docs: include JSDoc in website API markers

This commit is contained in:
Tianyi Cui
2026-07-19 14:14:02 +08:00
parent 7747aa450c
commit 9163f61299
32 changed files with 1479 additions and 12 deletions
+100
View File
@@ -12,6 +12,15 @@ A context is a proxy: normal property reads go through the service resolver, whi
### ctx.extend(meta?)
```ts website-api
/**
* Create a child context with extra metadata on top of the current scope.
*
* The child prototypally inherits every property of this context; own
* properties of `meta` shadow the inherited ones. The parent is not mutated.
*
* @param meta — own properties (including symbol keys) to define on the child.
* @returns a child context inheriting from this one.
*/
extend(meta = {}): this
```
@@ -27,6 +36,18 @@ The child prototypally inherits every property of this context; own properties o
### ctx.isolate(name, label?)
```ts website-api
/**
* Create a child context with an independent service scope for `name`.
*
* Below the returned context, reads and writes of the service `name`
* resolve against the new label instead of the parent's, so a different
* implementation can be provided without affecting the parent scope.
* Passing the same `label` to two `isolate()` calls joins their scopes.
*
* @param name — the service name to isolate.
* @param label — scope label to join; defaults to a fresh unique symbol.
* @returns a child context whose `name` service resolves in the new scope.
*/
isolate(name: string, label?: symbol)
```
@@ -43,6 +64,18 @@ Below the returned context, reads and writes of the service `name` resolve again
### ctx.intercept(name, config)
```ts website-api
/**
* Add service-specific intercept config for plugins started below this
* context.
*
* Plugins loaded under the returned context see `config` merged into the
* service's resolved config (ancestor entries first; see
* `Service[symbols.resolveConfig]`). The parent context is not affected.
*
* @param name — the service name whose config to intercept.
* @param config — the intercept config to merge for that service.
* @returns a child context carrying the additional intercept entry.
*/
intercept<K extends InjectKey>(name: K, config: Context[K] extends { [symbols.config]: infer T } ? T : never): this
intercept(name: string, config: any): this
```
@@ -60,6 +93,7 @@ Plugins loaded under the returned context see `config` merged into the service's
### ctx.root
```ts website-api
/** The root context of the application (every child context shares it). @experimental */
root: this
```
@@ -70,6 +104,7 @@ The root context of the application (every child context shares it). @experiment
### ctx.baseUrl
```ts website-api
/** Base URL used to resolve relative plugin/module specifiers, if the runtime sets one. */
baseUrl?: string
```
@@ -80,6 +115,7 @@ Base URL used to resolve relative plugin/module specifiers, if the runtime sets
### ctx.events
```ts website-api
/** The event bus. Its methods are also mixed onto `ctx` (`ctx.on`, `ctx.emit`, ...). */
events: EventsService
```
@@ -90,6 +126,7 @@ The event bus. Its methods are also mixed onto `ctx` (`ctx.on`, `ctx.emit`, ...)
### ctx.logger
```ts website-api
/** The logging service. Call `ctx.logger(name)` for a named logger. */
logger: LoggerService
```
@@ -100,6 +137,7 @@ The logging service. Call `ctx.logger(name)` for a named logger.
### ctx.reflect
```ts website-api
/** The reflection layer backing the context proxy (`ctx.get`, `ctx.provide`, ...). */
reflect: ReflectService
```
@@ -110,6 +148,7 @@ The reflection layer backing the context proxy (`ctx.get`, `ctx.provide`, ...).
### ctx.registry
```ts website-api
/** The plugin registry. Its methods are mixed onto `ctx` (`ctx.plugin`, `ctx.inject`). */
registry: RegistryService
```
@@ -122,6 +161,7 @@ The plugin registry. Its methods are mixed onto `ctx` (`ctx.plugin`, `ctx.inject
### Context.effect
```ts website-api
/** Symbol key under which a disposer exposes its {@link EffectMeta} diagnostics tree. */
static readonly effect: unique symbol
```
@@ -132,6 +172,7 @@ Symbol key under which a disposer exposes its EffectMeta diagnostics tree.
### Context.filter
```ts website-api
/** Symbol key for a context's listener filter, consulted on every event dispatch. */
static readonly filter: unique symbol
```
@@ -142,6 +183,7 @@ Symbol key for a context's listener filter, consulted on every event dispatch.
### Context.isolate
```ts website-api
/** Symbol key of the isolation map (see the `Context[symbols.isolate]` property). */
static readonly isolate: unique symbol
```
@@ -152,6 +194,7 @@ Symbol key of the isolation map (see the `Context[symbols.isolate]` property).
### Context.intercept
```ts website-api
/** Symbol key of the intercept map (see the `Context[symbols.intercept]` property). */
static readonly intercept: unique symbol
```
@@ -162,6 +205,15 @@ Symbol key of the intercept map (see the `Context[symbols.intercept]` property).
### Context.is(value)
```ts website-api
/**
* Returns true for Cordis context proxies and context prototypes.
*
* Works across realms and across multiple copies of cordis, because the
* brand is keyed by a global symbol rather than by `instanceof`.
*
* @param value — the value to test.
* @returns `true` if `value` is a Cordis context, narrowing its type.
*/
static is(value: any): value is Context
```
@@ -179,6 +231,14 @@ Works across realms and across multiple copies of cordis, because the brand is k
### ctx.get(name, strict?)
```ts website-api
/**
* Read a service from the store without the inject requirement.
*
* @param name — the service name.
* @param strict — when `true` (default), only return implementations
* whose providing fiber is currently active.
* @returns the service value, or `undefined` when not (yet) provided.
*/
get<K extends string & keyof this>(name: K, strict?: boolean): undefined | this[K]
get(name: string, strict?: boolean): any
```
@@ -195,6 +255,15 @@ Read a service from the store without the inject requirement.
### ctx.set(name, value)
```ts website-api
/**
* Overwrite a provided service's value.
*
* Only the fiber that provided the service may set it; setting an
* unprovided name throws.
*
* @param name — the service name.
* @param value — the new service value.
*/
set<K extends string & keyof this>(name: K, value: undefined | this[K]): void
set(name: string, value: any): void
```
@@ -210,6 +279,18 @@ Only the fiber that provided the service may set it; setting an unprovided name
### ctx.provide(name, value)
```ts website-api
/**
* Register a service implementation owned by the current fiber.
*
* The service becomes visible to dependents in the same isolation scope
* once the fiber is active; it is unregistered (waking dependents) when
* the returned disposer runs or the fiber unloads. Throws if the name is
* already provided in this scope or declared as an accessor.
*
* @param name — the service name.
* @param value — the service value.
* @returns a disposer that unregisters the service.
*/
provide<K extends string & keyof this>(name: K, value: undefined | this[K]): () => void
provide(name: string, value?: any): () => void
```
@@ -227,6 +308,15 @@ The service becomes visible to dependents in the same isolation scope once the f
### ctx.accessor(name, options)
```ts website-api
/**
* Define a computed context property backed by get/set hooks.
*
* The accessor is removed when the current fiber unloads. Throws if the
* name is already declared.
*
* @param name — the context property name.
* @param options — the `get` hook and optional `set` hook.
*/
accessor(name: string, options: Omit<Property.Accessor, 'type'>): void
```
@@ -241,6 +331,16 @@ The accessor is removed when the current fiber unloads. Throws if the name is al
### ctx.mixin(name, mixins)
```ts website-api
/**
* Expose selected members of a service directly on `ctx`.
*
* Each mixed-in key becomes an accessor that forwards to the service
* (binding methods to it), so e.g. `ctx.on` forwards to `ctx.events.on`.
* Mixins are removed when the current fiber unloads.
*
* @param name — the context property holding the source service.
* @param mixins — keys to forward, or a source-key → ctx-key map.
*/
mixin<K extends string & keyof this>(name: K, mixins: (keyof this & keyof this[K])[] | Dict<string>): void
mixin<T extends {}>(source: T, mixins: (keyof this & keyof T)[] | Dict<string>): void
```
+62
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@@ -7,6 +7,13 @@ The event system mixed into every context. Harness-defined events are cataloged
### ctx.parallel(name, ...args)
```ts website-api
/**
* Dispatch an event, running all listeners concurrently.
*
* @param name — the event name.
* @param args — arguments passed to every listener.
* @returns a promise resolving once every listener has settled.
*/
parallel<K extends keyof Events>(name: K, ...args: Parameters<Events[K]>): Promise<void>
parallel<K extends keyof Events>(thisArg: NoInfer<ThisType<Events[K]>>, name: K, ...args: Parameters<Events[K]>): Promise<void>
```
@@ -23,6 +30,12 @@ Dispatch an event, running all listeners concurrently.
### ctx.emit(name, ...args)
```ts website-api
/**
* Dispatch an event synchronously, ignoring listener return values.
*
* @param name — the event name.
* @param args — arguments passed to every listener.
*/
emit<K extends keyof Events>(name: K, ...args: Parameters<Events[K]>): void
emit<K extends keyof Events>(thisArg: NoInfer<ThisType<Events[K]>>, name: K, ...args: Parameters<Events[K]>): void
```
@@ -37,6 +50,13 @@ Dispatch an event synchronously, ignoring listener return values.
### ctx.serial(name, ...args)
```ts website-api
/**
* Dispatch an event, awaiting listeners in order until one bails.
*
* @param name — the event name.
* @param args — arguments passed to each listener.
* @returns the first bail value (non-null, non-false, non-undefined), if any.
*/
serial<K extends keyof Events>(name: K, ...args: Parameters<Events[K]>): Promisify<ReturnType<Events[K]>>
serial<K extends keyof Events>(thisArg: NoInfer<ThisType<Events[K]>>, name: K, ...args: Parameters<Events[K]>): Promisify<ReturnType<Events[K]>>
```
@@ -53,6 +73,13 @@ Dispatch an event, awaiting listeners in order until one bails.
### ctx.bail(name, ...args)
```ts website-api
/**
* Dispatch an event, calling listeners in order until one bails.
*
* @param name — the event name.
* @param args — arguments passed to each listener.
* @returns the first bail value (non-null, non-false, non-undefined), if any.
*/
bail<K extends keyof Events>(name: K, ...args: Parameters<Events[K]>): ReturnType<Events[K]>
bail<K extends keyof Events>(thisArg: NoInfer<ThisType<Events[K]>>, name: K, ...args: Parameters<Events[K]>): ReturnType<Events[K]>
```
@@ -69,6 +96,16 @@ Dispatch an event, calling listeners in order until one bails.
### ctx.waterfall(name, ...args)
```ts website-api
/**
* Dispatch an event whose last argument is a `next` continuation.
*
* Each listener wraps the rest of the chain: calling `next()` invokes the
* next listener (finally the built-in behavior); not calling it vetoes.
*
* @param name — the event name.
* @param args — listener arguments; the final one is the innermost `next`.
* @returns the outermost listener's return value.
*/
waterfall<K extends keyof Events>(name: K, ...args: Parameters<Events[K]>): ReturnType<Events[K]>
waterfall<K extends keyof Events>(thisArg: NoInfer<ThisType<Events[K]>>, name: K, ...args: Parameters<Events[K]>): ReturnType<Events[K]>
```
@@ -86,6 +123,14 @@ Each listener wraps the rest of the chain: calling `next()` invokes the next lis
### ctx.on(name, listener, options?)
```ts website-api
/**
* Register an event listener owned by the current fiber.
*
* @param name — the event name to listen for.
* @param listener — called with the dispatch arguments.
* @param options — listener options; a boolean is shorthand for `prepend`.
* @returns a disposer removing the listener; `true` if it was still registered.
*/
on<K extends keyof Events>(name: K, listener: Events[K], options?: boolean | EventOptions): () => boolean
```
@@ -102,6 +147,14 @@ Register an event listener owned by the current fiber.
### ctx.once(name, listener, options?)
```ts website-api
/**
* Same as `on()`, but the listener disposes itself after its first call.
*
* @param name — the event name to listen for.
* @param listener — called at most once with the dispatch arguments.
* @param options — listener options; a boolean is shorthand for `prepend`.
* @returns a disposer removing the listener; `true` if it was still registered.
*/
once<K extends keyof Events>(name: K, listener: Events[K], options?: boolean | EventOptions): () => boolean
```
@@ -120,6 +173,7 @@ Same as `on()`, but the listener disposes itself after its first call.
Options accepted by `ctx.on()` and `ctx.once()`.
```ts website-api
/** Options accepted by `ctx.on()` and `ctx.once()`. */
interface EventOptions {
/** Add the listener before existing listeners for the same event. */
prepend?: boolean
@@ -136,6 +190,14 @@ Event dispatch strategy used by the event service.
`emit` runs synchronous listeners without awaiting them, `parallel` awaits all listeners together, `serial` awaits them in order until one bails, `bail` stops on the first synchronous bail value, and `waterfall` composes listeners around a final `next` callback.
```ts website-api
/**
* Event dispatch strategy used by the event service.
*
* `emit` runs synchronous listeners without awaiting them, `parallel` awaits
* all listeners together, `serial` awaits them in order until one bails,
* `bail` stops on the first synchronous bail value, and `waterfall` composes
* listeners around a final `next` callback.
*/
type DispatchMode = 'emit' | 'parallel' | 'serial' | 'bail' | 'waterfall'
```
+86
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@@ -7,6 +7,19 @@ A fiber is one loaded plugin instance: its lifecycle state, validated config, an
### ctx.effect(execute, label?)
```ts website-api
/**
* Register a cleanup-aware effect on this fiber.
*
* `execute` runs immediately; the disposers it produces are collected and
* run (in reverse order) either when the returned disposer is called or
* when the fiber unloads, whichever comes first. Calling the disposer twice
* is a no-op. Throws `CordisError('INACTIVE_EFFECT')` if the fiber is
* already disposed, and `TypeError` if `execute` returns an invalid shape.
*
* @param execute — the effect body; see {@link Effect} for accepted shapes.
* @param label — effect label shown in `getEffects()` diagnostics.
* @returns a disposer that tears the effect down and settles once done.
*/
effect(execute: () => SyncEffect, label?: string): Disposable<Promise<void>>
effect(execute: () => Effect, label?: string): AsyncDisposable<Promise<void>>
```
@@ -24,6 +37,7 @@ Register a cleanup-aware effect on this fiber.
### ctx.fiber
```ts website-api
/** The fiber (plugin runtime instance) that owns this context. */
fiber: Fiber
```
@@ -41,6 +55,7 @@ A fiber tracks dependency state, validated config, lifecycle effects, and cleanu
### fiber.uid
```ts website-api
/** Unique id within the registry; 0 for the root fiber, `null` once disposed. */
public uid: number | null
```
@@ -51,6 +66,7 @@ Unique id within the registry; 0 for the root fiber, `null` once disposed.
### fiber.ctx
```ts website-api
/** The context this fiber's plugin runs in (extends the parent context). */
public readonly ctx: Context
```
@@ -61,6 +77,7 @@ The context this fiber's plugin runs in (extends the parent context).
### fiber.config
```ts website-api
/** The validated plugin config (updated by `update()`). */
public config: any
```
@@ -71,6 +88,7 @@ The validated plugin config (updated by `update()`).
### fiber.state
```ts website-api
/** Current lifecycle state; transitions emit `internal/status`. */
public state
```
@@ -81,6 +99,7 @@ Current lifecycle state; transitions emit `internal/status`.
### fiber.dispose
```ts website-api
/** Dispose this fiber: unload the plugin, then settle once cleanup finished. */
public readonly dispose: () => Promise<void>
```
@@ -91,6 +110,7 @@ Dispose this fiber: unload the plugin, then settle once cleanup finished.
### fiber.store
```ts website-api
/** Snapshot of required service implementations while loaded; `undefined` otherwise. */
public store: Dict<Impl> | undefined
```
@@ -101,6 +121,7 @@ Snapshot of required service implementations while loaded; `undefined` otherwise
### fiber.inertia
```ts website-api
/** The in-flight load/unload transition, if one is currently running. */
public inertia: Promise<void> | undefined
```
@@ -111,6 +132,7 @@ The in-flight load/unload transition, if one is currently running.
### fiber.name
```ts website-api
/** The plugin's display name, inherited from the nearest named ancestor, else `'root'`. */
get name()
```
@@ -121,6 +143,12 @@ The plugin's display name, inherited from the nearest named ancestor, else `'roo
### fiber.assertActive()
```ts website-api
/**
* Throw if the fiber has already been disposed.
*
* @returns nothing when the fiber is still active.
* @throws {CordisError} `INACTIVE_EFFECT` when the fiber's uid has been cleared.
*/
assertActive()
```
@@ -133,6 +161,19 @@ Throw if the fiber has already been disposed.
### fiber.effect(execute, label?)
```ts website-api
/**
* Register a cleanup-aware effect on this fiber.
*
* `execute` runs immediately; the disposers it produces are collected and
* run (in reverse order) either when the returned disposer is called or
* when the fiber unloads, whichever comes first. Calling the disposer twice
* is a no-op. Throws `CordisError('INACTIVE_EFFECT')` if the fiber is
* already disposed, and `TypeError` if `execute` returns an invalid shape.
*
* @param execute — the effect body; see {@link Effect} for accepted shapes.
* @param label — effect label shown in `getEffects()` diagnostics.
* @returns a disposer that tears the effect down and settles once done.
*/
effect(execute: () => SyncEffect, label?: string): Disposable<Promise<void>>
effect(execute: () => Effect, label?: string): AsyncDisposable<Promise<void>>
```
@@ -150,6 +191,11 @@ Register a cleanup-aware effect on this fiber.
### fiber.getEffects()
```ts website-api
/**
* Return metadata for currently registered effects.
*
* @returns one {@link EffectMeta} tree per labeled live effect.
*/
getEffects()
```
@@ -162,6 +208,12 @@ Return metadata for currently registered effects.
### fiber.await()
```ts website-api
/**
* Wait for current lifecycle work and rethrow startup errors.
*
* @returns this fiber, once it has settled into a stable state.
* @throws the config-validation or plugin-startup error, if any.
*/
async await()
```
@@ -174,6 +226,12 @@ Wait for current lifecycle work and rethrow startup errors.
### fiber.restart()
```ts website-api
/**
* Dispose and immediately reload this plugin with its current config.
*
* @returns a promise resolving once the reload settled.
* @throws {CordisError} `INACTIVE_EFFECT` when the fiber is already disposed.
*/
async restart()
```
@@ -186,6 +244,17 @@ Dispose and immediately reload this plugin with its current config.
### fiber.update(config, noSave?)
```ts website-api
/**
* Validate and apply new config, then restart the plugin.
*
* Runs the `internal/update` waterfall first, so update hooks (and HMR)
* can veto or replace the restart.
*
* @param config — the new raw config; validated before anything restarts.
* @param noSave — hint for persistence hooks not to write the change back.
* @returns nothing; the restart runs behind the `internal/update` waterfall.
* @throws {ValidationError} when the new config fails validation.
*/
update(config: any, noSave = false)
```
@@ -205,6 +274,13 @@ Effect body result accepted by `ctx.effect()` and plugin startup.
Either a single disposer, a promise of one, or a (possibly async) iterable yielding several — generator effects register each yielded disposer as it is produced.
```ts website-api
/**
* Effect body result accepted by `ctx.effect()` and plugin startup.
*
* Either a single disposer, a promise of one, or a (possibly async) iterable
* yielding several — generator effects register each yielded disposer as it
* is produced.
*/
type Effect<T = any> =
| SyncEffect<T>
| AsyncEffect<T>
@@ -218,6 +294,12 @@ Function returned by an effect to release resources during disposal.
Disposers run in reverse registration order when the owning fiber unloads; they may be async, in which case unloading awaits them.
```ts website-api
/**
* Function returned by an effect to release resources during disposal.
*
* Disposers run in reverse registration order when the owning fiber unloads;
* they may be async, in which case unloading awaits them.
*/
type Disposable<T = any> = () => T
```
@@ -228,6 +310,7 @@ type Disposable<T = any> = () => T
Tree node used to expose nested effect labels for diagnostics.
```ts website-api
/** Tree node used to expose nested effect labels for diagnostics. */
interface EffectMeta {
/** Human-readable effect label, e.g. `ctx.on("event")` or `ctx.provide("name")`. */
label: string
@@ -243,6 +326,7 @@ interface EffectMeta {
Framework error with a stable machine-readable code.
```ts website-api
/** Framework error with a stable machine-readable code. */
class CordisError extends Error {
/**
* @param code — the stable error code; also the default message.
@@ -251,6 +335,7 @@ class CordisError extends Error {
constructor(public code: CordisError.Code, message?: string)
}
/** Cordis error code definitions. */
namespace CordisError {
export type Code = keyof typeof Code
@@ -267,6 +352,7 @@ namespace CordisError {
Error raised when plugin configuration fails standard-schema validation.
```ts website-api
/** Error raised when plugin configuration fails standard-schema validation. */
class ValidationError extends TypeError {
name = 'ValidationError'
+28
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@@ -7,6 +7,16 @@ Plugin loading and dependency injection.
### ctx.inject(deps, callback)
```ts website-api
/**
* Run a callback once the requested services are available.
*
* Shorthand for `ctx.plugin({ inject, apply: callback })`: the callback
* is unloaded and re-run whenever a required service changes.
*
* @param deps — required services, as an array or a name → config map.
* @param callback — plugin body called with `(ctx, config)`.
* @returns the fiber; awaiting it settles once loading finished.
*/
inject(deps: Inject, callback: Plugin.Function<void>): Fiber & PromiseLike<Fiber>
```
@@ -23,6 +33,14 @@ Shorthand for `ctx.plugin({ inject, apply: callback })`: the callback is unloade
### ctx.plugin(plugin, ...args)
```ts website-api
/**
* Load a plugin in the current context.
*
* @param plugin — a function, class, or `{ apply }` object plugin.
* @param args — the plugin config, validated against its `Config` schema.
* @returns the fiber; awaiting it settles once loading finished
* (rejecting on config or startup errors).
*/
plugin<P extends Plugin>(plugin: P, ...args: Spread<GetPluginConfig<P>>): Fiber & PromiseLike<Fiber>
```
@@ -40,11 +58,13 @@ Load a plugin in the current context.
Supported plugin entrypoint shapes.
```ts website-api
/** Supported plugin entrypoint shapes. */
type Plugin<T = any> =
| Plugin.Function<T>
| Plugin.Constructor<T>
| Plugin.Object<T>
/** Types associated with plugin entrypoints and runtime records. */
namespace Plugin {
/** Shared metadata understood by the plugin registry and related tooling. */
export interface Base<T = any> {
@@ -104,8 +124,16 @@ Service dependency declaration accepted by plugins and the `@Inject` decorator.
Array form requests services without intercept config. Object form maps each service name to optional intercept config for the plugin context.
```ts website-api
/**
* Service dependency declaration accepted by plugins and the `@Inject`
* decorator.
*
* Array form requests services without intercept config. Object form maps each
* service name to optional intercept config for the plugin context.
*/
type Inject<M = Dict> = (keyof M)[] | { [K in keyof M]?: M[K] }
/** Utilities for normalizing plugin dependency declarations. */
namespace Inject {
/**
* Convert array/object/class-inherited inject metadata into a plain map.
+8
View File
@@ -12,6 +12,7 @@ Subclasses call `super(ctx, name)` from their constructor. The service is regist
### service.name
```ts website-api
/** The service name this instance is registered under. */
public name!: string
```
@@ -24,6 +25,7 @@ The service name this instance is registered under.
### Service.init
```ts website-api
/** Symbol key of an instance method run after construction (class plugins). */
static readonly init: unique symbol
```
@@ -34,6 +36,7 @@ Symbol key of an instance method run after construction (class plugins).
### Service.check
```ts website-api
/** Symbol key of the availability predicate passed to `ctx.provide()`. */
static readonly check: unique symbol
```
@@ -44,6 +47,7 @@ Symbol key of the availability predicate passed to `ctx.provide()`.
### Service.config
```ts website-api
/** Symbol key of the phantom intercept-config type parameter. */
static readonly config: unique symbol
```
@@ -54,6 +58,7 @@ Symbol key of the phantom intercept-config type parameter.
### Service.invoke
```ts website-api
/** Symbol key of the call body making a service callable (e.g. `ctx.logger()`). */
static readonly invoke: unique symbol
```
@@ -64,6 +69,7 @@ Symbol key of the call body making a service callable (e.g. `ctx.logger()`).
### Service.extend
```ts website-api
/** Symbol key of the helper deriving an extended service instance. */
static readonly extend: unique symbol
```
@@ -74,6 +80,7 @@ Symbol key of the helper deriving an extended service instance.
### Service.tracker
```ts website-api
/** Symbol key of the tracker metadata used for context tracing. */
static readonly tracker: unique symbol
```
@@ -84,6 +91,7 @@ Symbol key of the tracker metadata used for context tracing.
### Service.resolveConfig
```ts website-api
/** Symbol key of the intercept-config resolution helper below. */
static readonly resolveConfig: unique symbol
```