Add a constant to check if platform is WASM

Author: agriyakhetarpal

numcodecs/tests/common.py

@@ -2,6 +2,8 @@
 import json as _json
 import os
 from glob import glob
+import platform
+import sys
 
 
 import numpy as np
@@ -20,6 +22,8 @@
              'こんにちは世界', '世界，你好！', 'Helló, világ!', 'Zdravo svete!',
              'เฮลโลเวิลด์']
 
+is_wasm = (sys.platform == 'emscripten') or (platform.machine() in ['wasm32', 'wasm64'])
+
 
 def compare_arrays(arr, res, precision=None):