overleaf/services/web/frontend/js/features/pdf-preview/util/pdf-caching-flags.js

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import getMeta from '../../../utils/meta'
import { debugConsole } from '@/utils/debugging'
const hasTextEncoder = typeof TextEncoder !== 'undefined'
if (!hasTextEncoder) {
debugConsole.warn('TextEncoder is not available. Disabling pdf-caching.')
}
const isOpera =
Array.isArray(navigator.userAgentData?.brands) &&
navigator.userAgentData.brands.some(b => b.brand === 'Opera')
if (isOpera) {
debugConsole.warn('Browser cache is limited in Opera. Disabling pdf-caching.')
}
function isFlagEnabled(flag) {
if (!hasTextEncoder) return false
if (isOpera) return false
return getMeta('ol-splitTestVariants')?.[flag] === 'enabled'
}
export const cachedUrlLookupEnabled = isFlagEnabled(
'pdf-caching-cached-url-lookup'
)
export const prefetchingEnabled = isFlagEnabled('pdf-caching-prefetching')
export const prefetchLargeEnabled = isFlagEnabled('pdf-caching-prefetch-large')
export const enablePdfCaching = isFlagEnabled('pdf-caching-mode')
export const trackPdfDownloadEnabled = isFlagEnabled('track-pdf-download')