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Add experiment for prefetching #9747

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merged 1 commit into from
Dec 14, 2019
Merged

Add experiment for prefetching #9747

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3 changes: 3 additions & 0 deletions packages/next/build/webpack-config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -677,6 +677,9 @@ export default async function getBaseWebpackConfig(
'process.env.__NEXT_EXPORT_TRAILING_SLASH': JSON.stringify(
config.exportTrailingSlash
),
'process.env.__NEXT_PREFETCH_PRELOAD': JSON.stringify(
config.experimental.prefetchPreload
),
'process.env.__NEXT_DEFER_SCRIPTS': JSON.stringify(
config.experimental.deferScripts
),
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10 changes: 7 additions & 3 deletions packages/next/client/page-loader.js
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Original file line number Diff line number Diff line change
@@ -1,9 +1,13 @@
/* global document, window */
import mitt from '../next-server/lib/mitt'

const prefetchOrPreload = process.env.__NEXT_PREFETCH_PRELOAD
? 'prefetch'
: 'preload'

function supportsPreload(el) {
try {
return el.relList.supports('preload')
return el.relList.supports(prefetchOrPreload)
} catch {
return false
}
Expand All @@ -13,7 +17,7 @@ const hasPreload = supportsPreload(document.createElement('link'))

function preloadLink(url, resourceType) {
const link = document.createElement('link')
link.rel = 'preload'
link.rel = prefetchOrPreload
link.crossOrigin = process.crossOrigin
link.href = url
link.as = resourceType
Expand Down Expand Up @@ -217,7 +221,7 @@ export default class PageLoader {
// its own deduping mechanism.
if (
document.querySelector(
`link[rel="preload"][href^="${url}"], script[data-next-page="${route}"]`
`link[rel="${prefetchOrPreload}"][href^="${url}"], script[data-next-page="${route}"]`
)
) {
return
Expand Down