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Minor Changes

• #4145 5cc902531 Thanks @davidkpiano! - Significant improvements to error handling have been made:

  • Actors will no longer crash when an error is thrown in an observer (actor.subscribe(observer)).
  • Errors will be handled by observer's .error() handler:

    actor.subscribe({
      error: (error) => {
        // handle error
      }
    });

  • If an observer does not have an error handler, the error will be thrown in a clear stack so bug tracking services can collect it.

• #4054 a24711181 Thanks @davidkpiano! - Input types can now be specified for machines:

  const emailMachine = createMachine({
    types: {} as {
      input: {
        subject: string;
        message: string;
      };
    },
    context: ({ input }) => ({
      // Strongly-typed input!
      emailSubject: input.subject,
      emailBody: input.message.trim()
    })
  });
  
  const emailActor = interpret(emailMachine, {
    input: {
      // Strongly-typed input!
      subject: 'Hello, world!',
      message: 'This is a test.'
    }
  }).start();