Add typescript declaration

Author: vincekovacs

package.json

@@ -55,5 +55,6 @@
       "before",
       "after"
     ]
-  }
+  },
+  "types": "types/index.d.ts"
 }

types/index.d.ts

@@ -0,0 +1,58 @@
+declare namespace SimpleKeystore {
+    class KeystoreError extends Error {
+        constructor(message: string);
+    }
+
+    class PrivateKeyNotFoundError extends KeystoreError {
+        constructor(keyId: string);
+    }
+
+    class CertificateNotFoundError extends KeystoreError {
+        constructor(keyId: string);
+    }
+
+    interface PrivateKey {
+        alg: string;
+        key: string;
+        passphrase: string;
+    }
+
+    interface Certificate {
+        alg: string;
+        cert: string;
+    }
+
+    interface JWK {
+        // Key id
+        kid: string;
+
+        // X.509 certificate chain
+        x5c: string;
+    }
+
+    interface Keystore {
+        KeystoreError: new (message: string) => KeystoreError;
+
+        PrivateKeyNotFoundError: new (keyId: string) => PrivateKeyNotFoundError;
+
+        CertificateNotFoundError: new (keyId: string) => CertificateNotFoundError;
+
+        getCurrentSigningKeyId(): void;
+
+        getPrivateKey(id: string): Promise<PrivateKey>;
+
+        getCertificate(id: string): Promise<Certificate>;
+
+        getAllCertificatesAsJWKS(): JWK[]
+    }
+
+    type KeyPassphrasse = string
+
+    type KeyPassphrasseCollection = {
+        [key: string]: KeyPassphrasse
+    }
+}
+
+declare function SimpleKeystore(debugNamePrefix: string, baseDir: string, refreshIntervalMillis: number, signingKeyPassphrases: SimpleKeystore.KeyPassphrasseCollection): SimpleKeystore.Keystore;
+
+export = SimpleKeystore;