OWF: ReferenceError: Property 'Buffer' doesn't exist, js engine: hermes

[kezike]

Describe the bug While running the LCW app on a hardware Android device, I encounter the following error:

 ERROR  ReferenceError: Property 'Buffer' doesn't exist, js engine: hermes
 ERROR  Invariant Violation: "main" has not been registered. This can happen if:
* Metro (the local dev server) is run from the wrong folder. Check if Metro is running, stop it and restart it in the current project.
* A module failed to load due to an error and `AppRegistry.registerComponent` wasn't called., js engine: hermes

Additionally, it seems that the Metro recognizes the device to be iOS, considering the value of the platform query parameter of the URL located at the path $.launchAsset.url at http://localhost:8081:

{
  "id": "0bdc1a2b-20ed-4cd0-a460-f8959804efa0",
  "createdAt": "2024-03-07T22:27:22.388Z",
  "runtimeVersion": "1.0.0",
  "launchAsset": {
    "key": "bundle",
    "contentType": "application/javascript",
    "url": "http://127.0.0.1:8081/index.bundle?platform=ios&dev=true&hot=false&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app"
  },
  "assets": [],
  "metadata": {},
  "extra": {
    "eas": {},
    "expoClient": {
      "runtimeVersion": "1.0.0",
      "name": "Learner Credential Wallet",
      "slug": "learner-credential-wallet",
      "version": "1.0.0",
      "orientation": "portrait",
      "icon": "./app/assets/icon.png",
      "backgroundColor": "#1F2937",
      "splash": {
        "image": "./app/assets/splash.png",
        "resizeMode": "contain",
        "backgroundColor": "#1F2937",
        "imageUrl": "http://127.0.0.1:8081/assets/./app/assets/splash.png"
      },
      "updates": {
        "fallbackToCacheTimeout": 0
      },
      "assetBundlePatterns": [
        "**/*"
      ],
      "ios": {
        "supportsTablet": true,
        "bundleIdentifier": "edu.mit.eduwallet",
        "entitlements": {
          "com.apple.security.application-groups": [
            "group.edu.mit.eduwallet"
          ]
        },
        "associatedDomains": [
          "applinks:lcw.app/mobile"
        ],
        "infoPlist": {
          "CFBundleURLTypes": [
            {
              "CFBundleURLSchemes": [
                "dccrequest"
              ]
            }
          ],
          "NSCameraUsageDescription": "$(PRODUCT_NAME) needs access to your Camera to scan QR codes."
        }
      },
      "android": {
        "adaptiveIcon": {
          "foregroundImage": "./app/assets/adaptive-icon.png",
          "backgroundColor": "#1F2937",
          "foregroundImageUrl": "http://127.0.0.1:8081/assets/./app/assets/adaptive-icon.png"
        },
        "intentFilters": [
          {
            "action": "VIEW",
            "autoVerify": false,
            "data": [
              {
                "scheme": "dccrequest",
                "host": "request"
              },
              {
                "scheme": "dccrequest",
                "host": "present"
              }
            ],
            "category": [
              "BROWSABLE",
              "DEFAULT"
            ]
          }
        ],
        "package": "edu.wallet",
        "permissions": [
          "android.permission.CAMERA"
        ]
      },
      "web": {
        "favicon": "./app/assets/favicon.png"
      },
      "plugins": [
        [
          "react-native-vision-camera",
          {
            "cameraPermissionText": "$(PRODUCT_NAME) needs access to your Camera to scan QR codes.",
            "enableMicrophonePermission": false,
            "enableCodeScanner": true
          }
        ]
      ],
      "_internal": {
        "isDebug": false,
        "projectRoot": "/Users/.../learner-credential-wallet",
        "dynamicConfigPath": {},
        "staticConfigPath": "/Users/.../learner-credential-wallet/app.json",
        "packageJsonPath": "/Users/.../learner-credential-wallet/package.json",
        "pluginHistory": {
          "react-native-vision-camera": {
            "name": "react-native-vision-camera",
            "version": "3.9.1"
          }
        }
      },
      "sdkVersion": "50.0.0",
      "platforms": [
        "ios",
        "android"
      ],
      "iconUrl": "http://127.0.0.1:8081/assets/./app/assets/icon.png",
      "hostUri": "127.0.0.1:8081"
    },
    "expoGo": {
      "debuggerHost": "127.0.0.1:8081",
      "developer": {
        "tool": "expo-cli",
        "projectRoot": "/Users/.../learner-credential-wallet"
      },
      "packagerOpts": {
        "dev": true
      },
      "mainModuleName": "index",
      "__flipperHack": "React Native packager is running"
    },
    "scopeKey": "@anonymous/learner-credential-wallet-c93e2f75-6a43-4dad-9a1f-134a820203bb"
  }
}

To Reproduce Steps to reproduce the behavior:

1. Clone LCW repo
2. Run npm i --legacy-peer-deps
3. Run npm run prebuild:android
4. Run npm start in one terminal window
5. Run npm run android in another window
6. Observe error

Expected behavior App should launch on Android device without issue.

Smartphone:

• Device: Galaxy S10

[vonovak]

Hello, I tried to reproduce this given the above steps, but for me the app builds and runs fine. So unfortunately, this is not actionable for me at this point.

With regard to launchAsset, I'm not sure what the field is exactly, but I don't think it's a problem - I see the same stuff when I go to http://localhost:8081/ and the app works for me. Metro doesn't perform any device detection afaik, it just serves what you ask it to serve.

[alexfigtree]

@kezike Not sure what happened, but I can no longer replicate this issue on my end either. Is this still happening for you? If not, we can close this issue.

[alexfigtree]

@dmitrizagidulin Just reproduced this on a fresh install. Re-assigning to @vonovak .

[alexfigtree]

Update: fix in store, but not on main branch yet.

[alexfigtree]

Quick fix still needed before merging PR, then can be moved to Done after main gets deployed to app store: https://github.com/digitalcredentials/learner-credential-wallet/pull/599/files

[alexfigtree]

Deployed to both Google Play and App Store (release 2.1.0-build80), closing ticket.