Blazor Client Side : iOS (Preview 6)

[mkArtakMSFT]

From @smjltd on Wednesday, July 3, 2019 6:31:33 PM

Describe the bug

Unable to browse same Blazor Client Side app on iOS 13.0

To Reproduce

Steps to reproduce the behavior:

1. Open Safari/Chrome
2. browse the app
3. See error stuck starting animation

Screenshots

Where as working fine on desktop and android

Copied from original issue: dotnet/aspnetcore#11862

[chucker]

(This is a regression in Safari 13. Safari Version 12.1.1 (14607.2.6.1.1) is not affected.)

[lewing]

I can't reproduce it with Safari Version 13.0 (15608.1.31.1.2) either

[lewing]

Can you attach a test can and provide the exact safari version you are seeing problems with?

[chucker]

@lewing

Output of dotnet --info:

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100-preview7-012821
 Commit:    6348f1068a

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.14
 OS Platform: Darwin
 RID:         osx.10.14-x64
 Base Path:   /usr/local/share/dotnet/sdk/3.0.100-preview7-012821/

Host (useful for support):
  Version: 3.0.0-preview7-27912-14
  Commit:  4da6ee6450

.NET Core SDKs installed:
[..]
  3.0.100-preview7-012821 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
[..]
  Microsoft.AspNetCore.App 3.0.0-preview7.19365.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
[..]
  Microsoft.NETCore.App 3.0.0-preview7-27912-14 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Install a Blazor project template, then create and run an empty project:

dotnet new -i Microsoft.AspNetCore.Blazor.Templates::3.0.0-preview7.19365.7
dotnet new blazor -o Mono15588
cd Mono15588/
dotnet run

Finally, navigate to http://localhost:5000 (or whichever dotnet run outputs).

Safari Technology Preview Release 88 (Safari 13.0, WebKit 14608.1.36) will almost immediately log a console error:

[Error] Unhandled Promise Rejection: TypeError: 'arguments', 'callee', and 'caller' cannot be accessed in this context.
	(anonymous function) (mono.js:1:207498)
	run (mono.js:1:207498)
	runCaller (mono.js:1:207402)
	removeRunDependency (mono.js:1:16179)
	receiveInstance (mono.js:1:17374)
	receiveInstantiatedSource (mono.js:1:17490)
	promiseReactionJob

Version 12.1.1 (14607.2.6.1.1) will not.

[kmiller68]

For what it's worth one of my coworkers investigated this and found the source of the bug... https://bugs.webkit.org/show_bug.cgi?id=201484.

If you want a work around, you can either access WebAssembly.Module/Instance before setting Module or you can put var Module or let Module in the global scope. Let me know or file a bug on bugs.webkit.org if you have any issues. Sorry for the inconvenience... :(

[chucker]

Indeed. Simply putting

<script>var Module;</script>

In your wwwroot/index.html before the Blazor bootstrapper fixes it. Thanks @kmiller68!

[smj0x]

Getting this error.
after adding <script>var Module;</script>

[chucker]

That’s probably #15989.

[smj0x]

Now same thing happening with newly updated safari version 13.0 (14608.1.49)

[frank12001]

I have same issue with iphoneX ios 13.
Dotnet core version is v3.0.0-rc1.
I use the basic template and deploy it on azure appservice. It stay at loading... when i use ios 13 but work fine on ios 12 device.

[kjpou1]

There has been a PR submitted to rectify the <script>var Module;</script> iOS 13.

[smj0x]

doesn't work

[chucker]

@smjltd I've found that applying both the var Module; workaround and replacing the boot script with the one in #16986 helped on iPhone, iPad, Mac (iOS 13.1 with Safari 13, macOS 10.14.6 with Safari 13).

[kjpou1]

I am going to close this for now in favor of #16986 as they are related.