diff --git a/src/server/webhooks/events/event.ts b/src/server/webhooks/events/event.ts
index e015af3..fe37d8e 100644
--- a/src/server/webhooks/events/event.ts
+++ b/src/server/webhooks/events/event.ts
@@ -1,6 +1,6 @@
-import type { PrEvent } from "./pr/event.js"
-import type { ProjectEvent } from "./project/event.js"
-import type { RepoEvent } from "./repo/event.js"
+import { prEventKeys, type PrEvent } from "./pr/event.js"
+import { projectEventKeys, type ProjectEvent } from "./project/event.js"
+import { repoEventKeys, type RepoEvent } from "./repo/event.js"
 
 /**
  * When you have a webhook with an event, Bitbucket Data Center sends the event
@@ -17,8 +17,16 @@ import type { RepoEvent } from "./repo/event.js"
  * event's user.
  */
 export type Event = PrEvent | ProjectEvent | RepoEvent
+export type EventKey = Event["eventKey"]
 
-export type EventKey =
-	| PrEvent["eventKey"]
-	| ProjectEvent["eventKey"]
-	| RepoEvent["eventKey"]
+export function isEventKey(key: unknown): key is EventKey {
+	return Object.values<unknown>(eventKeys).includes(key)
+}
+
+const eventKeys = {
+	...prEventKeys,
+	...projectEventKeys,
+	...repoEventKeys,
+} as const
+
+eventKeys satisfies Record<EventKey, EventKey>
diff --git a/src/server/webhooks/events/pr/event.test.ts b/src/server/webhooks/events/pr/event.test.ts
new file mode 100644
index 0000000..e2c544b
--- /dev/null
+++ b/src/server/webhooks/events/pr/event.test.ts
@@ -0,0 +1,7 @@
+import { test } from "vitest"
+import { isPrEventKey } from "./event.js"
+
+test("isPrEventKey", ({ expect }) => {
+	const result = isPrEventKey("pr:comment:added")
+	expect(result).toBe(true)
+})
diff --git a/src/server/webhooks/events/pr/event.ts b/src/server/webhooks/events/pr/event.ts
index caee61f..f5fbe51 100644
--- a/src/server/webhooks/events/pr/event.ts
+++ b/src/server/webhooks/events/pr/event.ts
@@ -27,18 +27,26 @@ export type PrEvent =
 	| PRReviewerChangesRequested
 	| PRReviewerUnapproved
 	| PRReviewerUpdated
+export type PrEventKey = PrEvent["eventKey"]
 
-export type PrEventKey =
-	| PRCommentAdded["eventKey"]
-	| PRCommentDeleted["eventKey"]
-	| PRCommentEdited["eventKey"]
-	| PRDeclined["eventKey"]
-	| PRDeleted["eventKey"]
-	| PRFromRefUpdated["eventKey"]
-	| PRMerged["eventKey"]
-	| PRModified["eventKey"]
-	| PROpened["eventKey"]
-	| PRReviewerApproved["eventKey"]
-	| PRReviewerChangesRequested["eventKey"]
-	| PRReviewerUnapproved["eventKey"]
-	| PRReviewerUpdated["eventKey"]
+export function isPrEventKey(key: unknown): key is PrEventKey {
+	return Object.values<unknown>(prEventKeys).includes(key)
+}
+
+export const prEventKeys = {
+	"pr:comment:added": "pr:comment:added",
+	"pr:comment:deleted": "pr:comment:deleted",
+	"pr:comment:edited": "pr:comment:edited",
+	"pr:declined": "pr:declined",
+	"pr:deleted": "pr:deleted",
+	"pr:from_ref_updated": "pr:from_ref_updated",
+	"pr:merged": "pr:merged",
+	"pr:modified": "pr:modified",
+	"pr:opened": "pr:opened",
+	"pr:reviewer:approved": "pr:reviewer:approved",
+	"pr:reviewer:changes_requested": "pr:reviewer:changes_requested",
+	"pr:reviewer:unapproved": "pr:reviewer:unapproved",
+	"pr:reviewer:updated": "pr:reviewer:updated",
+} as const
+
+prEventKeys satisfies Record<PrEventKey, PrEventKey>
diff --git a/src/server/webhooks/events/project/event.test.ts b/src/server/webhooks/events/project/event.test.ts
new file mode 100644
index 0000000..866cf2e
--- /dev/null
+++ b/src/server/webhooks/events/project/event.test.ts
@@ -0,0 +1,7 @@
+import { test } from "vitest"
+import { isProjectEventKey } from "./event.js"
+
+test("isProjectEventKey", ({ expect }) => {
+	const result = isProjectEventKey("project:modified")
+	expect(result).toBe(true)
+})
diff --git a/src/server/webhooks/events/project/event.ts b/src/server/webhooks/events/project/event.ts
index 797c216..3c1ab9f 100644
--- a/src/server/webhooks/events/project/event.ts
+++ b/src/server/webhooks/events/project/event.ts
@@ -2,4 +2,14 @@ import type { ProjectModified } from "./modified.js"
 
 /** You can create webhooks for events that occur in a project. */
 export type ProjectEvent = ProjectModified
-export type ProjectEventKey = ProjectModified["eventKey"]
+export type ProjectEventKey = ProjectEvent["eventKey"]
+
+export function isProjectEventKey(key: unknown): key is ProjectEventKey {
+	return Object.values<unknown>(projectEventKeys).includes(key)
+}
+
+export const projectEventKeys = {
+	"project:modified": "project:modified",
+} as const
+
+projectEventKeys satisfies Record<ProjectEventKey, ProjectEventKey>
diff --git a/src/server/webhooks/events/repo/event.test.ts b/src/server/webhooks/events/repo/event.test.ts
new file mode 100644
index 0000000..f5663bc
--- /dev/null
+++ b/src/server/webhooks/events/repo/event.test.ts
@@ -0,0 +1,7 @@
+import { test } from "vitest"
+import { isRepoEventKey } from "./event.js"
+
+test("isRepoEventKey", ({ expect }) => {
+	const result = isRepoEventKey("mirror:repo_synchronized")
+	expect(result).toBe(true)
+})
diff --git a/src/server/webhooks/events/repo/event.ts b/src/server/webhooks/events/repo/event.ts
index 7880585..a102c8a 100644
--- a/src/server/webhooks/events/repo/event.ts
+++ b/src/server/webhooks/events/repo/event.ts
@@ -17,12 +17,21 @@ export type RepoEvent =
 	| RepoModified
 	| RepoRefsChanged
 	| RepoSecretDetected
-export type RepoEventKey =
-	| MirrorRepoSynchronized["eventKey"]
-	| RepoCommentAdded["eventKey"]
-	| RepoCommentDeleted["eventKey"]
-	| RepoCommentEdited["eventKey"]
-	| RepoForked["eventKey"]
-	| RepoModified["eventKey"]
-	| RepoRefsChanged["eventKey"]
-	| RepoSecretDetected["eventKey"]
+export type RepoEventKey = RepoEvent["eventKey"]
+
+export function isRepoEventKey(key: unknown): key is RepoEventKey {
+	return Object.values<unknown>(repoEventKeys).includes(key)
+}
+
+export const repoEventKeys = {
+	"mirror:repo_synchronized": "mirror:repo_synchronized",
+	"repo:comment:added": "repo:comment:added",
+	"repo:comment:deleted": "repo:comment:deleted",
+	"repo:comment:edited": "repo:comment:edited",
+	"repo:forked": "repo:forked",
+	"repo:modified": "repo:modified",
+	"repo:refs_changed": "repo:refs_changed",
+	"repo:secret_detected": "repo:secret_detected",
+} as const
+
+repoEventKeys satisfies Record<RepoEventKey, RepoEventKey>