effect-io-ai

Package: effect
Module: Context

Context.add

Adds a service to a given Context.

When to use

Use when you need to store a known service value in a Context.

Details

If the context already contains the same service key, the new service replaces the previous one.

Example (Adding a service to a context)

import { Context, pipe } from "effect"
import * as assert from "node:assert"

const Port = Context.Service<{ PORT: number }>("Port")
const Timeout = Context.Service<{ TIMEOUT: number }>("Timeout")

const someContext = Context.make(Port, { PORT: 8080 })

const context = pipe(
  someContext,
  Context.add(Timeout, { TIMEOUT: 5000 })
)

assert.deepStrictEqual(Context.get(context, Port), { PORT: 8080 })
assert.deepStrictEqual(Context.get(context, Timeout), { TIMEOUT: 5000 })

See

• addOrOmit for adding or removing a service from an Option

Signature

declare const add: { <I, S>(key: Key<I, S>, service: Types.NoInfer<S>): <Services>(self: Context<Services>) => Context<Services | I>; <Services, I, S>(self: Context<Services>, key: Key<I, S>, service: Types.NoInfer<S>): Context<Services | I>; }

Source

Since v2.0.0