Execution failed for task ':callstack_polygen:compileDebugKotlin'

[iyarsius]

Before submitting a new issue

• I tested using the latest version of the library, as the bug might be already fixed.
• I tested using a supported version of react native.
• I checked for possible duplicate issues, with possible answers.

Bug summary

Hello, i was trying to make polygen work in my Expo project and when i try to build my project using expo run:android i got the following error:

> Task :callstack_polygen:compileDebugKotlin FAILED
e: file:///home/iyari/Documents/Code/Menta/App/node_modules/@callstack/polygen/android/src/main/java/com/wasm/WasmModule.kt:10:3 'getName' overrides nothing
e: file:///home/iyari/Documents/Code/Menta/App/node_modules/@callstack/polygen/android/src/main/java/com/wasm/WasmModule.kt:17:3 'multiply' overrides nothing
e: file:///home/iyari/Documents/Code/Menta/App/node_modules/@callstack/polygen/android/src/main/java/com/wasm/WasmPackage.kt:12:41 Type mismatch: inferred type is WasmModule but NativeModule? was expected
e: file:///home/iyari/Documents/Code/Menta/App/node_modules/@callstack/polygen/android/src/newarch/WasmSpec.kt:6:3 Unresolved reference: NativeWasmSpec

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':callstack_polygen:compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Compilation error. See log for more details

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

So i followed the readme and i got the error mentioned above. My RN version is 0.76.9 with new architecture (expo ^52.0.46). I dont even know what is causing the issue. So i hope you can help me to understand better what's happening.

Library version

^0.2.1

Environment info

System:
  OS: Linux 6.14 Fedora Linux 42 (Workstation Edition)
  CPU: (12) x64 AMD Ryzen 5 5600 6-Core Processor
  Memory: 856.47 MB / 15.50 GB
  Shell:
    version: 5.2.37
    path: /bin/bash
Binaries:
  Node:
    version: 22.14.0
    path: ~/.nvm/versions/node/v22.14.0/bin/node
  Yarn: Not Found
  npm:
    version: 10.9.2
    path: ~/.nvm/versions/node/v22.14.0/bin/npm
  Watchman:
    version: 2025.03.10.00
    path: /home/linuxbrew/.linuxbrew/bin/watchman
SDKs:
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
Languages:
  Java:
    version: 17.0.9
    path: /home/iyari/.sdkman/candidates/java/current/bin/javac
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 18.0.0
    wanted: latest
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.9
    wanted: 0.76.9
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false

Steps to reproduce

• sudo dnf install wabt
• npx @callstack/polygen init
• selected yes
• then i updated the config file:

import {
  localModule,
  polygenConfig,
} from '@callstack/polygen-config';

/**
 * @type {import('@callstack/polygen/config').PolygenConfig}
 */
export default polygenConfig({
  /**
   * Output configuration
   */
  output: {
    /**
     * Directory where the output files will be stored.
     */
    // directory: 'node_modules/.polygen-out'
  },

  /**
   * Configuration for the `scan` command.
   */
  scan: {
    /**
     * List of paths to scan for modules.
     *
     * Each item is a glob pattern that can use wildcards, or be used
     * to ignore specific element by prefixing it by `!`.
     */
    // paths: [
    //     "src/**/*.wasm",
    // ]
  },

  /**
   * List of modules to be used in the project.
   *
   * Each module can be individually configured, by passing options object as a second
   * argument (or 3rd, for external modules).
   */
  modules: [
    // localModule('src/wasm/module.wasm')
    localModule('node_modules/evmole/dist/evmole_bg.wasm')
  ],
});

• npx polygen scan:

✔ Scanning for WebAssembly modules
ℹ Found 0 WebAssembly module(s) 0 new, 1 removed

• npx polygen generate:

ℹ Generating code for 1 WebAssembly module(s)                                                                                             07:46:01
✔ Processing local module node_modules/evmole/dist/evmole_bg.wasm
ℹ   Found 30 imports (30 functions, 0 memories, 0 globals, 0 tables)                                                                      07:46:01
ℹ   Found 18 exports (16 functions, 1 memories, 0 globals, 1 tables)                                                                      07:46:01
✔ Generating host module
✔ Generated import wbg bridge                                                                                                             07:46:01
ℹ Run pod install to regenerate XCode project and make sure new source files are included                                                 07:46:01

• Added polyfills in imports
• npm i -D @callstack/polygen-metro-config
• updated metro.config:

const { getDefaultConfig } = require("expo/metro-config");
const { withPolygenConfig } = require('@callstack/polygen-metro-config');

module.exports = (() => {
  const config = getDefaultConfig(__dirname);

  const { transformer, resolver } = config;

// Configures the transformer to handle SVG files using react-native-svg-transformer.
  // This allows importing SVGs as React components.
  config.transformer = {
    ...transformer,
    babelTransformerPath: require.resolve("react-native-svg-transformer/expo"),
  };

  config.resolver = {
// Configures the module resolver.
  // - unstable_enablePackageExports: Enables support for "exports" in package.json (needed for some dependencies).
  // - assetExts: Excludes 'svg' from default asset extensions as we treat them as source code.
  // - sourceExts: Adds 'svg' to source file extensions so Metro processes them via the transformer.
    ...resolver,
    unstable_enablePackageExports: true,
    assetExts: resolver.assetExts.filter((ext) => ext !== "svg"),
    sourceExts: [...resolver.sourceExts, "svg"],

    extraNodeModules: {
      ...resolver.extraNodeModules,
    },
  };

  return withPolygenConfig(config);
})();

And run npx expo run:android.

Reproducible sample code

It's not a bug in the code but in the setup. The only way to reproduce is to install the module in my version of expo and RN.

[jpvieirapereira]

same problem here.