diff --git a/packages/types/src/namespace.test-d.ts b/packages/types/src/namespace.test-d.ts
new file mode 100644
index 0000000..950be57
--- /dev/null
+++ b/packages/types/src/namespace.test-d.ts
@@ -0,0 +1,158 @@
+import type * as OpenAPIV3_0 from '@openapi-spec/types/v3.0'
+import type * as OpenAPIV3_1 from '@openapi-spec/types/v3.1'
+import type * as OpenAPIV3_2 from '@openapi-spec/types/v3.2'
+
+// Every export of every version entry, used as a type through a namespace
+// import. A member that exists only as a value fails with TS2749, the way
+// `OpenAPIV3_1.TagObject` did in 0.1.0. `namespace.test.ts` fails when an
+// export is missing from these lists.
+
+export type V3_0Members = [
+  OpenAPIV3_0.ApiKeySecuritySchemeObject,
+  OpenAPIV3_0.AuthorizationCodeOAuthFlowObject,
+  OpenAPIV3_0.CallbackObject,
+  OpenAPIV3_0.ClientCredentialsOAuthFlowObject,
+  OpenAPIV3_0.ComponentsObject,
+  OpenAPIV3_0.ContactObject,
+  OpenAPIV3_0.DiscriminatorObject,
+  OpenAPIV3_0.EncodingObject,
+  OpenAPIV3_0.ExampleObject,
+  OpenAPIV3_0.ExternalDocumentationObject,
+  OpenAPIV3_0.HeaderObject,
+  OpenAPIV3_0.HttpSecuritySchemeObject,
+  OpenAPIV3_0.ImplicitOAuthFlowObject,
+  OpenAPIV3_0.InfoObject,
+  OpenAPIV3_0.LicenseObject,
+  OpenAPIV3_0.LinkObject,
+  OpenAPIV3_0.MediaTypeObject,
+  OpenAPIV3_0.OAuth2SecuritySchemeObject,
+  OpenAPIV3_0.OAuthFlowObject,
+  OpenAPIV3_0.OAuthFlowObjectBase,
+  OpenAPIV3_0.OAuthFlowsObject,
+  OpenAPIV3_0.OpenAPIObject,
+  OpenAPIV3_0.OpenIdConnectSecuritySchemeObject,
+  OpenAPIV3_0.OperationObject,
+  OpenAPIV3_0.ParameterLocation,
+  OpenAPIV3_0.ParameterObject,
+  OpenAPIV3_0.ParameterStyle,
+  OpenAPIV3_0.PasswordOAuthFlowObject,
+  OpenAPIV3_0.PathItemObject,
+  OpenAPIV3_0.PathsObject,
+  OpenAPIV3_0.QueryParameterStyle,
+  OpenAPIV3_0.ReferenceObject,
+  OpenAPIV3_0.RequestBodyObject,
+  OpenAPIV3_0.ResponseObject,
+  OpenAPIV3_0.ResponsesObject,
+  OpenAPIV3_0.SchemaObject,
+  OpenAPIV3_0.SchemaObjectType,
+  OpenAPIV3_0.SecurityRequirementObject,
+  OpenAPIV3_0.SecuritySchemeObject,
+  OpenAPIV3_0.SecuritySchemeType,
+  OpenAPIV3_0.ServerObject,
+  OpenAPIV3_0.ServerVariableObject,
+  OpenAPIV3_0.SpecificationExtensions,
+  OpenAPIV3_0.TagObject,
+  OpenAPIV3_0.XMLObject,
+]
+
+export type V3_1Members = [
+  OpenAPIV3_1.ApiKeySecuritySchemeObject,
+  OpenAPIV3_1.AuthorizationCodeOAuthFlowObject,
+  OpenAPIV3_1.CallbackObject,
+  OpenAPIV3_1.ClientCredentialsOAuthFlowObject,
+  OpenAPIV3_1.ComponentsObject,
+  OpenAPIV3_1.ContactObject,
+  OpenAPIV3_1.DiscriminatorObject,
+  OpenAPIV3_1.EncodingObject,
+  OpenAPIV3_1.ExampleObject,
+  OpenAPIV3_1.ExternalDocumentationObject,
+  OpenAPIV3_1.HeaderObject,
+  OpenAPIV3_1.HttpSecuritySchemeObject,
+  OpenAPIV3_1.ImplicitOAuthFlowObject,
+  OpenAPIV3_1.InfoObject,
+  OpenAPIV3_1.LicenseObject,
+  OpenAPIV3_1.LinkObject,
+  OpenAPIV3_1.MediaTypeObject,
+  OpenAPIV3_1.MutualTlsSecuritySchemeObject,
+  OpenAPIV3_1.OAuth2SecuritySchemeObject,
+  OpenAPIV3_1.OAuthFlowObject,
+  OpenAPIV3_1.OAuthFlowObjectBase,
+  OpenAPIV3_1.OAuthFlowsObject,
+  OpenAPIV3_1.OpenAPIObject,
+  OpenAPIV3_1.OpenIdConnectSecuritySchemeObject,
+  OpenAPIV3_1.OperationObject,
+  OpenAPIV3_1.ParameterLocation,
+  OpenAPIV3_1.ParameterObject,
+  OpenAPIV3_1.ParameterStyle,
+  OpenAPIV3_1.PasswordOAuthFlowObject,
+  OpenAPIV3_1.PathItemObject,
+  OpenAPIV3_1.PathsObject,
+  OpenAPIV3_1.QueryParameterStyle,
+  OpenAPIV3_1.ReferenceObject,
+  OpenAPIV3_1.RequestBodyObject,
+  OpenAPIV3_1.ResponseObject,
+  OpenAPIV3_1.ResponsesObject,
+  OpenAPIV3_1.SchemaObject,
+  OpenAPIV3_1.SchemaObjectFields,
+  OpenAPIV3_1.SchemaObjectType,
+  OpenAPIV3_1.SecurityRequirementObject,
+  OpenAPIV3_1.SecuritySchemeObject,
+  OpenAPIV3_1.SecuritySchemeType,
+  OpenAPIV3_1.ServerObject,
+  OpenAPIV3_1.ServerVariableObject,
+  OpenAPIV3_1.SpecificationExtensions,
+  OpenAPIV3_1.TagObject,
+  OpenAPIV3_1.XMLObject,
+]
+
+export type V3_2Members = [
+  OpenAPIV3_2.ApiKeySecuritySchemeObject,
+  OpenAPIV3_2.AuthorizationCodeOAuthFlowObject,
+  OpenAPIV3_2.CallbackObject,
+  OpenAPIV3_2.ClientCredentialsOAuthFlowObject,
+  OpenAPIV3_2.ComponentsObject,
+  OpenAPIV3_2.ContactObject,
+  OpenAPIV3_2.DeviceAuthorizationOAuthFlowObject,
+  OpenAPIV3_2.DiscriminatorObject,
+  OpenAPIV3_2.EncodingObject,
+  OpenAPIV3_2.ExampleObject,
+  OpenAPIV3_2.ExternalDocumentationObject,
+  OpenAPIV3_2.HeaderObject,
+  OpenAPIV3_2.HttpSecuritySchemeObject,
+  OpenAPIV3_2.ImplicitOAuthFlowObject,
+  OpenAPIV3_2.InfoObject,
+  OpenAPIV3_2.LicenseObject,
+  OpenAPIV3_2.LinkObject,
+  OpenAPIV3_2.MediaTypeObject,
+  OpenAPIV3_2.MutualTlsSecuritySchemeObject,
+  OpenAPIV3_2.OAuth2SecuritySchemeObject,
+  OpenAPIV3_2.OAuthFlowObject,
+  OpenAPIV3_2.OAuthFlowObjectBase,
+  OpenAPIV3_2.OAuthFlowsObject,
+  OpenAPIV3_2.OpenAPIObject,
+  OpenAPIV3_2.OpenIdConnectSecuritySchemeObject,
+  OpenAPIV3_2.OperationObject,
+  OpenAPIV3_2.ParameterLocation,
+  OpenAPIV3_2.ParameterObject,
+  OpenAPIV3_2.ParameterStyle,
+  OpenAPIV3_2.PasswordOAuthFlowObject,
+  OpenAPIV3_2.PathItemObject,
+  OpenAPIV3_2.PathsObject,
+  OpenAPIV3_2.QueryParameterStyle,
+  OpenAPIV3_2.ReferenceObject,
+  OpenAPIV3_2.RequestBodyObject,
+  OpenAPIV3_2.ResponseObject,
+  OpenAPIV3_2.ResponsesObject,
+  OpenAPIV3_2.SchemaObject,
+  OpenAPIV3_2.SchemaObjectFields,
+  OpenAPIV3_2.SchemaObjectType,
+  OpenAPIV3_2.SecurityRequirementObject,
+  OpenAPIV3_2.SecuritySchemeObject,
+  OpenAPIV3_2.SecuritySchemeType,
+  OpenAPIV3_2.ServerObject,
+  OpenAPIV3_2.ServerVariableObject,
+  OpenAPIV3_2.SpecificationExtensions,
+  OpenAPIV3_2.TagObject,
+  OpenAPIV3_2.XMLNodeType,
+  OpenAPIV3_2.XMLObject,
+]
diff --git a/packages/types/src/namespace.test.ts b/packages/types/src/namespace.test.ts
new file mode 100644
index 0000000..6b868ac
--- /dev/null
+++ b/packages/types/src/namespace.test.ts
@@ -0,0 +1,49 @@
+import { readFileSync } from 'node:fs'
+import { fileURLToPath } from 'node:url'
+import ts from 'typescript'
+
+const testFile = fileURLToPath(new URL('./namespace.test-d.ts', import.meta.url))
+const pkg = JSON.parse(readFileSync(new URL('../package.json', import.meta.url), 'utf8'))
+
+const program = ts.createProgram([testFile], {
+  module: ts.ModuleKind.ESNext,
+  moduleResolution: ts.ModuleResolutionKind.Bundler,
+  noEmit: true,
+})
+const checker = program.getTypeChecker()
+const source = program.getSourceFile(testFile)!
+
+const namespaces = new Map<string, { exported: string[], referenced: Set<string> }>()
+const specifiers: string[] = []
+
+for (const statement of source.statements) {
+  const bindings = ts.isImportDeclaration(statement) && statement.importClause?.namedBindings
+  if (bindings && ts.isNamespaceImport(bindings)) {
+    const specifier = statement.moduleSpecifier as ts.StringLiteral
+    const module = checker.getSymbolAtLocation(specifier)!
+    specifiers.push(specifier.text)
+    namespaces.set(bindings.name.text, {
+      exported: checker.getExportsOfModule(module).map(symbol => symbol.name).sort(),
+      referenced: new Set(),
+    })
+  }
+}
+
+source.forEachChild(function visit(node) {
+  if (ts.isQualifiedName(node) && ts.isIdentifier(node.left))
+    namespaces.get(node.left.text)?.referenced.add(node.right.text)
+  node.forEachChild(visit)
+})
+
+it('imports every version entry as a namespace', () => {
+  const entries = Object.keys(pkg.exports)
+    .filter(entry => entry !== './package.json')
+    .map(entry => `${pkg.name}/${entry.slice(2)}`)
+
+  expect(specifiers.sort()).toEqual(entries.sort())
+})
+
+it.each([...namespaces])('references every %s member as a type', (_, { exported, referenced }) => {
+  expect(exported.length).toBeGreaterThan(0)
+  expect([...referenced].sort()).toEqual(exported)
+})