capacitor-http-wasm-issue

This repo is a reproduction sample app for what appears to be an issue in Capacitor.

The sample app uses the following libraries at these approximate versions

• Capacitor - 4.5.0
• Angular - 15.0.0
• Ionic Angular - 6.3.8

The app uses the Ionic Angular "blank" starter app. It also uses the esri ArcGIS API for JavaScript v3.x which loads a WASM file.

Setup

• Set up your dev environment for Capacitor development by following the official docs here.
• From the terminal in the root of the repo, run the following commands
  • npm install
  • npm run cap.build

Running the App

You can use either Capacitor's Live Reload feature or manually build the app (front-end and native) and deploy the native app again. Changes to the native layer will require a subsequent native app build and deployment.

Live Reload

• Reference: https://capacitorjs.com/docs/guides/live-reload

• Works like an ionic serve in which the WebView is reloaded after updating TypeScript, HTML, CSS, etc. It prompts for the device/emulator you'd like to deploy to, runs a cap sync, starts an ionic serve, builds the native app, and deploys the native app to the device/emulator.

• Run the command

  • cap.run.ios or cap.run.android
    • This command is comprised of
      • npx ionic cap run <platform> --livereload --external
        • Using the --external option
          • Uses a server URL for the WebView that is not localhost but rather loads ionic serve content remotely from your desktop computer using the computer's IP address.
          • Allows JavaScript source mapping to work when debugging the Android WebView.
          • Required for device use but not necessarily for emulators which can successfully load content from the desktop computer using localhost. However, without providing this option you will not get JavaScript source mapping when debugging the Android WebView on an emulator.
          • Allows for livereloads to occur without a USB connection.
          • Some privileged Web APIs (for example, Geolocation) that only work when using SSL or localhost may not work with the app hosted at an IP address. Self-signed certificates do not appear to be an option.

• Your computer and device must be on the same WiFi network. VPNs could potentially cause problems.

  • There may be multiple network interfaces detected so at the prompt choose the one which is your local IP address. See here for help finding your IP.

• Devices may need to be connected via USB for the native build deployment but can thereafter get livereload updates of the front-end build without needing a wired connection.

  • The device will continue to get livereload updates even after restarting the dev server when using a previous native deployment so long as you continue serving on the same IP. This means that you can have an Android and iOS device both running the same build and get the same updates although they must have been built in succession with a closing of the command before moving onto the other.

• When the deployment is finished, capacitor.config.json, AndroidManifest.xml, and AndroidManifest.xml.orig may appear as pending changes in source control. They contain temporary configuration changes necessary to facilitate livereload. They should be automatically removed from pending changes upon Ctrl + C of the process but manual removal may occasionally be necessary if the clean-up step fails.

Manual Build and Deploy

• To build the front-end and copy the files to the native app, run
  • npm run cap.build
• Open the native IDE (if it's not already open) with
  • npx cap open ios or npx cap open android
• Use the native IDE to build and deploy the native app.

Debugging the App

iOS

To debug the WebView, follow the instructions here to use the Safari Web Inspector. To debug the native app, run it in Xcode and view the native logs.

Android

To debug the WebView, follow the instructions here to use the Chrome Dev Tools inspector. To debug the native app, run it in Android Studio and view the native logs.

Steps to Reproduce

• Get the app running by following Running the App for iOS or Android.
• Once the app is running, open the Safari Web Inspector/Chrome Dev Tools inspector by following instructions in Debugging the App. Open the Console view.
• There is one button in the app's UI: Load WASM.
  • The click event will be handled in /src/app/home/home.page.ts.
  • The app will use esri-loader to load an AMD module and then use it. Using it will result in a network request to download and process a WASM file. The network requests will use the CapacitorHttp plugin at a lower-level.
• Click the Load WASM button.
  • In the console, you'll see the CapacitorHttp request and result objects for https://js.arcgis.com/3.42/esri/geometry/support/pe-wasm.wasm. There will also be the following:
    • iOS
      • Warning: wasm streaming compile failed: CompileError: WebAssembly.Module doesn't parse at byte 0: expected a module of at least 8 bytes
      • Warning: falling back to ArrayBuffer instantiation
      • Warning: failed to asynchronously prepare wasm: CompileError: WebAssembly.Module doesn't parse at byte 0: expected a module of at least 8 bytes
      • Warning: Aborted(CompileError: WebAssembly.Module doesn't parse at byte 0: expected a module of at least 8 bytes)
      • Error: error: Uncaught (in promise): Error: CompileError: WebAssembly.Module doesn't parse at byte 0: expected a module of at least 8 bytes
      • Error: Error: Uncaught (in promise): RuntimeError: Aborted(CompileError: WebAssembly.Module doesn't parse at byte 0: expected a module of at least 8 bytes). Build with -sASSERTIONS for more info.
    • Android
      • Warning: wasm streaming compile failed: CompileError: WebAssembly.instantiateStreaming(): unexpected end of stream @+3456147
      • Warning: falling back to ArrayBuffer instantiation
      • Warning: failed to asynchronously prepare wasm: CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13
      • Warning: Aborted(CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13)
      • Error: ERROR Error: Uncaught (in promise): Error: CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13 Error: CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13
      • Error: ERROR Error: Uncaught (in promise): RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13). Build with -sASSERTIONS for more info. RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): expected 9396207 bytes, fell off end @+13). Build with -sASSERTIONS for more info.