Refactor SDK into modular and functional packages for better developer experience and maintainability

packages/bcs/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "@aptos-labs/bcs",
+  "version": "1.0.0",
+  "description": "BCS (Binary Canonical Serialization) library for Aptos",
+  "main": "./dist/cjs/index.js",
+  "module": "./dist/esm/index.mjs",
+  "types": "./dist/esm/index.d.mts",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/esm/index.d.mts",
+        "default": "./dist/esm/index.mjs"
+      },
+      "require": {
+        "types": "./dist/cjs/index.d.ts",
+        "default": "./dist/cjs/index.js"
+      }
+    }
+  },
+  "files": [
+    "dist",
+    "package.json"
+  ],
+  "scripts": {
+    "build": "tsup",
+    "dev": "tsup --watch",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "aptos",
+    "bcs",
+    "serialization"
+  ],
+  "author": "",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "@aptos-labs/utils": "workspace:*",
+    "@noble/hashes": "^1.5.0"
+  },
+  "devDependencies": {
+    "tsup": "^8.5.0",
+    "typescript": "^5.8.3"
+  }
+}
+

packages/bcs/src/consts.ts

@@ -0,0 +1,19 @@
+// Copyright © Aptos Foundation
+// SPDX-License-Identifier: Apache-2.0
+
+import { Uint8, Uint16, Uint32, Uint64, Uint128, Uint256 } from "./types";
+
+// Upper bound values for uint8, uint16, uint64 etc.  These are all derived as
+// 2^N - 1, where N is the number of bits in the type.
+export const MAX_U8_NUMBER: Uint8 = 255;
+export const MAX_U16_NUMBER: Uint16 = 65535;
+export const MAX_U32_NUMBER: Uint32 = 4294967295;
+export const MAX_U64_BIG_INT: Uint64 = 18446744073709551615n;
+export const MAX_U128_BIG_INT: Uint128 = 340282366920938463463374607431768211455n;
+export const MAX_U256_BIG_INT: Uint256 =
+  115792089237316195423570985008687907853269984665640564039457584007913129639935n;
+
+
+
+
+