new module for ledger related utils

.changeset/silver-bugs-itch.md

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+---
+'@sei-js/ledger': minor
+---
+
+Packge init + helper functions to work with Ledger in Cosmos Stargate client

packages/ledger/.eslintignore

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+node_modules
+dist

packages/ledger/.npmignore

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+src
+node_modules
+docs
+coverage/
+
+.gitkeep
+jest.config.ts
+tsconfig.json
+
+yarn-error.log
+
+.eslintignore
+eslintrc.json

packages/ledger/README.md

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+# @sei-js/ledger
+
+## Installation
+```bash
+yarn add @sei-js/ledger
+```
+
+## Usage
+```typescript
+import {
+  coins,
+  SigningStargateClient,
+  StdFee
+} from "@cosmjs/stargate";
+
+import {
+  createTransportAndApp,
+  getAddresses,
+  LedgerOfflineAminoSigner
+} from "@sei-js/ledger";
+
+const testApp = async () => {
+  const validatorAddress = "seivaloper1sq7x0r2mf3gvwr2l9amtlye0yd3c6dqa4th95v";
+  const rpcUrl = "https://rpc-testnet.sei-apis.com/";
+  const memo = "Delegation";
+  const path = "m/44'/60'/0'/0/0";
+
+  const {app} = await createTransportAndApp();
+  const {nativeAddress} = await getAddresses(app, path);
+  const ledgerSigner = new LedgerOfflineAminoSigner(app, path)
+  const signingStargateClient = await SigningStargateClient.connectWithSigner(rpcUrl, ledgerSigner)
+
+  const msgDelegate = {
+    typeUrl: "/cosmos.staking.v1beta1.MsgDelegate",
+    value: {
+      delegatorAddress: nativeAddress.address,
+      validatorAddress: validatorAddress,
+      amount: coins(500, "usei"),
+    },
+  };
+
+  const fee: StdFee = {
+    amount: [{denom: "usei", amount: "20000"}],
+    gas: "200000",
+  };
+
+  const result = await signingStargateClient.signAndBroadcast(nativeAddress.address, [msgDelegate], fee, memo)
+  console.log("Broadcast result:", result);
+};
+
+testApp();
+```

packages/ledger/eslintrc.json

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+{
+  "extends": ["../../eslint.base.json", "eslint:recommended", "plugin:@typescript-eslint/recommended"]
+}

packages/ledger/jest.config.ts

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+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+	preset: 'ts-jest',
+	testEnvironment: 'node',
+	testMatch: ['**/__tests__/**/*.ts?(x)', '**/?(*.)+(spec|test).ts?(x)'],
+	moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+	modulePathIgnorePatterns: ['<rootDir>/dist/']
+};

packages/ledger/package.json

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+{
+  "name": "@sei-js/ledger",
+  "version": "1.0.0",
+  "description": "TypeScript library for SEI Ledger app helper functions",
+  "main": "./dist/cjs/src/index.js",
+  "module": "./dist/esm/src/index.js",
+  "types": "./dist/types/src/index.d.ts",
+  "sideEffects": false,
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "prebuild": "rimraf dist",
+    "build": "yarn build:cjs && yarn build:esm && yarn build:prettier && yarn build:types",
+    "build:cjs": "tsc --outDir dist/cjs --module commonjs",
+    "build:esm": "tsc --outDir dist/esm --module esnext",
+    "build:types": "tsc --project ./tsconfig.declaration.json",
+    "build:prettier": "prettier --write 'dist/**/*.js'",
+    "docs": "typedoc --out docs",
+    "test": "jest --passWithNoTests",
+    "lint": "eslint --ext .ts"
+  },
+  "homepage": "https://github.com/sei-protocol/sei-js#readme",
+  "keywords": [
+    "sei",
+    "javascript",
+    "typescript",
+    "ledger"
+  ],
+  "repository": "git@github.com:sei-protocol/sei-js.git",
+  "license": "MIT",
+  "private": false,
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@cosmjs/stargate": "^0.32.4",
+    "@ledgerhq/hw-transport-node-hid": "^6.29.3",
+    "@zondax/ledger-sei": "^1.0.0"
+  },
+  "peerDependencies": {},
+  "devDependencies": {},
+  "exports": {
+    ".": {
+      "import": "./dist/esm/src/index.js",
+      "require": "./dist/cjs/src/index.js",
+      "types": "./dist/types/src/index.d.ts"
+    }
+  }
+}

packages/ledger/src/index.ts

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+export * from './wallet';

packages/ledger/src/wallet/index.ts

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+export * from "./utils"

packages/ledger/src/wallet/utils.ts

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+import Transport from '@ledgerhq/hw-transport-node-hid';
+import {
+  AminoSignResponse,
+  encodeSecp256k1Signature,
+  OfflineAminoSigner,
+  serializeSignDoc,
+  StdSignDoc
+} from '@cosmjs/amino';
+import {fromHex } from '@cosmjs/encoding';
+import { AccountData } from '@cosmjs/proto-signing';
+import { Secp256k1Signature } from '@cosmjs/crypto';
+import { SeiApp } from '@zondax/ledger-sei';
+
+/**
+ *  A signer implementation that uses a Ledger device to sign transactions
+ */
+export class LedgerOfflineAminoSigner implements OfflineAminoSigner {
+  private readonly path: string;
+  private readonly app: SeiApp;
+
+  /**
+   * Creates a new LedgerOfflineAminoSigner
+   * @param app Ledger Sei app instance
+   * @param path hd derivation path (e.g. "m/44'/60'/0'/0/0")
+   */
+  constructor(app: SeiApp, path: string) {
+    this.path = path;
+    this.app = app;
+  }
+
+  public async getAccounts(): Promise<readonly AccountData[]> {
+    const nativeAddress = await this.app.getCosmosAddress(this.path);
+    return [
+      {
+        address: nativeAddress.address,
+        algo: "secp256k1",
+        pubkey: fromHex(nativeAddress.pubKey)
+      },
+    ];
+  }
+
+  public async signAmino(signerAddress: string, signDoc: StdSignDoc): Promise<AminoSignResponse> {
+    const signature = await this.app.signCosmos(this.path, Buffer.from(serializeSignDoc(signDoc)));
+    const sig = new Secp256k1Signature(signature.r, signature.s).toFixedLength();
+    const nativeAddress = await this.app.getCosmosAddress(this.path);
+    return {
+      signed: signDoc,
+      signature: encodeSecp256k1Signature(fromHex(nativeAddress.pubKey), sig),
+    };
+  }
+}
+
+/**
+ * Creates a transport and app instance
+ *
+ * @returns {Promise<{transport: Transport, app: SeiApp}>} transport and app instances
+ */
+export const createTransportAndApp = async () => {
+  const transport = await Transport.create();
+  const app = new SeiApp(transport);
+  return {transport, app};
+};
+
+/**
+ * Get the EVM and Cosmos addresses from the Ledger device
+ * @param app Ledger Sei app instance
+ * @param path hd derivation path (e.g. "m/44'/60'/0'/0/0")
+ *
+ * @returns {Promise<{evmAddress: string, nativeAddress: string}>} EVM and Cosmos address objects containing
+ * address and public key
+ */
+export const getAddresses = async (app: SeiApp, path: string) => {
+  const evmAddress = await app.getEVMAddress(path);
+  const nativeAddress = await app.getCosmosAddress(path);
+  return {evmAddress, nativeAddress};
+};
+

packages/ledger/tsconfig.declaration.json

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+{
+  "extends": "./tsconfig.json",
+	"compilerOptions": {
+    "outDir": "./dist/types",
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "isolatedModules": false,
+    "preserveConstEnums": false
+  }
+}

packages/ledger/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["./src/**/*"  ],
+  "compilerOptions": {
+    "outDir": "./dist/types",
+    "rootDir": "./",
+  },
+  "typedocOptions": {
+    "readme": "./README.md",
+    "name": "registry",
+    "entryPoints": ["src/index.ts"]
+  }
+}