Add has* env detection (#1207)

CHANGELOG.md

@@ -9,6 +9,7 @@ Changes:
 - Add `bi*` utilities for `bigint` operations (mirror of `bn*`)
 - Add `stringPascalCase` utility
 - Add `isCodec` to check for Codec-like structures
+- Add `has*` detection shortcuts (e.g. `hasWasm` or `hasBuffer`)
 - Optimize for `hexToU8a` and `u8aToHex` functions
 - Optimize `u8aEq` to use `DataView` for compares
 - Space optimization for bip39 wordlists

packages/util/src/bundle.ts

@@ -14,6 +14,7 @@ export * from './buffer';
 export * from './compact';
 export * from './extractTime';
 export * from './format';
+export * from './has';
 export * from './hex';
 export * from './is';
 export * from './lazy';

packages/util/src/has.ts

@@ -0,0 +1,8 @@
+// Copyright 2017-2021 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export const hasBigInt = typeof BigInt !== 'undefined';
+export const hasBuffer = typeof Buffer !== 'undefined';
+export const hasDirname = typeof __dirname !== 'undefined';
+export const hasProcess = typeof process === 'object';
+export const hasWasm = typeof WebAssembly !== 'undefined';

packages/util/src/is/buffer.ts

@@ -1,6 +1,8 @@
 // Copyright 2017-2021 @polkadot/util authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import { hasBuffer } from '../has';
+
 /**
  * @name isBuffer
  * @summary Tests for a `Buffer` object instance.
@@ -16,5 +18,5 @@
  * ```
  */
 export function isBuffer (value: unknown): value is Buffer {
-  return typeof Buffer !== 'undefined' && Buffer.isBuffer(value);
+  return hasBuffer && Buffer.isBuffer(value);
 }

packages/util/src/logger.ts

@@ -11,6 +11,7 @@ import { isObject } from './is/object';
 import { isU8a } from './is/u8a';
 import { u8aToHex } from './u8a/toHex';
 import { u8aToU8a } from './u8a/toU8a';
+import { hasProcess } from './has';
 
 type ConsoleType = 'error' | 'log' | 'warn';
 type LogType = ConsoleType | 'debug';
@@ -121,7 +122,7 @@ function getDebugFlag (env: string[], type: string): boolean {
 }
 
 function parseEnv (type: string): [boolean, number] {
-  const env = (typeof process === 'object' ? process : {}).env || {};
+  const env = (hasProcess ? process : {}).env || {};
   const maxSize = parseInt(env.DEBUG_MAX || '-1', 10);
 
   return [