[core] Add `meta` types

statelyai / xstate

Actor-based state management & orchestration for complex app logic.

https://stately.ai/docs

MIT License

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[core] Add `meta` types #4863

Closed davidkpiano closed 5 months ago

davidkpiano commented 5 months ago

Meta objects for state nodes and transitions can now be specified in setup({ types: … }):

const machine = setup({
  types: {
    meta: {} as {
      layout: string;
    }
  }
}).createMachine({
  initial: 'home',
  states: {
    home: {
      meta: {
        layout: 'full' // strongly typed
      }
    }
  }
});

const actor = createActor(machine).start();

actor.getSnapshot().getMeta().home!;
// typed as { layout: string }

Fixes #809