bug: dart types for queries with optional input fail to generate

[supplier-storefront-dev]

Provide environment information

[✓] Flutter (Channel stable, 3.29.2, on macOS 15.4 24E248 darwin-arm64, locale en-US) [747ms]
• Flutter version 3.29.2 on channel stable at /Users/user/code/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision c236373904 (4 weeks ago), 2025-03-13 16:17:06 -0400
• Engine revision 18b71d647a
• Dart version 3.7.2
• DevTools version 2.42.3

[!] Android toolchain - develop for Android devices (Android SDK version 35.0.1) [466ms]
• Android SDK at /Users/user/Library/Android/sdk
✗ cmdline-tools component is missing
Run path/to/sdkmanager --install "cmdline-tools;latest"
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run flutter doctor --android-licenses to accept the SDK licenses.
See https://flutter.dev/to/macos-android-setup for more details.

[✓] Xcode - develop for iOS and macOS (Xcode 16.3) [1,031ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16E140
• CocoaPods version 1.16.2

[✓] Chrome - develop for the web [16ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.3) [15ms]
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)

[✓] VS Code (version 1.99.1) [14ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.108.0

[✓] Connected device (4 available) [6.2s]
• iPhone 16 Pro (mobile) • AC4C69F8-8A29-4995-9C45-D4686325872B • ios • com.apple.CoreSimulator.SimRuntime.iOS-18-4
(simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 15.4 24E248 darwin-arm64
• Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin • macOS 15.4 24E248 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 135.0.7049.85

[✓] Network resources [1,371ms]
• All expected network resources are available.

! Doctor found issues in 1 category.

Describe the bug

thanks for this tool. i'm happy to help debug but i am new to flutter. I would need some assistance on where to look. Some of my types are failing to generate when the input field to the trpc route is optional .

Link to reproduction

n/a

To reproduce

create a trpc router like so:

const GetSupplierRequest = z.object({
  ids: z.array(z.string()),
});
export const supplierRouter = createTRPCRouter({
  get: orgProcedure
    .input(GetSupplierRequest.optional())
    .query(async ({ ctx, input }) => {
// ...
    }),
});

follow commands from README

Additional information

json from trpc-extracted

    "supplier.get": {
      "path": "supplier.get",
      "routeType": "query",
      "input": {
        "anyOf": [
          {
            "not": {}
          },
          {
            "type": "object",
            "properties": {
              "ids": {
                "type": "array",
                "items": {
                  "type": "string"
                }
              }
            },
            "required": [
              "ids"
            ],
            "additionalProperties": false
          }
        ],
        "$schema": "http://json-schema.org/draft-07/schema#"
      },
      "output": null
    }

trpc.router.dart

class _R$supplier_get {
  final TRPCClient _client;
  const _R$supplier_get(this._client);
  Future<void> query(Supplier_getInput input) async {
    final response =
        await _client.query('supplier.get', payload: input.toJson());
    final returnData = response.unwrap();
  }
}

[polvallverdu]

Hey! Thank you for using trpc-client-dart. The JSON schema conversion is pretty limited, hopefully zod v4 solves this. In the meantime, can you try using nullable instead of optional?

So it would be:

const GetSupplierRequest = z.object({
  ids: z.array(z.string()),
});
export const supplierRouter = createTRPCRouter({
  get: orgProcedure
    .input(GetSupplierRequest.nullable())
    .query(async ({ ctx, input }) => {
// ...
    }),
});