shared/http.zod.ts`)。`ui/view.zod.ts` 一直是 `import` 进来再原样 re-export 的,所以基线里根本没有 `HttpRequestSchema` 行。被判为双源的只有 `ui/view.zod.ts` 底部那个**本地类型别名**:
+
+```ts
+// FROM —— ./ui 的本地 infer(第二个类型声明符号)
+export type HttpRequest = z.infer< typeof HttpRequestSchema >;
+
+// TO —— re-export ./shared 的唯一声明
+export type { HttpRequest } from '../shared/http.zod';
+```
+
+两者 `z.infer` 的是**同一个** schema 对象,所以解析出来的类型逐字段相同。这不是推断,是编译器验过的:
+
+```ts
+type Equal< X, Y > = (< T >() => T extends X ? 1 : 2) extends (< T >() => T extends Y ? 1 : 2) ? true : false;
+type Assert< T extends true > = T;
+
+type PreFixUiHttpRequest = z.infer< typeof HttpRequestSchema >;   // FROM,逐字复刻旧那行
+type _A = Assert< Equal< PreFixUiHttpRequest, SharedHttpRequest > >;  // ✅ 通过
+type _B = Assert< Equal< PreFixUiHttpRequest, UiHttpRequest > >;      // ✅ 通过(FROM === TO)
+type _NEG = Assert< Equal< UiHttpRequest, { totallyDifferent: true } > >;  // ❌ TS2344,证明上面两条不是空转
+```
+
+配套证据:`api-surface.json` 零改动(名字、入口、kind 全部不变),`authorable-surface.json` 零改动,无 tombstone,无 ADR-0087 conversion —— 因为没有任何可作者化的 key 或运行时行为发生变化。
+
+**所以升级者无需做任何事。** 没有 FROM → TO 迁移动作,`import type { HttpRequest } from '@objectstack/spec/ui'` 和 `from '@objectstack/spec/shared'` 都照旧可用,且现在保证指向同一个声明。谎报破坏和漏报破坏一样会污染升级指南,故按实际情况定级为 patch。
+
+## 回归 pin
+
+`src/ui/view.test.ts` 新增三条**运行时**断言(#4642 已证本包的编译期 pin 空转:`tsconfig.json` 排除 `**/*.test.ts`,vitest 也不开 `typecheck`)。其中第三条用 TypeScript compiler API 在 `src/` 上做符号身份解析 —— 因为 `HttpRequest` 是**类型**,运行时看不见它,而这恰恰是本簇唯一改动的东西。三条已 sabotage 验证会红:
+
+- 还原旧的本地 infer 别名 → `expected 'src/ui/view.zod.ts:2056' to be 'src/shared/http.zod.ts:54'`
+- 删掉 re-export 不补 → ``./ui must still export the name `HttpRequest` ``
+- 在 `./ui` 重新声明第二份 `HttpRequestSchema` → 运行时身份断言失败
+
+## 未纳入:紧邻的 `HttpMethod`
+
+`ui/view.zod.ts` 下一行的 `export type HttpMethod = z.infer< typeof HttpMethodSchema >` 是**完全相同的形状**,基线行 `HttpMethod — [./api, ./shared (type)] ≠ [./ui (type)]` 仍在。#4535 已把它排进 v18,范围由维护者定,故本 PR 不动它。
@@ -13,7 +13,6 @@
     "FieldMapping — [./data (type)] ≠ [./integration (type)] ≠ [./shared (type)]",
     "FieldMappingSchema — [./data (const)] ≠ [./integration (const)] ≠ [./shared (const)]",
     "HttpMethod — [./api, ./shared (type)] ≠ [./ui (type)]",
-    "HttpRequest — [./shared (type)] ≠ [./ui (type)]",
     "PackageDependency — [./cloud (type)] ≠ [./kernel (type)]",
     "PackageDependencySchema — [./cloud (const)] ≠ [./kernel (const)]",
     "RateLimitConfig — [./integration (type)] ≠ [./shared (type)]",
 
@@ -2639,6 +2639,103 @@ describe('HttpMethodSchema/HttpRequestSchema backward compat', () => {
   });
 });
 
+// ─── [#4688] Dual-source regression pin ──────────────────────────────
+//
+// RUNTIME assertions, deliberately. #4642 established that a compile-time pin in
+// `packages/spec` is a no-op: `tsconfig.json` excludes `**/*.test.ts` and
+// `vitest.config.ts` never enables `typecheck`, so neither path type-checks a
+// test file. A conditional-type `Assert< Equal< … > >` here would be dead text —
+// and so, for the same reason, is the bare `type HttpRequest` import at the top
+// of this file: vitest's transform erases it, so it proves nothing about the
+// export still existing. The third test below is what actually proves that.
+//
+// What these defend: `HttpRequest` naming ONE declaration across both published
+// entries. `HttpRequestSchema` was never duplicated — `./ui` imports and
+// re-exports `./shared`'s const — so the only thing that ever split was the type
+// alias, which is exactly the part runtime cannot see. Hence two layers.
+describe('[#4688] HttpRequest is single-source across ./shared and ./ui', () => {
+  it('both entry points expose the very same schema declaration at runtime', async () => {
+    const sharedEntry = await import('../shared/index');
+    const uiEntry = await import('../ui/index');
+
+    // Identity, not shape: `lazySchema` returns one Proxy per declaration site,
+    // so two declarations could never be `toBe`-equal however alike they look.
+    // A re-introduced local `HttpRequestSchema` in view.zod.ts fails here.
+    expect(uiEntry.HttpRequestSchema).toBe(sharedEntry.HttpRequestSchema);
+  });
+
+  it('the shared declaration validates identically on both entries', async () => {
+    const sharedEntry = await import('../shared/index');
+    const uiEntry = await import('../ui/index');
+
+    for (const [entry, schema] of [
+      ['./shared', sharedEntry.HttpRequestSchema],
+      ['./ui', uiEntry.HttpRequestSchema],
+    ] as const) {
+      expect(schema.parse({ url: '/api/data' }), `${entry} defaults method to GET`)
+        .toEqual({ url: '/api/data', method: 'GET' });
+      expect(() => schema.parse({}), `${entry} requires url`).toThrow();
+    }
+  });
+
+  // The load-bearing one. `HttpRequest` is a TYPE — erased before any runtime
+  // assertion can see it — so the two tests above would stay green if the
+  // re-export were deleted or replaced by a second local `z.infer` alias, which
+  // is the entire defect #4688 fixed. This resolves the export through its alias
+  // chain to the ORIGINAL declaration: the same symbol-identity measurement
+  // `check:dual-source-exports` makes, but over `src/` so it runs in `pnpm test`
+  // without a build. It also pins that `./ui` still EXPORTS the name at all —
+  // the compatibility promise this file's own `type HttpRequest` import rests on.
+  it('both entry points resolve the TYPE to the one declaration in shared/http.zod.ts', async () => {
+    const ts = (await import('typescript')).default;
+    const { resolve, relative, dirname } = await import('node:path');
+    const { fileURLToPath } = await import('node:url');
+
+    const specDir = resolve(dirname(fileURLToPath(import.meta.url)), '../..');
+    const entries = {
+      './shared': resolve(specDir, 'src/shared/index.ts'),
+      './ui': resolve(specDir, 'src/ui/index.ts'),
+    };
+    const program = ts.createProgram(Object.values(entries), {
+      module: ts.ModuleKind.ESNext,
+      moduleResolution: ts.ModuleResolutionKind.Bundler,
+      skipLibCheck: true,
+      noEmit: true,
+    });
+    const checker = program.getTypeChecker();
+    const unalias = (s: import('typescript').Symbol) =>
+      s.getFlags() & ts.SymbolFlags.Alias ? checker.getAliasedSymbol(s) : s;
+
+    const origins = new Map<string, string>();
+    for (const [sub, file] of Object.entries(entries)) {
+      const sf = program.getSourceFile(file);
+      const moduleSym = sf && checker.getSymbolAtLocation(sf);
+      // Without this, a resolution failure would make every assertion below
+      // pass vacuously — the exact way a gate goes dormant.
+      expect(moduleSym, `${sub} module symbol must resolve`).toBeTruthy();
+
+      const exported = checker
+        .getExportsOfModule(moduleSym!)
+        .find((e) => e.getName() === 'HttpRequest');
+      expect(exported, `${sub} must still export the name \`HttpRequest\``).toBeTruthy();
+
+      const decl = unalias(exported!).declarations?.[0];
+      expect(decl, `${sub}'s HttpRequest must have a declaration`).toBeTruthy();
+      const declFile = decl!.getSourceFile();
+      origins.set(
+        sub,
+        `${relative(specDir, declFile.fileName)}:${
+          declFile.getLineAndCharacterOfPosition(decl!.getStart()).line + 1
+        }`,
+      );
+    }
+
+    // Same file AND same line — one declaration reached by two import paths.
+    expect(origins.get('./ui')).toBe(origins.get('./shared'));
+    expect(origins.get('./shared')).toMatch(/^src\/shared\/http\.zod\.ts:\d+$/);
+  });
+});
+
 describe('ADR-0089 — visibleWhen unification (view form)', () => {
   it('normalizes a deprecated `visibleOn` alias to `visibleWhen` on a form field', () => {
     const parsed = FormFieldSchema.parse({ field: 'state', visibleOn: "record.country == 'US'" });
 
@@ -36,6 +36,23 @@ const VIEW_HISTORY =
 
 export { HttpMethodSchema, HttpRequestSchema };
 
+/**
+ * [#4688] `HttpRequest` is RE-EXPORTED from its one declaration in
+ * `shared/http.zod.ts` — never re-inferred here.
+ *
+ * The line this replaces was `export type HttpRequest = z.infer< typeof
+ * HttpRequestSchema >` in the alias block at the bottom of this file. It looked
+ * single-source: it inferred from the very schema object imported above, so the
+ * resolved shape was identical. But it was a SECOND type declaration carrying
+ * one name, and symbol identity — not shape — is what
+ * `check:dual-source-exports` measures, and what an auto-import or a model
+ * completion resolves by. That is how `./shared` and `./ui` came to name two
+ * different declarations `HttpRequest` (the #4411 trap). A re-export keeps every
+ * existing `import type { HttpRequest } from '@objectstack/spec/ui'` working
+ * while leaving exactly one declaration that could ever diverge.
+ */
+export type { HttpRequest } from '../shared/http.zod';
+
 /**
  * View Data Source Configuration
  * Supports three modes:
@@ -2036,7 +2053,11 @@ export type SelectionConfig = z.infer<typeof SelectionConfigSchema>;
 export type NavigationConfig = z.infer<typeof NavigationConfigSchema>;
 export type PaginationConfig = z.infer<typeof PaginationConfigSchema>;
 export type ViewData = z.infer<typeof ViewDataSchema>;
-export type HttpRequest = z.infer<typeof HttpRequestSchema>;
+// `HttpRequest` is NOT inferred here — it is re-exported from its single
+// declaration in `shared/http.zod.ts` next to the schema re-export at the top of
+// this file (#4688). Re-adding `= z.infer<typeof HttpRequestSchema>` below would
+// re-create the dual-source row this change removed, even though the inferred
+// shape is identical.
 export type HttpMethod = z.infer<typeof HttpMethodSchema>;
 export type ColumnSummary = z.infer<typeof ColumnSummarySchema>;
 export type ColumnSummaryConfig = z.infer<typeof ColumnSummaryConfigSchema>;