feat(identity): export point and signature types (#886)

* feat(identity): export point and signature types

re #885

* docs(identity): add the generate commitment function to the readme file

packages/identity/README.md

@@ -129,3 +129,11 @@ const signature = identity.signMessage(message)
 
 Identity.verifySignature(message, signature, identity.publicKey)
 ```
+
+\# **Identity.generateCommitment**(publicKey: _Point_): _bigint_
+
+```typescript
+import { Identity } from "@semaphore-protocol/identity"
+
+Identity.generateCommitment(identity.publicKey)
+```

packages/identity/src/index.ts

@@ -1,10 +1,13 @@
 import type { Point } from "@zk-kit/baby-jubjub"
-import { EdDSAPoseidon, Signature, signMessage, verifySignature } from "@zk-kit/eddsa-poseidon"
+import { EdDSAPoseidon, type Signature, signMessage, verifySignature } from "@zk-kit/eddsa-poseidon"
 import type { BigNumberish } from "@zk-kit/utils"
 import { base64ToBuffer, bufferToBase64, textToBase64 } from "@zk-kit/utils/conversions"
 import { isString } from "@zk-kit/utils/type-checks"
 import { poseidon2 } from "poseidon-lite/poseidon2"
 
+export type { Point }
+export type { Signature }
+
 /**
  * The Semaphore identity is essentially an {@link https://www.rfc-editor.org/rfc/rfc8032 | EdDSA}
  * public/private key pair. The {@link https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/eddsa-poseidon | EdDSA implementation}