iOS 9.3 simulator throws "ReferenceError: Can't find variable: SockJS" error for "ng serve -o"

[remisture]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

Angular CLI: 1.5.0
Node: 8.5.0
OS: darwin x64
Angular: 5.0.0
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router

@angular/cli: 1.5.0
@angular/tsc-wrapped: error
@angular-devkit/build-optimizer: 0.0.32
@angular-devkit/core: 0.0.20
@angular-devkit/schematics: 0.0.35
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.8.0
@schematics/angular: 0.1.1
typescript: 2.4.2
webpack: 3.8.1

Repro steps.

• ng serve -o
• Fire up a simulator device with iOS 9.3
• Access your app at localhost:xxxx

The log given by the failure.

ReferenceError: Can't find variable: SockJS

Desired functionality.

Local webserver should work in iOS 9.3

[meiordac]

same for Safari 10.1.2

[G-Nantel]

same here for safari 10.1.1

[Tyler-V]

This is an issue with iOS 10.3.3

[kayode-anthony]

Same on Safari 10.0.2 on Sierra 10.12.2

[dang1412]

Same issue with cli 1.5 here, safari, ios...(not sure the version)

[FilipeQ]

Same problem with ng serve on Safari

[lakinmohapatra]

when its going to be fixed ?

[huhuixin]

Same on Safari 10.1

[Timmaex]

Should this not be fixed soon? It is preventing us from updating cli, because we want our projects to work on Safari...

[danielcrisp]

I've found that disabling sourcemaps is a workaround:

$ ng serve --aot --no-sourcemap