title: what is the use of watchman for react native?
body: <p>Can anybody describe clearly what the use of watchman available in npm library?</p>
  
  <p>----Details I found---</p>
  
  <p>npm - npm is the largest NodeJS package manager</p>
  
  <p>NodeJS - Server-side Javascript runtime</p>
  
  <p>Watchman - Simple utility that watches files/directories for changes and performs an action when they change(This is not clear for me/ what it deoes?/is there any example?) </p>