Set Theme Related To System

setThemeRelatedToSystem.js

const setThemeRelatedToSystem = () => {
  
  const getSystemtheme = () => {
    // ... rest of the function code
  }
  
  const setTheme = (theme) => {
      // ... rest of the funciton code
  }
  
  const watchSystemTheme = (cb) => {
      // ... rest of the function code
  }
  
  // For the initial state
  
  const systemTheme = getSystemTheme();
  setTheme(systemTheme);
  
  // Then start to watch for changes
  
  watchSystemTheme((theme) => { // 
    setTheme(theme)             // or watchTheme(systemTheme) if u know e6 and above
  })                            // 
  
  
  
}