feat: make constructor input optional when all params are optional

Commands with only optional query/header params no longer require an
empty {} argument. The input parameter gets hasQuestionToken and the
destructuring uses ?? {} fallback.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: maxholman

__tests__/fixtures/petstore/commands.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-03-17T13:15:35.006Z
+ * Generated on 2026-04-23T13:57:47.210Z
  *
  */
 /** eslint-disable max-classes */
@@ -18,7 +18,8 @@ import type {
 } from "./types.js";
 
 /**
- * Tagged template literal that applies encodeURIComponent to all interpolated values, protecting path integrity from characters like `/` and `#`.
+ * Tagged template literal that applies encodeURIComponent to all interpolated
+ * values, protecting path integrity from characters like `/` and `#`.
  * @example encodePath`/users/${userId}` // "/users/foo%2Fbar"
  */
 function encodePath(
@@ -61,8 +62,8 @@ export class FindPetsCommand extends Command<
 > {
 	public override method = "get" as const;
 
-	constructor(input: FindPetsCommandInput) {
-		const { tags, limit } = input;
+	constructor(input?: FindPetsCommandInput) {
+		const { tags, limit } = input ?? {};
 		super("/pets", undefined, stripUndefined({ tags, limit }));
 	}
 }

__tests__/fixtures/petstore/hono-valibot.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-03-17T13:15:35.006Z
+ * Generated on 2026-04-23T13:57:47.210Z
  *
  */
 

__tests__/fixtures/petstore/main.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-03-17T13:15:35.006Z
+ * Generated on 2026-04-23T13:57:47.210Z
  *
  */
 import {

__tests__/fixtures/petstore/types.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-03-17T13:15:35.006Z
+ * Generated on 2026-04-23T13:57:47.210Z
  *
  */
 

__tests__/fixtures/petstore/valibot.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-03-17T13:15:35.006Z
+ * Generated on 2026-04-23T13:57:47.210Z
  *
  */
 import * as v from "valibot";
@@ -24,7 +24,15 @@ export const petSchema = v.intersect([
 ]);
 export const findPetsCommandQuerySchema = v.strictObject({
 	tags: v.exactOptional(v.array(v.string())),
-	limit: v.exactOptional(v.pipe(v.number(), v.integer())),
+	limit: v.exactOptional(
+		v.pipe(
+			v.string(),
+			v.digits(),
+			v.transform((n) => Number.parseInt(n, 10)),
+			v.number(),
+			v.integer(),
+		),
+	),
 });
 export const addPetCommandBodySchema = newPetSchema;
 export const findPetByIdCommandParamsSchema = v.strictObject({

lib/process-document.ts

@@ -971,6 +971,16 @@ export async function processOpenApiDocument(
 
 					const hasHeaders = !!headerType && headerParameters.length > 0;
 
+					const allInputOptional =
+						!hasParams &&
+						!hasJsonBody &&
+						!hasNonJsonBody &&
+						queryParameters.every((qp) => !qp.required);
+
+					const allHeadersOptional = headerParameters.every(
+						(hp) => !hp.required,
+					);
+
 					if (hasNonJsonBody || hasJsonBody || hasQuery || hasParams || hasHeaders) {
 						const ctor = commandClassDeclaration.addConstructor();
 
@@ -991,12 +1001,14 @@ export async function processOpenApiDocument(
 							const cctorParam = ctor.addParameter({
 								name: "input",
 								type: inputType.getName(),
+								...(allInputOptional && { hasQuestionToken: true }),
 							});
 
 							if (hasHeaders) {
 								ctor.addParameter({
 									name: "headers",
 									type: headerType.getName(),
+									...(allHeadersOptional && { hasQuestionToken: true }),
 								});
 							}
 
@@ -1007,7 +1019,9 @@ export async function processOpenApiDocument(
 									declarations: [
 										{
 											kind: StructureKind.VariableDeclaration,
-											initializer: cctorParam.getName(),
+											initializer: allInputOptional
+											? `${cctorParam.getName()} ?? {}`
+											: cctorParam.getName(),
 											name: iife(() => {
 												switch (true) {
 													case paramsToDestructure.length > 0 && hasNonJsonBody: