missing-layer-context.md

missingLayerContext

Detects Layer values with unhandled context requirements

Property	Value
Category	Correctness
Default severity	error
Fixable	No
Effect versions	v3, v4
Diagnostic codes	TS377034
Language Service name	missingLayerContext
Oxlint name	effecttsgo/missing-layer-context

Preview

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

class A extends Context.Service<A>()("A", { make: Effect.succeed({}) }) {
  static Default = Layer.effect(this, this.make)
}
declare const layer: Layer.Layer<A, never, A>
// @ts-expect-error
export const preview: Layer.Layer<A> = layer
/**
             ^^^^^^^ effecttsgo(missing-layer-context): Missing 'A' in the expected Layer context.
*/

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": {
          "missingLayerContext": "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/missing-layer-context": "warn"
  }
}