Detect Angular server context

[devknoll]

Detects pages using Angular SSR and SSG

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Test websites:

• https://angular.dev/
• https://angular.io/
• https://svelte.dev/

[github-actions]

Custom metrics for https://almanac.httparchive.org/en/2022/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240109_N2_6

Custom metrics for https://angular.dev/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240109_H2_7
Changed custom metrics values:

{
    "_aurora": {
        "ng_version": "17.0.0-rc.1",
        "ng_img_user": null,
        "ng_priority_img_count": null,
        "ng_server_context": "ssg",
        "nuxt_version": null,
        "nuxt_vue_version": null,
        "react_version": null,
        "svelte_version": null,
        "feature_flags": [
            "NgHydration",
            "NgDefer",
            "NgAfterNextRender",
            "NgHttpTransferCache"
        ]
    }
}

Custom metrics for https://angular.io/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240109_8H_8
Changed custom metrics values:

{
    "_aurora": {
        "ng_version": "17.0.0",
        "ng_img_user": null,
        "ng_priority_img_count": null,
        "ng_server_context": null,
        "nuxt_version": null,
        "nuxt_vue_version": null,
        "react_version": null,
        "svelte_version": null,
        "feature_flags": [
            "NgControlFlow"
        ]
    }
}

Custom metrics for https://svelte.dev/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240109_6Q_9
Changed custom metrics values:

{
    "_aurora": {
        "ng_version": null,
        "ng_img_user": null,
        "ng_priority_img_count": null,
        "ng_server_context": null,
        "nuxt_version": null,
        "nuxt_vue_version": null,
        "react_version": null,
        "svelte_version": "4",
        "feature_flags": []
    }
}