preferTypedSchemaDecoder

Suggests typed Schema decoders when the input is assignable to the schema's Encoded type

Property	Value
Category	Style
Default severity	suggestion
Fixable	Yes
Effect versions	v4
Diagnostic codes	TS377112
Language Service name	preferTypedSchemaDecoder
Oxlint name	effecttsgo/prefer-typed-schema-decoder

Preview

import { Schema } from "effect"

const Person = Schema.Struct({ name: Schema.String })

export const person = Schema.decodeUnknownSync(Person)({ name: "Ada" })
/**
                             ^^^^^^^^^^^^^^^^^ effecttsgo(prefer-typed-schema-decoder): This input is already assignable to the schema's Encoded type. Use `decodeSync` to preserve compile-time type checking instead of discarding the input type through `decodeUnknownSync`.
*/

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": {
          "preferTypedSchemaDecoder": "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/prefer-typed-schema-decoder": "warn"
  }
}