multipleEffectProvide

Warns against chaining Effect.provide calls which can cause service lifecycle issues

Property	Value
Category	Anti-pattern
Default severity	warning
Fixable	Yes
Effect versions	v3, v4
Diagnostic codes	TS377033
Language Service name	multipleEffectProvide
Oxlint name	effecttsgo/multiple-effect-provide

Preview

import { Effect, Layer, Context } from "effect"

class A extends Context.Service<A>()("A", { make: Effect.succeed({}) }) {
  static Default = Layer.effect(this, this.make)
}
class B extends Context.Service<B>()("B", { make: Effect.succeed({}) }) {
  static Default = Layer.effect(this, this.make)
}
export const preview = Effect.void.pipe(Effect.provide(A.Default), Effect.provide(B.Default))
/**
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^ effecttsgo(multiple-effect-provide): This expression chains multiple `Effect.provide` calls. Providing Layers in multiple calls in a chain can break service lifecycle behavior compared with a single combined provide with merged layers.
*/

Language Service Configuration

See the Language Service setup guide for installation instructions.

{
  "$schema": "./node_modules/@effect/tsgo/schema.json",
  "compilerOptions": {
    "plugins": [
      {
        "name": "@effect/language-service",
        "diagnosticSeverity": {
          "multipleEffectProvide": "warning"
        }
      }
    ]
  }
}

Oxlint Configuration

See the Oxlint setup guide for installation and patching instructions.

{
  "$schema": "./node_modules/@effect/tsgo/oxlint-schema.json",
  "options": {
    "typeAware": true
  },
  "plugins": ["effecttsgo"],
  "rules": {
    "effecttsgo/multiple-effect-provide": "warn"
  }
}