diff --git a/lib/shared/updates/bad-device-token-spec.js b/lib/shared/updates/bad-device-token-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/bad-device-token-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const badDeviceTokenSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/delete-account-spec.js b/lib/shared/updates/delete-account-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/delete-account-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const deleteAccountSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/delete-thread-spec.js b/lib/shared/updates/delete-thread-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/delete-thread-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const deleteThreadSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/join-thread-spec.js b/lib/shared/updates/join-thread-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/join-thread-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const joinThreadSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/update-current-user-spec.js b/lib/shared/updates/update-current-user-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-current-user-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const updateCurrentUserSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/update-entry-spec.js b/lib/shared/updates/update-entry-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-entry-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const updateEntrySpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/update-spec.js b/lib/shared/updates/update-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-spec.js
@@ -0,0 +1,3 @@
+// @flow
+
+export type UpdateSpec = {};
diff --git a/lib/shared/updates/update-specs.js b/lib/shared/updates/update-specs.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-specs.js
@@ -0,0 +1,27 @@
+// @flow
+
+import { badDeviceTokenSpec } from './bad-device-token-spec.js';
+import { deleteAccountSpec } from './delete-account-spec.js';
+import { deleteThreadSpec } from './delete-thread-spec.js';
+import { joinThreadSpec } from './join-thread-spec.js';
+import { updateCurrentUserSpec } from './update-current-user-spec.js';
+import { updateEntrySpec } from './update-entry-spec.js';
+import type { UpdateSpec } from './update-spec.js';
+import { updateThreadReadStatusSpec } from './update-thread-read-status-spec.js';
+import { updateThreadSpec } from './update-thread-spec.js';
+import { updateUserSpec } from './update-user-spec.js';
+import { updateTypes, type UpdateType } from '../../types/update-types-enum.js';
+
+export const updateSpecs: {
+  +[UpdateType]: UpdateSpec,
+} = Object.freeze({
+  [updateTypes.DELETE_ACCOUNT]: deleteAccountSpec,
+  [updateTypes.UPDATE_THREAD]: updateThreadSpec,
+  [updateTypes.UPDATE_THREAD_READ_STATUS]: updateThreadReadStatusSpec,
+  [updateTypes.DELETE_THREAD]: deleteThreadSpec,
+  [updateTypes.JOIN_THREAD]: joinThreadSpec,
+  [updateTypes.BAD_DEVICE_TOKEN]: badDeviceTokenSpec,
+  [updateTypes.UPDATE_ENTRY]: updateEntrySpec,
+  [updateTypes.UPDATE_CURRENT_USER]: updateCurrentUserSpec,
+  [updateTypes.UPDATE_USER]: updateUserSpec,
+});
diff --git a/lib/shared/updates/update-thread-read-status-spec.js b/lib/shared/updates/update-thread-read-status-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-thread-read-status-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const updateThreadReadStatusSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/update-thread-spec.js b/lib/shared/updates/update-thread-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-thread-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const updateThreadSpec: UpdateSpec = Object.freeze({});
diff --git a/lib/shared/updates/update-user-spec.js b/lib/shared/updates/update-user-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/updates/update-user-spec.js
@@ -0,0 +1,5 @@
+// @flow
+
+import type { UpdateSpec } from './update-spec.js';
+
+export const updateUserSpec: UpdateSpec = Object.freeze({});