diff --git a/types.d.ts b/types.d.ts
index 6103f73..cec8606 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -229,12 +229,4 @@ export interface IFlagsmith<F extends string = string, T extends string = string
     environmentID: string | null
 }
 
-export function isTraitConfig(trait: ITraitConfig | IFlagsmithTrait): trait is ITraitConfig {
-    return typeof trait == 'object' && trait.value !== undefined;
-}
-
-export function isIdentityConfig(identity: IIdentityConfig | string): identity is IIdentityConfig {
-    return typeof(identity == 'object') && identity.identity !== undefined;
-}
-
 export {};
diff --git a/types.ts b/types.ts
new file mode 100644
index 0000000..ad6d7c1
--- /dev/null
+++ b/types.ts
@@ -0,0 +1,11 @@
+import { IIdentityConfig } from "./types.d";
+import { IFlagsmithTrait } from "./types.d";
+import { ITraitConfig } from "./types.d";
+
+export function isTraitConfig(trait: ITraitConfig | IFlagsmithTrait): trait is ITraitConfig {
+    return typeof trait == 'object' && trait.value !== undefined;
+}
+
+export function isIdentityConfig(identity: IIdentityConfig | string): identity is IIdentityConfig {
+    return typeof(identity == 'object') && identity.identifier !== undefined;
+}