Function mapHandler

packages/effect/src/unstable/cli/Command.ts:1376–1382

(
  self: Command<Name, Input, ContextInput, E, R>,
  f: (handler: Effect.Effect<void, E | CliError.CliError, R | Environment>, input: Input) => Effect.Effect<void, E2, R2>
)

// Internal helper: transforms a command's handler while preserving other properties
const mapHandler = <Name extends string, Input, E, R, ContextInput, E2, R2>(
  self: Command<Name, Input, ContextInput, E, R>,
  f: (handler: Effect.Effect<void, E | CliError.CliError, R | Environment>, input: Input) => Effect.Effect<void, E2, R2>
): Command<Name, Input, ContextInput, E2, R2> => {
  const impl = toImpl(self)
  return makeCommand({ ...impl, handle: (input, path) => f(impl.handle(input, path), input) })
}

/**
 * Provides the handler of a command with the services produced by a layer