@molecule/app-routing

Auto-generated, AI-first package reference for the molecule.dev ecosystem. It is written to be read by coding agents as much as by people, and is generated from this package's source — edit src/index.ts JSDoc, not this file.

Client-side routing interface for molecule.dev.

Provides a unified routing API that works across different routing libraries (React Router, Next.js, Vue Router, etc.).

Quick Start

import {
  createBrowserRouter,
  setRouter,
  navigate,
  getParams,
  getQuery,
} from '@molecule/app-routing'

// Wire the router ONCE at app startup (before any navigate/getParams call):
setRouter(
  createBrowserRouter({
    routes: [
      { path: '/', name: 'home' },
      { path: '/projects/:id', name: 'project', requiresAuth: true },
    ],
  }),
)

// Navigate in-app (SPA — no full reload). `replace` skips a history entry.
navigate('/projects/42')
navigate('/login', { replace: true, state: { from: '/projects/42' } })

// Read the current route's params + query string anywhere:
const { id } = getParams<{ id: string }>() // '42' on /projects/:id
const query = getQuery() // { sort: 'recent' } on ?sort=recent

Type

core

Installation

npm install @molecule/app-routing @molecule/app-bond @molecule/app-i18n @molecule/app-logger

API

Interfaces

NavigateOptions

Options for programmatic navigation (replace vs push, carry state, preserve query/hash).

interface NavigateOptions {
  /**
   * Replace current history entry instead of pushing.
   */
  replace?: boolean

  /**
   * State to pass with navigation.
   */
  state?: unknown

  /**
   * Preserve current query params.
   */
  preserveQuery?: boolean

  /**
   * Preserve current hash.
   */
  preserveHash?: boolean
}

RouteDefinition

Route configuration entry (path pattern, name, auth requirements, roles, children).

interface RouteDefinition {
  /**
   * Route path pattern.
   */
  path: string

  /**
   * Route name (for named routes).
   */
  name?: string

  /**
   * Whether the route requires exact matching.
   */
  exact?: boolean

  /**
   * Whether the route requires authentication.
   */
  requiresAuth?: boolean

  /**
   * Required roles/permissions.
   */
  roles?: string[]

  /**
   * Route metadata.
   */
  meta?: Record<string, unknown>

  /**
   * Child routes.
   */
  children?: RouteDefinition[]
}

RouteLocation

Current URL decomposed into pathname, search string, hash, navigation state, and unique key.

interface RouteLocation {
  /**
   * Current pathname.
   */
  pathname: string

  /**
   * Query string (including leading ?).
   */
  search: string

  /**
   * Hash (including leading #).
   */
  hash: string

  /**
   * State data passed with navigation.
   */
  state?: unknown

  /**
   * Unique key for this location.
   */
  key?: string
}

RouteMatch

Result of matching a URL against a route pattern (path, params, query string).

interface RouteMatch<Params extends RouteParams = RouteParams> {
  /**
   * Route path pattern.
   */
  path: string

  /**
   * Matched URL pathname.
   */
  pathname: string

  /**
   * Route parameters.
   */
  params: Params

  /**
   * Whether this is an exact match.
   */
  isExact: boolean
}

Router

Client-side router providing navigation, guards, route matching, and history control.

All routing providers must implement this interface.

interface Router {
  /**
   * Returns the current route location (pathname, search, hash, state).
   */
  getLocation(): RouteLocation

  /**
   * Gets the current route params.
   */
  getParams<T extends RouteParams = RouteParams>(): T

  /**
   * Gets the current query params.
   */
  getQuery(): QueryParams

  /**
   * Gets a specific query parameter.
   */
  getQueryParam(key: string): string | undefined

  /**
   * Gets the current hash.
   */
  getHash(): string

  /**
   * Navigates to a path.
   */
  navigate(path: string, options?: NavigateOptions): void

  /**
   * Navigates to a named route.
   */
  navigateTo(
    name: string,
    params?: RouteParams,
    query?: QueryParams,
    options?: NavigateOptions,
  ): void

  /**
   * Goes back in history.
   */
  back(): void

  /**
   * Goes forward in history.
   */
  forward(): void

  /**
   * Goes to a specific point in history.
   */
  go(delta: number): void

  /**
   * Updates the current query params.
   */
  setQuery(params: QueryParams, options?: NavigateOptions): void

  /**
   * Updates a specific query parameter.
   */
  setQueryParam(key: string, value: string | undefined, options?: NavigateOptions): void

  /**
   * Updates the current hash.
   */
  setHash(hash: string, options?: NavigateOptions): void

  /**
   * Checks if a path matches the current location.
   *
   * @returns `true` if the path matches the current route.
   */
  isActive(path: string, exact?: boolean): boolean

  /**
   * Matches a path pattern against a pathname.
   */
  matchPath<Params extends RouteParams = RouteParams>(
    pattern: string,
    pathname: string,
  ): RouteMatch<Params> | null

  /**
   * Generates a URL from a named route.
   */
  generatePath(name: string, params?: RouteParams, query?: QueryParams): string

  /**
   * Subscribes to route changes.
   */
  subscribe(listener: RouteChangeListener): () => void

  /**
   * Adds a navigation guard.
   */
  addGuard(guard: NavigationGuard): () => void

  /**
   * Registers route definitions.
   */
  registerRoutes(routes: RouteDefinition[]): void

  /**
   * Gets all registered routes.
   */
  getRoutes(): RouteDefinition[]

  /**
   * Destroys the router.
   */
  destroy(): void
}

RouterConfig

Configuration options for creating a router instance.

interface RouterConfig {
  /**
   * Router mode.
   */
  mode?: 'history' | 'hash' | 'memory'

  /**
   * Base path.
   */
  basePath?: string

  /**
   * Initial routes.
   */
  routes?: RouteDefinition[]
}

Types

GuardResult

Navigation guard result.

type GuardResult = boolean | string | { path: string; replace?: boolean } | void

NavigationGuard

Navigation guard function invoked before each navigation. Return false to cancel, a string/path to redirect, or void to allow.

type NavigationGuard = (
  to: RouteLocation,
  from: RouteLocation | null,
) => GuardResult | Promise<GuardResult>

QueryParams

URL query string parameter map (single values or arrays for repeated keys).

type QueryParams = Record<string, string | string[] | undefined>

RouteChangeListener

Callback invoked on each route change with the new location and the navigation action that triggered it.

type RouteChangeListener = (location: RouteLocation, action: 'push' | 'replace' | 'pop') => void

RouteParams

URL path parameter key-value map extracted from dynamic route segments (e.g. { id: '123' }).

type RouteParams = Record<string, string>

Functions

createBrowserRouter(config)

Creates a browser history-based router using the History API (or hash mode). Supports navigation guards, named routes, and route change subscriptions.

function createBrowserRouter(config?: RouterConfig): Router

• config — Router configuration (mode, basePath, initial routes).

Returns: A Router instance bound to the browser history.

createMemoryRouter(config)

Creates an in-memory router for testing and SSR environments. Maintains a synthetic history stack without touching browser APIs.

function createMemoryRouter(config?: RouterConfig & { initialEntries?: string[] }): Router

• config — Router configuration with optional initialEntries for the history stack.

Returns: A Router instance backed by an in-memory history.

generatePath(pattern, params)

Generates a URL path from a route pattern by substituting named parameters.

function generatePath(pattern: string, params?: RouteParams): string

• pattern — Route pattern with :param placeholders (e.g. /users/:id).
• params — Parameter values to substitute into the pattern.

Returns: The generated path with parameters URL-encoded.

getLocation()

Returns the current route location from the bonded router.

function getLocation(): RouteLocation

Returns: The current location (pathname, search, hash, state).

getParams()

Returns the current route parameters from the bonded router.

function getParams(): T

Returns: The current route parameters as a typed record.

getQuery()

Returns the current query parameters from the bonded router.

function getQuery(): QueryParams

Returns: The current query parameters as a record.

getRouter()

Retrieves the bonded router. If none is bonded, automatically creates a browser-based router (in browser environments) or a memory-based router (in SSR/test environments).

function getRouter(): Router

Returns: The active router instance.

matchPath(pattern, pathname, exact)

Matches a route pattern (e.g. /users/:id) against a pathname. Extracts named parameters from the URL.

function matchPath(pattern: string, pathname: string, exact?: boolean): RouteMatch<Params> | null

• pattern — Route pattern with :param placeholders.
• pathname — The actual URL pathname to match against.
• exact — If true, requires a full match (no trailing segments).

Returns: A RouteMatch with extracted params, or null if no match.

navigate(path, options)

Navigates to a path using the bonded router.

function navigate(path: string, options?: NavigateOptions): void

• path — The target path to navigate to.
• options — Navigation options such as replace and state.

Returns: Nothing.

parseQuery(search)

Parses a URL query string (e.g. ?foo=bar&baz=1) into a QueryParams object. Duplicate keys produce string arrays.

function parseQuery(search: string): QueryParams

• search — The query string to parse (with or without leading ?).

Returns: A key-value map of query parameters.

setRouter(router)

Registers a router as the active singleton. Called by bond packages (e.g. @molecule/app-routing-react) during application startup.

function setRouter(router: Router): void

• router — The router implementation to bond.

stringifyQuery(params)

Serializes a QueryParams object into a query string with leading ?. Returns an empty string if no parameters are present.

function stringifyQuery(params: QueryParams): string

• params — The query parameters to serialize.

Returns: The query string (e.g. ?foo=bar&baz=1) or ''.

Available Providers

Provider	Package
Next.js	@molecule/app-routing-next
React Navigation	@molecule/app-routing-react-navigation
React Router	@molecule/app-routing-react-router
Vue Router	@molecule/app-routing-vue-router

Injection Notes

Requirements

Peer dependencies:

• @molecule/app-bond ^1.0.1
• @molecule/app-i18n ^1.0.1
• @molecule/app-logger ^1.0.1

Runtime Dependencies

• @molecule/app-bond
• @molecule/app-i18n
• @molecule/app-logger

Navigate and read the location through this abstraction ({@link navigate}, {@link getParams}, {@link getQuery}, or the framework hook) — do NOT import react-router / vue-router directly or use window.location for in-app navigation; that couples you to one library and loses SPA behavior.

• A {@link NavigationGuard} is UX, NOT security. A client route guard only hides a screen — the REAL protection is your API checking auth + ownership on every request (see the auth skill and the database ownership rule). Never gate sensitive DATA behind a client guard alone; anyone can call the API directly or edit client state.
• Never put a secret or token in a route param or query string. URLs leak into browser history, server logs, and the Referer header — deliver a reset/verify token as a one-time link you validate server-side, and don't persist it client-side afterward.

Translations

Translation strings are provided by @molecule/app-locales-routing.