Not able to add custom paramters to flutter build in firebase hosting

[Tomic-Riedel]

[REQUIRED] Environment info

firebase-tools: 12.4.6

Platform: Windows

[REQUIRED] Steps to reproduce

1. Create a Flutter project that supports web and initialize it with Firebase & firebase hosting
2. The app should contain dynamic icons, so that when normally running flutter build web, you'd have to add the --no-tree-shake-icons parameter for it to work
3. Run firebase deploy

[REQUIRED] Expected behavior

It should deploy the app to firebase and recognize, that it has to add this flag OR an option to add custom flags for the build from the firebase deploy command, e.g. firebase deploy --custom "--no-tree-shake-icons". The second option would fix the actual behavior for other cases.

[REQUIRED] Actual behavior

Getting an error that this application cannot tree shake icon.

Logs:

This application cannot tree shake icons fonts. It has non-constant instances of IconData at the following locations:
<List of file paths>
Target web_release_bundle failed: Exception: Avoid non-constant invocations of IconData or try to build again with --no-tree-shake-icons.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:10:3)
#1      IconTreeShaker._findConstants (package:flutter_tools/src/build_system/targets/icon_tree_shaker.dart:307:7)
<asynchronous suspension>
#2      IconTreeShaker._getIconData (package:flutter_tools/src/build_system/targets/icon_tree_shaker.dart:108:45)
<asynchronous suspension>
#3      IconTreeShaker.subsetFont (package:flutter_tools/src/build_system/targets/icon_tree_shaker.dart:172:5)
<asynchronous suspension>
#4      copyAssets.<anonymous closure> (package:flutter_tools/src/build_system/targets/assets.dart:127:25)
<asynchronous suspension>
#5      Future.wait.<anonymous closure> (dart:async/future.dart:525:21)
<asynchronous suspension>
#6      copyAssets (package:flutter_tools/src/build_system/targets/assets.dart:105:3)
<asynchronous suspension>
#7      WebReleaseBundle.build (package:flutter_tools/src/build_system/targets/web.dart:385:29)
<asynchronous suspension>
#8      _BuildInstance._invokeInternal (package:flutter_tools/src/build_system/build_system.dart:847:9)
<asynchronous suspension>
#9      Future.wait.<anonymous closure> (dart:async/future.dart:525:21)
<asynchronous suspension>
#10     _BuildInstance.invokeTarget (package:flutter_tools/src/build_system/build_system.dart:785:32)
<asynchronous suspension>
#11     FlutterBuildSystem.build (package:flutter_tools/src/build_system/build_system.dart:614:16)
<asynchronous suspension>
#12     WebBuilder.buildWeb (package:flutter_tools/src/web/compile.dart:81:34)
<asynchronous suspension>
#13     BuildWebCommand.runCommand (package:flutter_tools/src/commands/build_web.dart:191:5)
<asynchronous suspension>
#14     FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1336:27)
<asynchronous suspension>
#15     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#16     CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>
#17     FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:296:9)
<asynchronous suspension>
#18     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#19     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:244:5)
<asynchronous suspension>
#20     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:91:9)
<asynchronous suspension>
#21     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#22     main (package:flutter_tools/executable.dart:91:3)
<asynchronous suspension>

Compiling lib\main.dart for the Web...                           2.700ms
Exception: Failed to compile application for the Web.

Error: Unable to build your Flutter app

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[joehan]

Sounds like we may need to add a place to specify extra build arguments somewhere (probably as a new field in firebase.json) for frameworks that don't give you a config file to include them in.

[bbuschkaemper]

Had a similar problem (needed to add --dart-define), take a look at #5941:
You can change "source": "." to "public": "build/web" in your firebase.json so that the firebase deploy command won't automatically build flutter. This means you have to manually build before deploying everytime.

[Tomic-Riedel]

Yes, that's what I also did for now, but this sadly is only a workaround for now and not a solution forever 🤷‍♂️

[janek515]

@alexastrum Any ETA on this?

[Sp4Rx]

Had a similar problem (needed to add --dart-define), take a look at #5941: You can change "source": "." to "public": "build/web" in your firebase.json so that the firebase deploy command won't automatically build flutter. This means you have to manually build before deploying everytime.

This one worked. Thank you very much 👍🏻