index.js
function removeChild(parent, child) {
        var parentChildIdx = parent._children.indexOf(child)
        parent._children.splice(parentChildIdx, 1)
        incChildrenVersion(parent)
        return parent
    }
function removeChild(parent, child) {
        var parentChildIdx = parent._children.indexOf(child)
        parent._children.splice(parentChildIdx, 1)
        incChildrenVersion(parent)
        return parent
    }
function removeChild ( parent , child ) { var parentChildIdx = parent . _children . indexOf ( child ) parent . _children . splice ( parentChildIdx , 1 ) incChildrenVersion ( parent ) return parent }
remove child from pnode
remove child from pnode