Add event types

[pakrym-stripe]

Renames the current Event type to EventBase. Adds generated event definitions for known events with correct data.object reference type.

Defines a new Event type that's a union of all strongly-typed events. The Event union is equivalent in structure to the old Event type except the type property that becomes an enum of all known even types and not just a string.

const event = await stripe.webhooks.constructEventAsync(body, signature, secret);

// Allows narrowing of event type
if (event.type == 'customer.created') {
  const customer = event.data.object; // customer is typed as Stripe.Customer
  console.log(customer.email); // No error, typed property access
}

// TypeScript error
// This comparison appears to be unintentional because the types "account.application.authorized" | ... and  "customer.crated"  have no overlap.
if (event.type == 'customer.crated') {}

[anniel-stripe]

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