src/backend/index.js
function scan () {
  rootInstances.length = 0
  let inFragment = false
  let currentFragment = null

  function processInstance (instance) {
    if (instance) {
      if (rootInstances.indexOf(instance.$root) === -1) {
        instance = instance.$root
      }
      if (instance._isFragment) {
        inFragment = true
        currentFragment = instance
      }

      // respect Vue.config.devtools option
      let baseVue = instance.constructor
      while (baseVue.super) {
        baseVue = baseVue.super
      }
      if (baseVue.config && baseVue.config.devtools) {
        // give a unique id to root instance so we can
        // 'namespace' its children
        if (typeof instance.__VUE_DEVTOOLS_ROOT_UID__ === 'undefined') {
          instance.__VUE_DEVTOOLS_ROOT_UID__ = ++rootUID
        }
        rootInstances.push(instance)
      }

      return true
    }
  }

  if (isBrowser) {
    walk(document, function (node) {
      if (inFragment) {
        if (node === currentFragment._fragmentEnd) {
          inFragment = false
          currentFragment = null
        }
        return true
      }
      let instance = node.__vue__

      return processInstance(instance)
    })
  } else {
    if (Array.isArray(target.__VUE_ROOT_INSTANCES__)) {
      target.__VUE_ROOT_INSTANCES__.map(processInstance)
    }
  }
  hook.emit('router:init')
  flush()
}
function scan () {
  rootInstances.length = 0
  let inFragment = false
  let currentFragment = null

  function processInstance (instance) {
    if (instance) {
      if (rootInstances.indexOf(instance.$root) === -1) {
        instance = instance.$root
      }
      if (instance._isFragment) {
        inFragment = true
        currentFragment = instance
      }

      // respect Vue.config.devtools option
      let baseVue = instance.constructor
      while (baseVue.super) {
        baseVue = baseVue.super
      }
      if (baseVue.config && baseVue.config.devtools) {
        // give a unique id to root instance so we can
        // 'namespace' its children
        if (typeof instance.__VUE_DEVTOOLS_ROOT_UID__ === 'undefined') {
          instance.__VUE_DEVTOOLS_ROOT_UID__ = ++rootUID
        }
        rootInstances.push(instance)
      }

      return true
    }
  }

  if (isBrowser) {
    walk(document, function (node) {
      if (inFragment) {
        if (node === currentFragment._fragmentEnd) {
          inFragment = false
          currentFragment = null
        }
        return true
      }
      let instance = node.__vue__

      return processInstance(instance)
    })
  } else {
    if (Array.isArray(target.__VUE_ROOT_INSTANCES__)) {
      target.__VUE_ROOT_INSTANCES__.map(processInstance)
    }
  }
  hook.emit('router:init')
  flush()
}
function scan ( ) { rootInstances . length = 0 let inFragment = false let currentFragment = null function processInstance ( instance ) { if ( instance ) { if ( rootInstances . indexOf ( instance . $root ) === - 1 ) { instance = instance . $root } if ( instance . _isFragment ) { inFragment = true currentFragment = instance } // respect Vue.config.devtools option let baseVue = instance . constructor while ( baseVue . super ) { baseVue = baseVue . super } if ( baseVue . config && baseVue . config . devtools ) { // give a unique id to root instance so we can // 'namespace' its children if ( typeof instance . __VUE_DEVTOOLS_ROOT_UID__ === 'undefined' ) { instance . __VUE_DEVTOOLS_ROOT_UID__ = ++ rootUID } rootInstances . push ( instance ) } return true } } if ( isBrowser ) { walk ( document , function ( node ) { if ( inFragment ) { if ( node === currentFragment . _fragmentEnd ) { inFragment = false currentFragment = null } return true } let instance = node . __vue__ return processInstance ( instance ) } ) } else { if ( Array . isArray ( target . __VUE_ROOT_INSTANCES__ ) ) { target . __VUE_ROOT_INSTANCES__ . map ( processInstance ) } } hook . emit ( 'router:init' ) flush ( ) }
Scan the page for root level Vue instances.
Scan the page for root level Vue instances .