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import type { FallbackRouteParams } from '../../server/request/fallback-params'
import type { Params } from '../request/params'
import {
createPrerenderResumeDataCache,
createRenderResumeDataCache,
type PrerenderResumeDataCache,
type RenderResumeDataCache,
} from '../resume-data-cache/resume-data-cache'
import { stringifyResumeDataCache } from '../resume-data-cache/resume-data-cache'
export enum DynamicState {
/**
* The dynamic access occurred during the RSC render phase.
*/
DATA = 1,
/**
* The dynamic access occurred during the HTML shell render phase.
*/
HTML = 2,
}
/**
* The postponed state for dynamic data.
*/
export type DynamicDataPostponedState = {
/**
* The type of dynamic state.
*/
readonly type: DynamicState.DATA
/**
* The immutable resume data cache.
*/
readonly renderResumeDataCache: RenderResumeDataCache
}
/**
* The postponed state for dynamic HTML.
*/
export type DynamicHTMLPostponedState = {
/**
* The type of dynamic state.
*/
readonly type: DynamicState.HTML
/**
* The postponed data used by React.
*/
readonly data: object
/**
* The immutable resume data cache.
*/
readonly renderResumeDataCache: RenderResumeDataCache
}
export type PostponedState =
| DynamicDataPostponedState
| DynamicHTMLPostponedState
export async function getDynamicHTMLPostponedState(
data: object,
fallbackRouteParams: FallbackRouteParams | null,
resumeDataCache: PrerenderResumeDataCache | RenderResumeDataCache
): Promise<string> {
if (!fallbackRouteParams || fallbackRouteParams.size === 0) {
const postponedString = JSON.stringify(data)
// Serialized as `<postponedString.length>:<postponedString><renderResumeDataCache>`
return `${postponedString.length}:${postponedString}${await stringifyResumeDataCache(
createRenderResumeDataCache(resumeDataCache)
)}`
}
const replacements: Array<[string, string]> = Array.from(fallbackRouteParams)
const replacementsString = JSON.stringify(replacements)
const dataString = JSON.stringify(data)
// Serialized as `<replacements.length><replacements><data>`
const postponedString = `${replacementsString.length}${replacementsString}${dataString}`
// Serialized as `<postponedString.length>:<postponedString><renderResumeDataCache>`
return `${postponedString.length}:${postponedString}${await stringifyResumeDataCache(resumeDataCache)}`
}
export async function getDynamicDataPostponedState(
resumeDataCache: PrerenderResumeDataCache | RenderResumeDataCache
): Promise<string> {
return `4:null${await stringifyResumeDataCache(createRenderResumeDataCache(resumeDataCache))}`
}
export function parsePostponedState(
state: string,
params: Params | undefined
): PostponedState {
try {
const postponedStringLengthMatch = state.match(/^([0-9]*):/)?.[1]
if (!postponedStringLengthMatch) {
throw new Error(`Invariant: invalid postponed state ${state}`)
}
const postponedStringLength = parseInt(postponedStringLengthMatch)
// We add a `:` to the end of the length as the first character of the
// postponed string is the length of the replacement entries.
const postponedString = state.slice(
postponedStringLengthMatch.length + 1,
postponedStringLengthMatch.length + postponedStringLength + 1
)
const renderResumeDataCache = createRenderResumeDataCache(
state.slice(postponedStringLengthMatch.length + postponedStringLength + 1)
)
try {
if (postponedString === 'null') {
return { type: DynamicState.DATA, renderResumeDataCache }
}
if (/^[0-9]/.test(postponedString)) {
const match = postponedString.match(/^([0-9]*)/)?.[1]
if (!match) {
throw new Error(
`Invariant: invalid postponed state ${JSON.stringify(postponedString)}`
)
}
// This is the length of the replacements entries.
const length = parseInt(match)
const replacements = JSON.parse(
postponedString.slice(
match.length,
// We then go to the end of the string.
match.length + length
)
) as ReadonlyArray<[string, string]>
let postponed = postponedString.slice(match.length + length)
for (const [key, searchValue] of replacements) {
const value = params?.[key] ?? ''
const replaceValue = Array.isArray(value) ? value.join('/') : value
postponed = postponed.replaceAll(searchValue, replaceValue)
}
return {
type: DynamicState.HTML,
data: JSON.parse(postponed),
renderResumeDataCache,
}
}
return {
type: DynamicState.HTML,
data: JSON.parse(postponedString),
renderResumeDataCache,
}
} catch (err) {
console.error('Failed to parse postponed state', err)
return { type: DynamicState.DATA, renderResumeDataCache }
}
} catch (err) {
console.error('Failed to parse postponed state', err)
return {
type: DynamicState.DATA,
renderResumeDataCache: createPrerenderResumeDataCache(),
}
}
}
export function getPostponedFromState(state: PostponedState): any {
if (state.type === DynamicState.DATA) {
return null
}
return state.data
}
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