@State / @Transition

Finite state machine — guard methods with allowed transitions; illegal moves throw at runtime.


Kind	Runtime
Backends	`legacy`, `stage3`
Requires `generate`	No

Example

ts

import { State, Transition } from 'lombok-typescript/legacy';

@State({ states: ['draft', 'done'], initial: 'draft' })
class Task {
  @Transition({ from: 'draft', to: 'done' })
  complete() {}

  @Transition({ from: ['draft', 'done'], to: 'archived' })
  archive() {}
}

const task = new Task();
task.state; // 'draft'
task.complete();
task.state; // 'done'

Optional hooks: onEnter, onExit, onTransition in @State({ ... }).

Caveats

Invalid transitions throw Error at runtime (not compile-time).
Combining with NestJS request-scoped providers can surprise you if state is shared.