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payload.ts
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payload.ts
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import { parseURL, joinURL } from 'ufo'
import { useNuxtApp } from '../nuxt'
import { useHead, useRuntimeConfig } from '..'
interface LoadPayloadOptions {
fresh?: boolean
hash?: string
}
export function loadPayload (url: string, opts: LoadPayloadOptions = {}) {
if (process.server) { return null }
const payloadURL = _getPayloadURL(url, opts)
const nuxtApp = useNuxtApp()
const cache = nuxtApp._payloadCache = nuxtApp._payloadCache || {}
if (cache[url]) {
return cache[url]
}
cache[url] = _importPayload(payloadURL).then((payload) => {
if (!payload) {
delete cache[url]
return null
}
return payload
})
return cache[url]
}
export function preloadPayload (url: string, opts: LoadPayloadOptions = {}) {
const payloadURL = _getPayloadURL(url, opts)
useHead({
link: [
{ rel: 'modulepreload', href: payloadURL }
]
})
}
// --- Internal ---
function _getPayloadURL (url: string, opts: LoadPayloadOptions = {}) {
const parsed = parseURL(url)
if (parsed.search) {
throw new Error('Payload URL cannot contain search params: ' + url)
}
const hash = opts.hash || (opts.fresh ? Date.now() : '')
return joinURL(useRuntimeConfig().app.baseURL, parsed.pathname, hash ? `_payload.${hash}.js` : '_payload.js')
}
async function _importPayload (payloadURL: string) {
if (process.server) { return null }
const res = await import(/* webpackIgnore: true */ /* @vite-ignore */ payloadURL).catch((err) => {
console.warn('[nuxt] Cannot load payload ', payloadURL, err)
})
return res?.default || null
}
export function isPrerendered () {
// Note: Alternative for server is checking x-nitro-prerender header
const nuxtApp = useNuxtApp()
return !!nuxtApp.payload.prerenderedAt
}