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createOpaqueFallbackRouteParams,
getFallbackRouteParams,
} from './fallback-params'
import type { FallbackRouteParam } from '../../build/static-paths/types'
import type AppPageRouteModule from '../route-modules/app-page/module'
import type { LoaderTree } from '../lib/app-dir-module'
// Helper to create LoaderTree structures for testing
type TestLoaderTree = [
segment: string,
parallelRoutes: { [key: string]: TestLoaderTree },
modules: Record<string, unknown>,
]
function createLoaderTree(
segment: string,
parallelRoutes: { [key: string]: TestLoaderTree } = {},
children?: TestLoaderTree
): TestLoaderTree {
const routes = children ? { ...parallelRoutes, children } : parallelRoutes
return [segment, routes, {}]
}
/**
* Creates a mock AppPageRouteModule for testing.
*/
function createMockRouteModule(loaderTree: LoaderTree): AppPageRouteModule {
return {
userland: {
loaderTree,
},
} as AppPageRouteModule
}
describe('createOpaqueFallbackRouteParams', () => {
describe('opaque object interface', () => {
const fallbackParams: readonly FallbackRouteParam[] = [
{ paramName: 'slug', paramType: 'dynamic' },
{ paramName: 'modal', paramType: 'dynamic' },
]
it('has method works correctly', () => {
const result = createOpaqueFallbackRouteParams(fallbackParams)!
expect(result.has('slug')).toBe(true)
expect(result.has('modal')).toBe(true)
expect(result.has('nonexistent')).toBe(false)
expect(result.has('')).toBe(false)
})
it('get method works correctly', () => {
const result = createOpaqueFallbackRouteParams(fallbackParams)!
expect(result.get('slug')?.[0]).toMatch(/^%%drp:slug:[a-f0-9]+%%$/)
expect(result.get('modal')?.[0]).toMatch(/^%%drp:modal:[a-f0-9]+%%$/)
expect(result.get('nonexistent')).toBeUndefined()
expect(result.get('')).toBeUndefined()
})
it('iterator yields correct entries', () => {
const result = createOpaqueFallbackRouteParams(fallbackParams)!
const entries = Array.from(result.entries())
expect(entries).toHaveLength(2)
const [name, [value]] = entries[0]
expect(name).toBe('slug')
expect(value).toMatch(/^%%drp:slug:[a-f0-9]+%%$/)
})
})
})
describe('getFallbackRouteParams', () => {
describe('Regular Routes (children segments)', () => {
it('should extract single dynamic segment from children route', () => {
// Tree: /[slug]
const loaderTree = createLoaderTree('', {}, createLoaderTree('[slug]'))
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.has('slug')).toBe(true)
expect(result!.get('slug')?.[1]).toBe('d') // 'd' = dynamic (short type)
})
it('should extract multiple nested dynamic segments', () => {
// Tree: /[category]/[slug]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[category]', {}, createLoaderTree('[slug]'))
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[category]/[slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('category')).toBe(true)
expect(result!.has('slug')).toBe(true)
expect(result!.get('category')?.[1]).toBe('d')
expect(result!.get('slug')?.[1]).toBe('d')
})
it('should extract catchall segment', () => {
// Tree: /[...slug]
const loaderTree = createLoaderTree('', {}, createLoaderTree('[...slug]'))
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[...slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('slug')).toBe(true)
expect(result!.get('slug')?.[1]).toBe('c') // 'c' = catchall
})
it('should extract optional catchall segment', () => {
// Tree: /[[...slug]]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[[...slug]]')
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[[...slug]]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('slug')).toBe(true)
expect(result!.get('slug')?.[1]).toBe('oc') // 'oc' = optional-catchall
})
it('should extract mixed static and dynamic segments', () => {
// Tree: /blog/[category]/posts/[slug]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'blog',
{},
createLoaderTree(
'[category]',
{},
createLoaderTree('posts', {}, createLoaderTree('[slug]'))
)
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/blog/[category]/posts/[slug]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('category')).toBe(true)
expect(result!.has('slug')).toBe(true)
})
it('should handle route with no dynamic segments', () => {
// Tree: /blog/posts
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('blog', {}, createLoaderTree('posts'))
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/blog/posts', routeModule)
// Should return null for no fallback params
expect(result).toBeNull()
})
it('should handle partially static routes', () => {
// Tree: /[teamSlug]/[projectSlug] but page is /vercel/[projectSlug]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[teamSlug]', {}, createLoaderTree('[projectSlug]'))
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/vercel/[projectSlug]',
routeModule
)
expect(result).not.toBeNull()
// Only projectSlug should be a fallback param, vercel is static
expect(result!.has('projectSlug')).toBe(true)
expect(result!.has('teamSlug')).toBe(false)
})
})
describe('Route Groups', () => {
it('should ignore route groups when extracting segments', () => {
// Tree: /(marketing)/blog/[slug]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'(marketing)',
{},
createLoaderTree('blog', {}, createLoaderTree('[slug]'))
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/blog/[slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('slug')).toBe(true)
})
it('should handle route groups mixed with static segments', () => {
// Tree: /(app)/dashboard/(users)/[userId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'(app)',
{},
createLoaderTree(
'dashboard',
{},
createLoaderTree('(users)', {}, createLoaderTree('[userId]'))
)
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/dashboard/[userId]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('userId')).toBe(true)
})
})
describe('Parallel Routes', () => {
it('should extract segment from parallel route matching pathname', () => {
// Tree: / -> @modal/[id]
const loaderTree = createLoaderTree('', {
modal: createLoaderTree('[id]'),
})
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[id]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('id')).toBe(true)
})
it('should extract segments from both children and parallel routes', () => {
// Tree: /[lang] -> children + @modal/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[lang]', {
modal: createLoaderTree('[photoId]'),
})
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[lang]/[photoId]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('lang')).toBe(true)
expect(result!.has('photoId')).toBe(true)
})
it('should handle parallel route params that are not in pathname', () => {
// Tree: /[id] -> @modal/[photoId] (photoId is not in pathname /[id])
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[id]', {
modal: createLoaderTree('[photoId]'),
})
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[id]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('id')).toBe(true)
// photoId should also be included as it's a parallel route param
expect(result!.has('photoId')).toBe(true)
})
})
describe('Interception Routes', () => {
it('should extract segment from (.) same-level interception route', () => {
// Tree: /(.)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('(.)photo', {}, createLoaderTree('[photoId]'))
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/(.)photo/[photoId]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('photoId')).toBe(true)
})
it('should extract segment from (..) parent-level interception route', () => {
// Tree: /gallery/(..)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'gallery',
{},
createLoaderTree('(..)photo', {}, createLoaderTree('[photoId]'))
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/gallery/(..)photo/[photoId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('photoId')).toBe(true)
})
it('should extract intercepted param when marker is part of the segment itself', () => {
// Tree: /(.)[photoId] - the interception marker is PART OF the dynamic segment
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('(.)[photoId]')
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[photoId]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('photoId')).toBe(true)
// Should have intercepted type
expect(result!.get('photoId')?.[1]).toBe('di(.)') // 'di(.)' = dynamic-intercepted-(.)'
})
})
describe('Interception Routes in Parallel Routes', () => {
it('should extract segment from interception route in parallel slot', () => {
// Tree: @modal/(.)photo/[photoId]
const loaderTree = createLoaderTree('', {
modal: createLoaderTree('(.)photo', {}, createLoaderTree('[photoId]')),
})
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/(.)photo/[photoId]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('photoId')).toBe(true)
})
it('should extract segments from both children and intercepting parallel route', () => {
// Tree: /[id] -> children + @modal/(.)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[id]', {
modal: createLoaderTree(
'(.)photo',
{},
createLoaderTree('[photoId]')
),
})
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/[id]/(.)photo/[photoId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('id')).toBe(true)
expect(result!.has('photoId')).toBe(true)
})
it('should handle realistic photo gallery pattern with interception', () => {
// Realistic pattern: /photos/[id] with @modal/(.)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'photos',
{},
createLoaderTree('[id]', {
modal: createLoaderTree(
'(.)photo',
{},
createLoaderTree('[photoId]')
),
})
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/photos/[id]/(.)photo/[photoId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('id')).toBe(true)
expect(result!.has('photoId')).toBe(true)
})
})
describe('Complex Mixed Scenarios', () => {
it('should handle route groups + parallel routes + interception routes', () => {
// Tree: /(marketing)/[lang] -> @modal/(.)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'(marketing)',
{},
createLoaderTree('[lang]', {
modal: createLoaderTree(
'(.)photo',
{},
createLoaderTree('[photoId]')
),
})
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/[lang]/(.)photo/[photoId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(2)
expect(result!.has('lang')).toBe(true)
expect(result!.has('photoId')).toBe(true)
})
it('should handle i18n with interception routes', () => {
// Tree: /[locale]/products/[category] -> @modal/(.)product/[productId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'[locale]',
{},
createLoaderTree(
'products',
{},
createLoaderTree('[category]', {
modal: createLoaderTree(
'(.)product',
{},
createLoaderTree('[productId]')
),
})
)
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/[locale]/products/[category]/(.)product/[productId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(3)
expect(result!.has('locale')).toBe(true)
expect(result!.has('category')).toBe(true)
expect(result!.has('productId')).toBe(true)
})
it('should handle partially static i18n route', () => {
// Tree: /[locale]/products/[category] but page is /en/products/[category]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree(
'[locale]',
{},
createLoaderTree('products', {}, createLoaderTree('[category]'))
)
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/en/products/[category]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('category')).toBe(true)
// locale should not be a fallback param because 'en' is static
expect(result!.has('locale')).toBe(false)
})
it('should handle a partially static intercepting route', () => {
// Tree: /[locale]/(.)photo/[photoId] but page is /en/(.)photo/[photoId]
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('[locale]', {
modal: createLoaderTree(
'(.)photo',
{},
createLoaderTree('[photoId]')
),
})
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams(
'/en/(.)photo/[photoId]',
routeModule
)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('photoId')).toBe(true)
// locale should not be a fallback param because 'en' is static
expect(result!.has('locale')).toBe(false)
})
})
describe('Edge Cases', () => {
it('should return null for pathname with no dynamic segments', () => {
const loaderTree = createLoaderTree(
'',
{},
createLoaderTree('blog', {}, createLoaderTree('posts'))
)
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/blog/posts', routeModule)
expect(result).toBeNull()
})
it('should handle empty segment in tree', () => {
// Tree: '' -> [id]
const loaderTree = createLoaderTree('', {}, createLoaderTree('[id]'))
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[id]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('id')).toBe(true)
})
it('should handle root dynamic route', () => {
// Tree: /[slug]
const loaderTree = createLoaderTree('', {}, createLoaderTree('[slug]'))
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('slug')).toBe(true)
})
it('should handle catchall at root', () => {
// Tree: /[...slug]
const loaderTree = createLoaderTree('', {}, createLoaderTree('[...slug]'))
const routeModule = createMockRouteModule(loaderTree)
const result = getFallbackRouteParams('/[...slug]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('slug')).toBe(true)
expect(result!.get('slug')?.[1]).toBe('c') // catchall
})
it('should handle optional catchall in parallel route', () => {
// Tree: @sidebar/[[...optional]]
const loaderTree = createLoaderTree('', {
sidebar: createLoaderTree('[[...optional]]'),
})
const routeModule = createMockRouteModule(loaderTree)
let result = getFallbackRouteParams('/[[...optional]]', routeModule)
expect(result).not.toBeNull()
expect(result!.size).toBe(1)
expect(result!.has('optional')).toBe(true)
expect(result!.get('optional')?.[1]).toBe('oc') // optional-catchall
result = getFallbackRouteParams('/sidebar/is/real', routeModule)
expect(result).toBeNull()
})
})
})
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