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import { prepareFlightRouterStateForRequest } from './flight-data-helpers'
import type { FlightRouterState } from '../server/app-render/types'
import { HasLoadingBoundary } from '../server/app-render/types'
describe('prepareFlightRouterStateForRequest', () => {
describe('HMR refresh handling', () => {
it('should preserve complete state for HMR refresh requests', () => {
const flightRouterState: FlightRouterState = [
'__PAGE__?{"sensitive":"data"}',
{},
'/some/url',
'refresh',
true,
1,
]
const result = prepareFlightRouterStateForRequest(flightRouterState, true)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded).toEqual(flightRouterState)
})
})
describe('__PAGE__ segment handling', () => {
it('should strip search params from __PAGE__ segments', () => {
const flightRouterState: FlightRouterState = [
'__PAGE__?{"param":"value","foo":"bar"}',
{},
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[0]).toBe('__PAGE__')
})
it('should preserve non-page segments', () => {
const flightRouterState: FlightRouterState = ['regular-segment', {}]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[0]).toBe('regular-segment')
})
it('should preserve dynamic segments', () => {
const dynamicSegment: [string, string, 'd'] = ['slug', 'test-value', 'd']
const flightRouterState: FlightRouterState = [dynamicSegment, {}]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[0]).toEqual(dynamicSegment)
})
})
describe('URL stripping', () => {
it('should always set URL (index 2) to null', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
'/sensitive/url/path',
null,
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[2]).toBeNull()
})
})
describe('refresh marker handling', () => {
it('should preserve "refetch" marker', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
'/url',
'refetch',
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[3]).toBe('refetch')
})
it('should preserve "inside-shared-layout" marker', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
'/url',
'inside-shared-layout',
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[3]).toBe('inside-shared-layout')
})
it('should strip "refresh" marker (client-only)', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
'/url',
'refresh',
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[3]).toBeNull()
})
it('should strip null refresh marker', () => {
const flightRouterState: FlightRouterState = ['segment', {}, '/url', null]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[3]).toBeNull()
})
})
describe('optional fields preservation', () => {
it('should preserve isRootLayout when true', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
null,
null,
true,
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[4]).toBe(true)
})
it('should preserve isRootLayout when false', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
null,
null,
false,
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[4]).toBe(false)
})
it('should preserve hasLoadingBoundary', () => {
const flightRouterState: FlightRouterState = [
'segment',
{},
null,
null,
undefined,
1, // HasLoadingBoundary value
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[5]).toBe(1)
})
it('should handle minimal FlightRouterState (only segment and parallelRoutes)', () => {
const flightRouterState: FlightRouterState = ['segment', {}]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded).toEqual([
'segment',
{},
null, // URL
null, // refresh marker
])
})
})
describe('recursive processing of parallel routes', () => {
it('should recursively process nested parallel routes', () => {
const flightRouterState: FlightRouterState = [
'parent',
{
children: [
'__PAGE__?{"nested":"param"}',
{},
'/nested/url',
'refresh',
],
modal: ['modal-segment', {}, '/modal/url', 'refetch'],
},
'/parent/url',
'inside-shared-layout',
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded).toEqual([
'parent',
{
children: [
'__PAGE__', // search params stripped
{},
null, // URL stripped
null, // 'refresh' marker stripped
],
modal: [
'modal-segment',
{},
null, // URL stripped
'refetch', // server marker preserved
],
},
null, // URL stripped
'inside-shared-layout', // server marker preserved
])
})
it('should handle deeply nested parallel routes', () => {
const flightRouterState: FlightRouterState = [
'root',
{
children: [
'level1',
{
children: [
'__PAGE__?{"deep":"nesting"}',
{},
'/deep/url',
'refetch',
],
},
],
},
]
const result = prepareFlightRouterStateForRequest(flightRouterState)
const decoded = JSON.parse(decodeURIComponent(result))
expect(decoded[1].children[1].children[0]).toBe('__PAGE__')
expect(decoded[1].children[1].children[2]).toBeNull()
expect(decoded[1].children[1].children[3]).toBe('refetch')
})
})
describe('real-world scenarios', () => {
it('should handle complex FlightRouterState with all features', () => {
const complexState: FlightRouterState = [
'__PAGE__?{"userId":"123"}',
{
children: [
'dashboard',
{
modal: [
'__PAGE__?{"modalParam":"data"}',
{},
'/modal/path',
'refresh',
false,
HasLoadingBoundary.SegmentHasLoadingBoundary,
],
},
'/dashboard/url',
'refetch',
true,
1,
],
sidebar: [['slug', 'user-123', 'd'], {}, '/sidebar/url', null],
},
'/main/url',
'inside-shared-layout',
true,
1,
]
const result = prepareFlightRouterStateForRequest(complexState)
const decoded = JSON.parse(decodeURIComponent(result))
// Root level checks
expect(decoded[0]).toBe('__PAGE__') // search params stripped
expect(decoded[2]).toBeNull() // URL stripped
expect(decoded[3]).toBe('inside-shared-layout') // server marker preserved
expect(decoded[4]).toBe(true) // isRootLayout preserved
expect(decoded[5]).toBe(1) // hasLoadingBoundary preserved
// Children route checks
const childrenRoute = decoded[1].children
expect(childrenRoute[2]).toBeNull() // URL stripped
expect(childrenRoute[3]).toBe('refetch') // server marker preserved
expect(childrenRoute[4]).toBe(true) // isRootLayout preserved
// Modal route checks
const modalRoute = childrenRoute[1].modal
expect(modalRoute[0]).toBe('__PAGE__') // search params stripped
expect(modalRoute[2]).toBeNull() // URL stripped
expect(modalRoute[3]).toBeNull() // 'refresh' marker stripped
expect(modalRoute[4]).toBe(false) // isRootLayout preserved
expect(modalRoute[5]).toBe(HasLoadingBoundary.SegmentHasLoadingBoundary) // hasLoadingBoundary preserved
// Sidebar route (dynamic segment) checks
const sidebarRoute = decoded[1].sidebar
expect(sidebarRoute[0]).toEqual(['slug', 'user-123', 'd']) // dynamic segment preserved
expect(sidebarRoute[2]).toBeNull() // URL stripped
expect(sidebarRoute[3]).toBeNull() // null marker remains null
})
})
})
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