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# Context

The context is the core cordis object: every service, event, and lifecycle API is reached through `ctx`. Event methods (`ctx.on`, `ctx.emit`, …) are documented on [Events](./events.md); `ctx.effect` and `ctx.fiber` on [Fiber](./fiber.md); `ctx.plugin` and `ctx.inject` on [Registry](./registry.md).

Root and child dependency containers for Cordis plugins.
A context is a proxy: normal property reads go through the service resolver, while `extend()`, `isolate()`, and `intercept()` create scoped child contexts without mutating their parent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L42)

### ctx.extend(meta?)

```ts website-api
extend(meta = {}): this
```

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.

- `meta` — own properties (including symbol keys) to define on the child.

**Returns** a child context inheriting from this one.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L99)

### ctx.isolate(name, label?)

```ts website-api
isolate(name: string, label?: symbol)
```

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.

- `name` — the service name to isolate.
- `label` — scope label to join; defaults to a fresh unique symbol.

**Returns** a child context whose `name` service resolves in the new scope.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L121)

### ctx.intercept(name, config)

```ts website-api
intercept<K extends InjectKey>(name: K, config: Context[K] extends { [symbols.config]: infer T } ? T : never): this
intercept(name: string, config: any): this
```

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.

- `name` — the service name whose config to intercept.
- `config` — the intercept config to merge for that service.

**Returns** a child context carrying the additional intercept entry.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L139)

### ctx.root

```ts website-api
root: this
```

The root context of the application (every child context shares it). @experimental

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L22)

### ctx.baseUrl

```ts website-api
baseUrl?: string
```

Base URL used to resolve relative plugin/module specifiers, if the runtime sets one.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L24)

### ctx.events

```ts website-api
events: EventsService
```

The event bus. Its methods are also mixed onto `ctx` (`ctx.on`, `ctx.emit`, ...).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L26)

### ctx.logger

```ts website-api
logger: LoggerService
```

The logging service. Call `ctx.logger(name)` for a named logger.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L28)

### ctx.reflect

```ts website-api
reflect: ReflectService
```

The reflection layer backing the context proxy (`ctx.get`, `ctx.provide`, ...).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L30)

### ctx.registry

```ts website-api
registry: RegistryService
```

The plugin registry. Its methods are mixed onto `ctx` (`ctx.plugin`, `ctx.inject`).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L32)

## Static members

### Context.effect

```ts website-api
static readonly effect: unique symbol
```

Symbol key under which a disposer exposes its EffectMeta diagnostics tree.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L44)

### Context.filter

```ts website-api
static readonly filter: unique symbol
```

Symbol key for a context's listener filter, consulted on every event dispatch.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L46)

### Context.isolate

```ts website-api
static readonly isolate: unique symbol
```

Symbol key of the isolation map (see the `Context[symbols.isolate]` property).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L48)

### Context.intercept

```ts website-api
static readonly intercept: unique symbol
```

Symbol key of the intercept map (see the `Context[symbols.intercept]` property).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L50)

### Context.is(value)

```ts website-api
static is(value: any): value is Context
```

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`.

- `value` — the value to test.

**Returns** `true` if `value` is a Cordis context, narrowing its type.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L61)

## Service store and mixins

### ctx.get(name, strict?)

```ts website-api
get<K extends string & keyof this>(name: K, strict?: boolean): undefined | this[K]
get(name: string, strict?: boolean): any
```

Read a service from the store without the inject requirement.

- `name` — the service name.
- `strict` — when `true` (default), only return implementations whose providing fiber is currently active.

**Returns** the service value, or `undefined` when not (yet) provided.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/reflect.ts#L16)

### ctx.set(name, value)

```ts website-api
set<K extends string & keyof this>(name: K, value: undefined | this[K]): void
set(name: string, value: any): void
```

Overwrite a provided service's value.
Only the fiber that provided the service may set it; setting an unprovided name throws.

- `name` — the service name.
- `value` — the new service value.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/reflect.ts#L28)

### ctx.provide(name, value)

```ts website-api
provide<K extends string & keyof this>(name: K, value: undefined | this[K]): () => void
provide(name: string, value?: any): () => void
```

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.

- `name` — the service name.
- `value` — the service value.

**Returns** a disposer that unregisters the service.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/reflect.ts#L43)

### ctx.accessor(name, options)

```ts website-api
accessor(name: string, options: Omit<Property.Accessor, 'type'>): void
```

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.

- `name` — the context property name.
- `options` — the `get` hook and optional `set` hook.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/reflect.ts#L55)

### ctx.mixin(name, mixins)

```ts website-api
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
```

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.

- `name` — the context property holding the source service.
- `mixins` — keys to forward, or a source-key → ctx-key map.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/reflect.ts#L66)