fix: export with try catch

packages/siwe/lib/ethersCompat.ts

@@ -1,47 +1,53 @@
-import ethers from 'ethers';
-
 type Ethers6BigNumberish = string | number | bigint;
 
 // NB: This compatibility type omits the `Signature` class defined in ethers v6;
 // however, a `Signature` instance is compatible with the object type defined.
 type Ethers6SignatureLike =
   | string
   | {
-    r: string;
-    s: string;
-    v: Ethers6BigNumberish;
-    yParity?: 0 | 1;
-    yParityAndS?: string;
-  }
+      r: string;
+      s: string;
+      v: Ethers6BigNumberish;
+      yParity?: 0 | 1;
+      yParityAndS?: string;
+    }
   | {
-    r: string;
-    yParityAndS: string;
-    yParity?: 0 | 1;
-    s?: string;
-    v?: number;
-  }
+      r: string;
+      yParityAndS: string;
+      yParity?: 0 | 1;
+      s?: string;
+      v?: number;
+    }
   | {
-    r: string;
-    s: string;
-    yParity: 0 | 1;
-    v?: Ethers6BigNumberish;
-    yParityAndS?: string;
-  };
+      r: string;
+      s: string;
+      yParity: 0 | 1;
+      v?: Ethers6BigNumberish;
+      yParityAndS?: string;
+    };
+
+let ethersVerifyMessage = null;
+let ethersHashMessage = null;
+let ethersGetAddress = null;
 
-export const verifyMessage =
-  // @ts-expect-error -- ethers v6 compatibility hack
-  ethers?.utils.verifyMessage ??
-  (ethers?.verifyMessage as (
+try {
+  const { utils } = require('ethers');
+  ethersVerifyMessage = utils.verifyMessage;
+  ethersHashMessage = utils.hashMessage;
+  ethersGetAddress = utils.getAddress;
+} catch (error) {
+  const { verifyMessage, getAddress, hashMessage } = require('ethers');
+
+  ethersVerifyMessage = verifyMessage as (
     message: Uint8Array | string,
     sig: Ethers6SignatureLike
-  ) => string);
+  ) => string;
+
+  ethersHashMessage = hashMessage as (message: Uint8Array | string) => string;
 
-export const hashMessage =
-  // @ts-expect-error -- ethers v6 compatibility hack
-  ethers.utils?.hashMessage ??
-  (ethers?.hashMessage as (message: Uint8Array | string) => string);
+  ethersGetAddress = getAddress as (address: string) => string;
+}
 
-export const getAddress =
-  // @ts-expect-error -- ethers v6 compatibility hack
-  ethers.utils?.getAddress ??
-  (ethers?.getAddress as (address: string) => string);
+export const verifyMessage = ethersVerifyMessage;
+export const hashMessage = ethersHashMessage;
+export const getAddress = ethersGetAddress;