➜  functions git:(master) dart run build_runner build --output=build                    
Precompiling executable... (9.8s)
Precompiled build_runner:build_runner.
[INFO] Generating build script completed, took 347ms
[INFO] Precompiling build script... completed, took 5.3s
[WARNING] The package `firebase_functions_interop_test` does not include some required sources in any of its targets (see their build.yaml file).
The missing sources are:
  - $package$
[INFO] Building new asset graph completed, took 736ms
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms
[INFO] build_node_compilers:entrypoint on node/clear.dart:Running dart2js with --minify --packages=.package-87e2be97884c548f61cad2867e7e0f1c -onode/clear.dart.js node/clear.dart
[INFO] build_node_compilers:entrypoint on node/index.dart:Running dart2js with --minify --packages=.package-cf8c3faa3eef4a1678495274bd4c8979 -onode/index.dart.js node/index.dart
[INFO] build_node_compilers:entrypoint on node/clear.dart:Dart2Js finished with:

Compiled 8,964,359 characters Dart to 6,034 characters JavaScript in 0.47 seconds
Dart file node/clear.dart compiled to JavaScript: node/clear.dart.js

[SEVERE] build_node_compilers:entrypoint on node/index.dart:
Dart2Js finished with:

packages/firebase_functions_interop/firebase_functions_interop.dart:203:25:
Error: Null safety features are disabled for this library.
  final js.EventAuthInfo? auth;
                        ^
packages/firebase_functions_interop/firebase_functions_interop.dart:208:15:
Error: Null safety features are disabled for this library.
  final String? authType;
              ^