"type" discriminator field.
type InitiatorLink = { identifier: string; title: string | null; type: "linear"; url: string | null } | { identifier: string; title: string | null; type: "jira"; url: string | null } | { channelName: string | null; firstMessage: string | null; threadUrl: string | null; type: "slack" } | { automationId: string; name: string | null; type: "automation"; url: string | null } | { name: string | null; scheduleId: string; type: "schedule"; url: string | null }