feat(keyring-eth): new module

libs/ledgerjs/packages/keyring-eth/jest.config.ts

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+import baseConfig from "../../jest.config";
+
+export default {
+  ...baseConfig,
+  rootDir: __dirname,
+};

libs/ledgerjs/packages/keyring-eth/package.json

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+{
+  "name": "@ledgerhq/keyring-eth",
+  "version": "0.0.1",
+  "description": "Ledger keyring eth module",
+  "files": [
+    "./lib"
+  ],
+  "scripts": {
+    "build": "rimraf lib && tsc",
+    "test": "jest"
+  },
+  "keywords": [],
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@tsconfig/recommended": "^1.0.6",
+    "@types/jest": "^29.5.12",
+    "@types/node": "^20.12.7",
+    "jest": "^29.7.0",
+    "rimraf": "^5.0.5",
+    "ts-jest": "^29.1.2",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.4.5"
+  },
+  "dependencies": {
+    "@ledgerhq/context-module": "workspace:^",
+    "@ledgerhq/hw-app-eth": "workspace:^",
+    "@ledgerhq/hw-transport": "workspace:^",
+    "ethers": "^5.7.2"
+  }
+}

libs/ledgerjs/packages/keyring-eth/src/EthKeyring.ts

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+import { Transaction } from "ethers";
+import Transport from "@ledgerhq/hw-transport";
+import AppBinding from "@ledgerhq/hw-app-eth";
+import { ForwardDomainOptions } from "@ledgerhq/context-module/lib/models/LoaderOptions";
+import { EIP712Message } from "../../types-live/lib";
+
+type SignTransactionArgs = {
+  derivationPath: string;
+  transaction: Transaction;
+  options?: { forwardDomainOptions?: ForwardDomainOptions }; // TODO: TBD
+};
+
+type SignMessageArgs = {
+  derivationPath: string;
+  message: string | EIP712Message; // EIP-712/EIP-191
+  options: {
+    type: "EIP-191" | "EIP-712";
+    context: any; // TODO: TBD
+  };
+};
+
+type GetAddressArgs = {
+  derivationPath: string;
+  options: object; //TBD needVerify
+};
+
+export interface EthKeyring {
+  signTransaction(args: SignTransactionArgs): Promise<EcdsaSignature>;
+  signMessage(args: SignMessageArgs): Promise<EcdsaSignature>;
+  getAddress(args: GetAddressArgs): Promise<{ address: string; options: string }>;
+}
+
+export type EcdsaSignature = { r: `0x${string}`; s: `0x${string}`; v: number };
+
+export class DefaultEthKeyring implements EthKeyring {
+  private _appBinding: AppBinding;
+
+  constructor(transport: Transport) {
+    this._appBinding = new AppBinding(transport);
+  }
+
+  public async signTransaction({
+    derivationPath: _derivationPath,
+    transaction: _transaction,
+    options: _options,
+  }: SignTransactionArgs) {
+    return Promise.resolve({ r: "0x", s: "0x", v: 0 } as EcdsaSignature);
+  }
+
+  public async signMessage({
+    derivationPath: _derivationPath,
+    message: _message,
+    options: _options,
+  }: SignMessageArgs) {
+    return Promise.resolve({ r: "0x", s: "0x", v: 0 } as EcdsaSignature);
+  }
+
+  public async getAddress({ derivationPath: _derivationPath, options: _options }: GetAddressArgs) {
+    return Promise.resolve({ address: "", options: "" });
+  }
+}

libs/ledgerjs/packages/keyring-eth/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "lib"
+  },
+  "include": ["src/**/*"]
+}