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Releases

@effect/language-service@0.62.0

Minor Changes

• #528 7dc14cf Thanks @mattiamanzati! - Add typeToSchema codegen

  This adds a new // @effect-codegens typeToSchema codegen that automatically generates Effect Schema classes from TypeScript types. Given a type alias with object members representing schemas to generate (e.g., type ToGenerate = { UserSchema: User, TodoSchema: Todo }), the codegen will create the corresponding Schema class definitions.

  The generated schemas:

  • Automatically detect and reuse existing schema definitions in the file
  • Support both type aliases and interfaces
  • Include outdated detection to warn when the source type changes
  • Work with the outdatedEffectCodegen diagnostic to provide automatic fix actions

  Example usage:

  type User = {
    id: number;
    name: string;
  };
  
  // @effect-codegens typeToSchema
  export type ToGenerate = {
    UserSchema: User;
  };
  
  // Generated by the codegen:
  export class UserSchema extends Schema.Class<UserSchema>("UserSchema")({
    id: Schema.Number,
    name: Schema.String,
  }) {}

Patch Changes

• #530 5ecdc62 Thanks @mattiamanzati! - Fix Refactor to Schema (Recursive Structural) to support exactOptionalPropertyTypes

  When exactOptionalPropertyTypes is enabled in tsconfig, optional properties with types like string | undefined are not assignable to types defined as prop?: string. This fix generates Schema.optionalWith(Schema.String, { exact: true }) instead of Schema.optional(Schema.Union(Schema.Undefined, Schema.String)) to maintain type compatibility with external libraries that don't always include undefined in their optional property types.

  Example:

  // With exactOptionalPropertyTypes enabled
  type User = {
    name?: string; // External library type (e.g., Stripe API)
  };
  
  // Generated schema now uses:
  Schema.optionalWith(Schema.String, { exact: true });
  
  // Instead of:
  Schema.optional(Schema.Union(Schema.Undefined, Schema.String));

  This ensures the generated schema maintains proper type compatibility with external libraries when using strict TypeScript configurations.