feat: add asset modules

package.json

@@ -3,12 +3,12 @@
   "private": true,
   "packageManager": "pnpm@10.6.2",
   "scripts": {
-    "build": "turbo run build --filter=gridplus-sdk --filter=@gridplus/btc --filter=@gridplus/types",
+    "build": "turbo run build --filter=gridplus-sdk --filter=@gridplus/asset-core --filter=@gridplus/btc --filter=@gridplus/cosmos --filter=@gridplus/evm --filter=@gridplus/solana --filter=@gridplus/types",
     "test": "turbo run test --filter=gridplus-sdk --filter=@gridplus/btc",
     "test-unit": "turbo run test-unit --filter=gridplus-sdk --filter=@gridplus/btc",
-    "lint": "turbo run lint --filter=gridplus-sdk --filter=@gridplus/btc --filter=@gridplus/types",
-    "lint:fix": "turbo run lint:fix --filter=gridplus-sdk --filter=@gridplus/btc --filter=@gridplus/types",
-    "typecheck": "turbo run typecheck --filter=gridplus-sdk --filter=@gridplus/btc --filter=@gridplus/types",
+    "lint": "turbo run lint --filter=gridplus-sdk --filter=@gridplus/asset-core --filter=@gridplus/btc --filter=@gridplus/cosmos --filter=@gridplus/evm --filter=@gridplus/solana --filter=@gridplus/types",
+    "lint:fix": "turbo run lint:fix --filter=gridplus-sdk --filter=@gridplus/asset-core --filter=@gridplus/btc --filter=@gridplus/cosmos --filter=@gridplus/evm --filter=@gridplus/solana --filter=@gridplus/types",
+    "typecheck": "turbo run typecheck --filter=gridplus-sdk --filter=@gridplus/asset-core --filter=@gridplus/btc --filter=@gridplus/cosmos --filter=@gridplus/evm --filter=@gridplus/solana --filter=@gridplus/types",
     "e2e": "turbo run e2e --filter=gridplus-sdk",
     "docs:build": "pnpm --filter gridplus-sdk-docs run build",
     "docs:start": "pnpm --filter gridplus-sdk-docs run start"

packages/assets/asset-core/package.json

@@ -0,0 +1,41 @@
+{
+  "name": "@gridplus/asset-core",
+  "version": "0.1.0",
+  "type": "module",
+  "description": "Shared asset interface types for GridPlus SDK",
+  "scripts": {
+    "build": "tsup",
+    "lint": "biome check src",
+    "lint:fix": "biome check --write src",
+    "typecheck": "tsc --noEmit"
+  },
+  "files": [
+    "dist"
+  ],
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.mjs",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs"
+    },
+    "./package.json": "./package.json"
+  },
+  "types": "./dist/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/GridPlus/gridplus-sdk.git",
+    "directory": "packages/assets/asset-core"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "^1.9.0",
+    "@types/node": "^24.10.4",
+    "tsup": "^8.5.0",
+    "typescript": "^5.9.2"
+  },
+  "license": "MIT",
+  "engines": {
+    "node": ">=20"
+  }
+}

packages/assets/asset-core/src/index.ts

@@ -0,0 +1,102 @@
+export type DerivationPath = number[];
+export type Address = string;
+export type PublicKey = Uint8Array;
+
+export type Signature = {
+  bytes: Uint8Array;
+  r?: Uint8Array;
+  s?: Uint8Array;
+  v?: number | bigint;
+};
+
+export type SignResult = {
+  signature: Signature;
+  publicKey?: PublicKey;
+  signedPayload?: Uint8Array | string;
+  txHash?: string;
+  metadata?: Record<string, unknown>;
+};
+
+export type Account = {
+  address: Address;
+  publicKey?: PublicKey;
+  path: DerivationPath;
+  index?: number;
+};
+
+export type AssetCapabilities = {
+  signTransaction: boolean;
+  signMessage: boolean;
+  signTypedData: boolean;
+  signArbitrary: boolean;
+  getPublicKey: boolean;
+  getXpub?: boolean;
+};
+
+export type GetAddressParams = {
+  path?: DerivationPath;
+  accountIndex?: number;
+  change?: number;
+  addressIndex?: number;
+};
+
+export type GetPublicKeyParams = {
+  path?: DerivationPath;
+  accountIndex?: number;
+  change?: number;
+  addressIndex?: number;
+  compressed?: boolean;
+};
+
+export type GetAccountsParams = {
+  startIndex?: number;
+  count?: number;
+  includePublicKey?: boolean;
+  change?: number;
+};
+
+export type SignRequest =
+  | { kind: 'transaction'; payload: unknown; options?: unknown }
+  | { kind: 'message'; payload: string | Uint8Array; options?: unknown }
+  | { kind: 'typedData'; payload: unknown; options?: unknown }
+  | { kind: 'arbitrary'; payload: Uint8Array; options?: unknown };
+
+export type Signer<TSignRequest = SignRequest> = {
+  getAddress: (path: DerivationPath, options?: unknown) => Promise<Address>;
+  getPublicKey: (path: DerivationPath, options?: unknown) => Promise<PublicKey>;
+  sign: (request: TSignRequest) => Promise<SignResult>;
+};
+
+export type AssetAdapter<
+  TSignRequest = SignRequest,
+  TGetAddressParams = GetAddressParams,
+  TGetAccountsParams = GetAccountsParams,
+  TGetPublicKeyParams = GetPublicKeyParams,
+  TAccount = Account,
+> = {
+  getAddress(params?: TGetAddressParams): Promise<Address>;
+  getAddresses(params?: TGetAccountsParams): Promise<Address[]>;
+  getPublicKey(params?: TGetPublicKeyParams): Promise<PublicKey>;
+  getPublicKeys?(params?: TGetAccountsParams): Promise<PublicKey[]>;
+  getAccount?(params?: TGetAddressParams): Promise<TAccount>;
+  getAccounts?(params?: TGetAccountsParams): Promise<TAccount[]>;
+  sign(request: TSignRequest): Promise<SignResult>;
+  validateAddress?(address: Address): boolean;
+  normalizeAddress?(address: Address): Address;
+};
+
+export type AssetModule<
+  TSignRequest = SignRequest,
+  TAdapter extends AssetAdapter<TSignRequest> = AssetAdapter<TSignRequest>,
+  TOptions = unknown,
+  TSigner extends Signer<TSignRequest> = Signer<TSignRequest>,
+> = {
+  readonly id: string;
+  readonly name: string;
+  readonly coinType: number;
+  readonly curve: 'secp256k1' | 'ed25519' | 'bls12-381';
+  readonly defaultPath: DerivationPath;
+  readonly supports: AssetCapabilities;
+  create: (signer: TSigner, options?: TOptions) => TAdapter;
+  utils: Record<string, unknown>;
+};

packages/assets/asset-core/tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "declaration": true,
+    "declarationMap": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "lib": ["ES2022", "DOM"],
+    "module": "ES2022",
+    "moduleResolution": "Bundler",
+    "outDir": "./dist",
+    "resolveJsonModule": true,
+    "rootDir": "./src",
+    "skipDefaultLibCheck": true,
+    "skipLibCheck": true,
+    "sourceMap": true,
+    "strict": true,
+    "target": "ES2022",
+    "types": ["node"]
+  },
+  "exclude": ["node_modules"],
+  "include": ["src"]
+}

packages/assets/btc/biome.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "extends": ["../../biome.json"],
+  "files": {
+    "include": ["src/**/*.ts"],
+    "ignore": ["**/dist/**", "**/node_modules/**"]
+  }
+}

packages/btc/package.json → packages/assets/btc/package.json

@@ -27,9 +27,10 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/GridPlus/gridplus-sdk.git",
-    "directory": "packages/btc"
+    "directory": "packages/assets/btc"
   },
   "dependencies": {
+    "@gridplus/asset-core": "workspace:*",
     "bs58check": "^4.0.0"
   },
   "devDependencies": {