xstate@4.37.0

Minor Changes

• #3835 431472082 Thanks @with-heart! - The new TagsFrom helper type extracts the type of tags from a state machine when typegen is enabled:

  const machine = createMachine({
    // `tags` attached to machine via typegen
    tsTypes: {} as import('./machine.typegen').Typegen0,
    tags: ['a', 'b'],
    states: {
      idle: { tags: 'c' }
    }
  });
  
  type Tags = TagsFrom<typeof machine>; // 'a' | 'b' | 'c'

  If typegen is not enabled, TagsFrom returns string:

  const machine = createMachine({
    tags: ['a', 'b'],
    states: {
      idle: { tags: 'c' }
    }
  });
  
  type Tags = TagsFrom<typeof machine>; // string

Patch Changes

• #3855 02012c2be Thanks @Andarist! - Fixed event type narrowing in some of the builtin actions.