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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,18 +1,40 @@ | ||
| import { log } from '@guardian/libs'; | ||
| import { isServer } from '../lib/isServer'; | ||
| import { setSchedulerPriorityLastStartTime } from '../lib/scheduler'; | ||
|
|
||
| /** | ||
| * Whether we should adapt the current page to address poor performance issues. | ||
| * Initially this will only happen as part of a @guardian/open-journalism test. | ||
| * | ||
| * It will resolve immediately if `false`, but needs to wait for perf check to | ||
| * complete if you're in the adaptive site test variant. | ||
| */ | ||
| export const shouldAdapt = new Promise<boolean>((resolve) => { | ||
| if (isServer) return resolve(false); | ||
| if (window.location.hash === '#adapt') return resolve(true); | ||
| export const shouldAdapt = async (): Promise<boolean> => { | ||
| if (isServer) return false; | ||
| if (window.location.hash === '#adapt') return true; | ||
| if (window.guardian.config.tests.adaptiveSiteVariant !== 'variant') { | ||
| return resolve(false); | ||
| return false; | ||
| } | ||
|
|
||
| // only evaluate this code if we want to adapt in response to page performance | ||
| return void import( | ||
| const { isPerformingPoorly } = await import( | ||
| /* webpackMode: "eager" */ './poorPerformanceMonitoring' | ||
| ).then(({ isPerformingPoorly }) => isPerformingPoorly.then(resolve)); | ||
| }); | ||
| ); | ||
|
|
||
| return isPerformingPoorly(); | ||
| }; | ||
|
|
||
| /** Hide all placeholders of non-critical islands */ | ||
| const hideAdaptedIslands = () => { | ||
| const style = document.createElement('style'); | ||
| style.innerHTML = `gu-island:not([priority=critical]) [data-name=placeholder] { display: none; }`; | ||
| document.head.appendChild(style); | ||
| }; | ||
|
|
||
| export const adaptSite = (): void => { | ||
| log('openJournalism', '🎛️ Adapting'); | ||
|
|
||
| // disable all tasks except critical ones | ||
| setSchedulerPriorityLastStartTime('feature', 0); | ||
| setSchedulerPriorityLastStartTime('enhancement', 0); | ||
| hideAdaptedIslands(); | ||
| }; |
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