Initial rebrand: @polkadot -> @pezkuwi (14 packages)

- Package namespace: @polkadot/* -> @pezkuwi/*
- Repository: polkadot-js/common -> pezkuwichain/pezkuwi-common
- Author: Pezkuwi Team <team@pezkuwichain.io>

Core packages:
- @pezkuwi/util (utilities)
- @pezkuwi/util-crypto (crypto primitives)
- @pezkuwi/keyring (account management)
- @pezkuwi/networks (chain metadata)
- @pezkuwi/hw-ledger (Ledger hardware wallet)
- @pezkuwi/x-* (10 polyfill packages)

Total: 14 packages
Upstream: polkadot-js/common v14.0.1

packages/util/src/has.ts

@@ -0,0 +1,38 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { BufferClass } from './types.js';
+
+import { BigInt } from '@pezkuwi/x-bigint';
+import { xglobal } from '@pezkuwi/x-global';
+
+// Since we run in very different environments, we have to ensure we have all
+// the types used here for detection (some of these may require Node definitions,
+// which are not available in Deno/browser)
+declare const __dirname: unknown;
+declare const module: unknown;
+declare const require: unknown;
+
+/** true if the environment has proper BigInt support */
+export const hasBigInt = typeof BigInt === 'function' && typeof BigInt.asIntN === 'function';
+
+/** true if the environment is CJS */
+export const hasCjs = typeof require === 'function' && typeof module !== 'undefined';
+
+/** true if the environment has __dirname available */
+export const hasDirname = typeof __dirname !== 'undefined';
+
+/** true if the environment is ESM */
+export const hasEsm = !hasCjs;
+
+/** true if the environment has WebAssembly available */
+export const hasWasm = typeof WebAssembly !== 'undefined';
+
+// NOTE We check the following on globalThis, avoiding specific polyfill detection
+// that some bundlers such as parcel would add (this is a check, not a use)
+
+/** true if the environment has support for Buffer (typically Node.js) */
+export const hasBuffer = typeof xglobal.Buffer === 'function' && typeof (xglobal.Buffer as unknown as BufferClass).isBuffer === 'function';
+
+/** true if the environment has process available (typically Node.js) */
+export const hasProcess = typeof xglobal.process === 'object';