Add base class containing migrated pegin logic

Author: lserra-iov

package.json

@@ -24,5 +24,10 @@
     "tsup": "^8.3.6",
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.24.0"
+  },
+  "dependencies": {
+    "@rsksmart/rsk-precompiled-abis": "6.0.0-ARROWHEAD",
+    "bitcoinjs-lib": "^6.1.7",
+    "ethers": "^6.13.5"
   }
 }

pnpm-lock.yaml

@@ -0,0 +1,21 @@
+import { bridge } from '@rsksmart/rsk-precompiled-abis'
+import { ethers } from 'ethers'
+import type { Network } from './types'
+
+export class Bridge {
+  provider: ethers.JsonRpcProvider
+  bridgeContract: ethers.Contract
+  publicNodes: Record<Network, string> = {
+    mainnet: 'https://public-node.rsk.co',
+    testnet: 'https://public-node.testnet.rsk.co',
+  }
+
+  constructor(network: Network, rpcProviderUrl?: string) {
+    this.provider = new ethers.JsonRpcProvider(rpcProviderUrl ?? this.publicNodes[network])
+    this.bridgeContract = new ethers.Contract(bridge.address, bridge.abi, this.provider)
+  }
+
+  async getFederationAddress(): Promise<string> {
+    return this.bridgeContract.getFederationAddress?.()
+  }
+}

src/bridge.ts

@@ -0,0 +1,13 @@
+export class AmountBelowMinError extends Error {
+  constructor(message?: string) {
+    super(message)
+    this.name = 'AmountBelowMinError'
+  }
+}
+
+export class NotEnoughFundsError extends Error {
+  constructor(message?: string) {
+    super(message)
+    this.name = 'NotEnoughFundsError'
+  }
+}

src/errors.ts

@@ -0,0 +1,2 @@
+export { PowPegSDK } from './sdk/powpeg'
+export * from './types'