[Tests] use `parallelshell` to parallelize npm run-scripts
[Tests] use `parallelshell` to parallelize npm run-scripts
airbnb/javascript,ljharb/javascript,nulogy/javascript,naustudio/javascript,codelegant/JavaScript,webcoding/javascript-style-guide,cloudability/javascript-style-guide,pokelondon/javascript,allanfish/javascript,addshoppers/javascript,xalexec/javascript,practicefusion/javascript,whichdigital/javascript-coding-standards,LodoSoftware/javascript-style-guide,codelegant/JavaScript,getjll/JavaScript-Style-Guide,appcom-interactive/javascript,bl00mber/javascript,LodoSoftware/javascript-style-guide,naustudio/javascript