BroadcastChannel is not a type.

I am trying to use the BroadcastChannel api , to send communication between a service worker and the main thread. Our app is hybrid, currently support web, ios and android.

Even when importing from import 'package:universal_html/html.dart'; I get a compilation error when trying to build for ios, stating that BroadastChannel is not a type. I can click on it and see the definition in html_dart2js.dart. What is going on here?

To replicate:

Import universal html
Use BroacastChannel BroadcastChannel? _channel;
Compile for ios

You can use 1 of the following 2 ways:

Use of conditional imports/exports

Create 'broadcast_channel_stub.dart' to use for mobile:

class BroadcastChannel {
   final String name;

   BroadcastChannel(this.name);

   Stream<dynamic> get onMessage => const Stream.empty();
}

Create 'broadcast_channel_web.dart' to use for web:

export 'dart:html' show BroadcastChannel;

Create 'broadcast_channel.dart' to use for all platforms:

export 'broadcast_channel_stub.dart' if (dart.library.html) 'broadcast_channel_web.dart';

Wait for PR #97 to be merged for use.

@dab246

Thanks @dab246 , awesome, do you have an estimate of when this PR might be merged?

It was merged now.

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BroadcastChannel is not a type. #96

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BroadcastChannel is not a type. #96

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dab246 commented on Mar 25, 2024

jay-athelas commented on Mar 26, 2024

terrier989 commented on Nov 16, 2025

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