effect-io-ai

Package: effect
Module: Context

Context.merge

Merges two Contexts into one.

When to use

Use when you need to combine two contexts.

Details

When both contexts contain the same service key, the service from that overrides the service from self.

Example (Merging two contexts)

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

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

const firstContext = Context.make(Port, { PORT: 8080 })
const secondContext = Context.make(Timeout, { TIMEOUT: 5000 })

const context = Context.merge(firstContext, secondContext)

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

See

• mergeAll for merging more than two contexts at once

Signature

declare const merge: { <R1>(that: Context<R1>): <Services>(self: Context<Services>) => Context<R1 | Services>; <Services, R1>(self: Context<Services>, that: Context<R1>): Context<Services | R1>; }

Source

Since v2.0.0