npm run build breaks in windows OS

[kumarana]

❌ [copy-spec] exited with exit code 1. Output:

Fix :

1. npm install --save-dev shx
2. Change

     "copy-spec": {
        "command": "mkdir -p src/0.8/schemas && cp ../../specification/0.8/json/*.json src/0.8/schemas",

 To 

 "copy-spec": {
    "command": "shx mkdir -p src/0.8/schemas && shx cp ../../specification/0.8/json/*.json src/0.8/schemas",

This shd fix it