TanStackRouter v1
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類型工具

TanStack Router 所公開的大多數類型屬於內部使用，可能會有破壞性變更且不一定易於使用。因此，TanStack Router 提供了一組專注於易用性的公開類型，旨在供外部使用。這些類型在類型層面上提供了與 TanStack Router 運行時概念相同的類型安全體驗，同時保留了在何處進行類型檢查的靈活性。

使用 ValidateLinkOptions 檢查連結選項的類型

ValidateLinkOptions 會對物件字面量類型進行檢查，確保它們在推斷位置符合 Link 選項的規範。例如，你可能有一個通用的 HeadingLink 元件，它接受 title 屬性和 linkOptions，目的是讓這個元件可以重複用於任何導航場景。

tsx
export interface HeaderLinkProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TOptions = unknown,
> {
  title: string
  linkOptions: ValidateLinkOptions<TRouter, TOptions>
}

export function HeadingLink<TRouter extends RegisteredRouter, TOptions>(
  props: HeaderLinkProps<TRouter, TOptions>,
): Solid.JSX.Element
export function HeadingLink(props: HeaderLinkProps): Solid.JSX.Element {
  return (
    <>
      <h1>{props.title}</h1>
      <Link {...props.linkOptions} />
    </>
  )
}

export interface HeaderLinkProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TOptions = unknown,
> {
  title: string
  linkOptions: ValidateLinkOptions<TRouter, TOptions>
}

export function HeadingLink<TRouter extends RegisteredRouter, TOptions>(
  props: HeaderLinkProps<TRouter, TOptions>,
): Solid.JSX.Element
export function HeadingLink(props: HeaderLinkProps): Solid.JSX.Element {
  return (
    <>
      <h1>{props.title}</h1>
      <Link {...props.linkOptions} />
    </>
  )
}

為了避免在泛型簽章中進行類型斷言，這裡使用了更寬鬆的 HeadingLink 重載。在實現 HeadingLink 時，使用不含類型參數的寬鬆簽章是避免類型斷言的簡單方法。

所有工具類型的參數都是可選的，但為了獲得最佳的 TypeScript 性能，公開簽章中的 TRouter 應始終明確指定。而 TOptions 應在推斷位置（如 HeadingLink）使用，以正確推斷 linkOptions 並縮小 params 和 search 的範圍。

這樣做的結果是，以下範例中的 linkOptions 是完全類型安全的：

tsx
<HeadingLink title="Posts" linkOptions={{ to: '/posts' }} />
<HeadingLink title="Post" linkOptions={{ to: '/posts/$postId', params: {postId: 'postId'} }} />

<HeadingLink title="Posts" linkOptions={{ to: '/posts' }} />
<HeadingLink title="Post" linkOptions={{ to: '/posts/$postId', params: {postId: 'postId'} }} />

使用 ValidateLinkOptionsArray 檢查連結選項陣列的類型

所有導航類型工具都有對應的陣列變體。ValidateLinkOptionsArray 可以對 Link 選項的陣列進行類型檢查。例如，你可能有一個通用的 Menu 元件，其中每個項目都是一個 Link。

tsx
export interface MenuProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown> = ReadonlyArray<unknown>,
> {
  items: ValidateLinkOptionsArray<TRouter, TItems>
}

export function Menu<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown>,
>(props: MenuProps<TRouter, TItems>): Solid.JSX.Element
export function Menu(props: MenuProps): Solid.JSX.Element {
  return (
    <ul>
      {props.items.map((item) => (
        <li>
          <Link {...item} />
        </li>
      ))}
    </ul>
  )
}

export interface MenuProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown> = ReadonlyArray<unknown>,
> {
  items: ValidateLinkOptionsArray<TRouter, TItems>
}

export function Menu<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown>,
>(props: MenuProps<TRouter, TItems>): Solid.JSX.Element
export function Menu(props: MenuProps): Solid.JSX.Element {
  return (
    <ul>
      {props.items.map((item) => (
        <li>
          <Link {...item} />
        </li>
      ))}
    </ul>
  )
}

這當然使得以下 items 屬性完全類型安全：

tsx
<Menu
  items={[
    { to: '/posts' },
    { to: '/posts/$postId', params: { postId: 'postId' } },
  ]}
/>

<Menu
  items={[
    { to: '/posts' },
    { to: '/posts/$postId', params: { postId: 'postId' } },
  ]}
/>

也可以為陣列中的每個 Link 選項固定 from。這樣可以讓所有 Menu 項目相對於 from 進行導航。ValidateFromPath 工具可以提供對 from 的額外類型檢查。

tsx
export interface MenuProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown> = ReadonlyArray<unknown>,
  TFrom extends string = string,
> {
  from: ValidateFromPath<TRouter, TFrom>
  items: ValidateLinkOptionsArray<TRouter, TItems, TFrom>
}

export function Menu<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown>,
  TFrom extends string = string,
>(props: MenuProps<TRouter, TItems, TFrom>): Solid.JSX.Element
export function Menu(props: MenuProps): Solid.JSX.Element {
  return (
    <ul>
      {props.items.map((item) => (
        <li>
          <Link {...item} from={props.from} />
        </li>
      ))}
    </ul>
  )
}

export interface MenuProps<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown> = ReadonlyArray<unknown>,
  TFrom extends string = string,
> {
  from: ValidateFromPath<TRouter, TFrom>
  items: ValidateLinkOptionsArray<TRouter, TItems, TFrom>
}

export function Menu<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TItems extends ReadonlyArray<unknown>,
  TFrom extends string = string,
>(props: MenuProps<TRouter, TItems, TFrom>): Solid.JSX.Element
export function Menu(props: MenuProps): Solid.JSX.Element {
  return (
    <ul>
      {props.items.map((item) => (
        <li>
          <Link {...item} from={props.from} />
        </li>
      ))}
    </ul>
  )
}

ValidateLinkOptionsArray 允許通過提供額外的類型參數來固定 from。結果是一個類型安全的 Link 選項陣列，提供相對於 from 的導航。

tsx
<Menu
  from="/posts"
  items={[{ to: '.' }, { to: './$postId', params: { postId: 'postId' } }]}
/>

<Menu
  from="/posts"
  items={[{ to: '.' }, { to: './$postId', params: { postId: 'postId' } }]}
/>

使用 ValidateRedirectOptions 檢查重新導向選項的類型

ValidateRedirectOptions 會對物件字面量類型進行檢查，確保它們在推斷位置符合重新導向選項的規範。例如，你可能需要一個通用的 fetchOrRedirect 函式，它接受 url 和 redirectOptions，目的是在 fetch 失敗時進行重新導向。

tsx
export async function fetchOrRedirect<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TOptions,
>(
  url: string,
  redirectOptions: ValidateRedirectOptions<TRouter, TOptions>,
): Promise<unknown>
export async function fetchOrRedirect(
  url: string,
  redirectOptions: ValidateRedirectOptions,
): Promise<unknown> {
  const response = await fetch(url)

  if (!response.ok && response.status === 401) {
    throw redirect(redirectOptions)
  }

  return await response.json()
}

export async function fetchOrRedirect<
  TRouter extends RegisteredRouter = RegisteredRouter,
  TOptions,
>(
  url: string,
  redirectOptions: ValidateRedirectOptions<TRouter, TOptions>,
): Promise<unknown>
export async function fetchOrRedirect(
  url: string,
  redirectOptions: ValidateRedirectOptions,
): Promise<unknown> {
  const response = await fetch(url)

  if (!response.ok && response.status === 401) {
    throw redirect(redirectOptions)
  }

  return await response.json()
}

這樣做的結果是傳遞給 fetchOrRedirect 的 redirectOptions 是完全類型安全的：

tsx
fetchOrRedirect('http://example.com/', { to: '/login' })

fetchOrRedirect('http://example.com/', { to: '/login' })

使用 ValidateNavigateOptions 檢查導航選項的類型

ValidateNavigateOptions 會對物件字面量類型進行檢查，確保它們在推斷位置符合導航選項的規範。例如，你可能想寫一個自訂鉤子來啟用/停用導航。

tsx
export interface UseConditionalNavigateResult {
  enable: () => void
  disable: () => void
  navigate: () => void
}

export function useConditionalNavigate<
  TRouter extends RegisteredRouter,
  TOptions,
>(
  navigateOptions: ValidateNavigateOptions<TRouter, TOptions>,
): UseConditionalNavigateResult
export function useConditionalNavigate(
  navigateOptions: ValidateNavigateOptions,
): UseConditionalNavigateResult {
  const [enabled, setEnabled] = createSignal(false)
  const navigate = useNavigate()
  return {
    enable: () => setEnabled(true),
    disable: () => setEnabled(false),
    navigate: () => {
      if (enabled) {
        navigate(navigateOptions)
      }
    },
  }
}

export interface UseConditionalNavigateResult {
  enable: () => void
  disable: () => void
  navigate: () => void
}

export function useConditionalNavigate<
  TRouter extends RegisteredRouter,
  TOptions,
>(
  navigateOptions: ValidateNavigateOptions<TRouter, TOptions>,
): UseConditionalNavigateResult
export function useConditionalNavigate(
  navigateOptions: ValidateNavigateOptions,
): UseConditionalNavigateResult {
  const [enabled, setEnabled] = createSignal(false)
  const navigate = useNavigate()
  return {
    enable: () => setEnabled(true),
    disable: () => setEnabled(false),
    navigate: () => {
      if (enabled) {
        navigate(navigateOptions)
      }
    },
  }
}

這樣做的結果是傳遞給 useConditionalNavigate 的 navigateOptions 是完全類型安全的，我們可以根據 React 狀態來啟用/停用導航：

tsx
const { enable, disable, navigate } = useConditionalNavigate({
  to: '/posts/$postId',
  params: { postId: 'postId' },
})

const { enable, disable, navigate } = useConditionalNavigate({
  to: '/posts/$postId',
  params: { postId: 'postId' },
})
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