function getChildPropsBeforeEnter(animate, child, data, enteringNodes, cb) {
  if (enteringNodes) {
    // Perform a normal animation here, except - when it finishes - trigger
    // the transition for entering nodes.
    animate = assign({}, animate, { onEnd: cb });
    const before = animate.onEnter && animate.onEnter.before ? animate.onEnter.before : identity;
    // We want the entering nodes to be included in the transition target
    // domain.  However, we may not want these nodes to be displayed initially,
    // so perform the `onEnter.before` transformation on each node.
    data = data.map((datum, idx) => {
      const key = (datum.key || idx).toString();
      return enteringNodes[key] ? assign({}, datum, before(datum, idx, data)) : datum;
    });
  }

  return { animate, data };
}
function getChildPropsBeforeEnter(animate, child, data, enteringNodes, cb) {
  if (enteringNodes) {
    
    
    animate = assign({}, animate, { onEnd: cb });
    const before = animate.onEnter && animate.onEnter.before ? animate.onEnter.before : identity;
    
    
    
    data = data.map((datum, idx) => {
      const key = (datum.key || idx).toString();
      return enteringNodes[key] ? assign({}, datum, before(datum, idx, data)) : datum;
    });
  }

  return { animate, data };
}
function getChildPropsBeforeEnter ( animate , child , data , enteringNodes , cb ) { if ( enteringNodes ) { // Perform a normal animation here, except - when it finishes - trigger // the transition for entering nodes. animate = assign ( { } , animate , { onEnd : cb } ) ; const before = animate . onEnter && animate . onEnter . before ? animate . onEnter . before : identity ; // We want the entering nodes to be included in the transition target // domain.  However, we may not want these nodes to be displayed initially, // so perform the `onEnter.before` transformation on each node. data = data . map ( ( datum , idx ) => { const key = ( datum . key || idx ) . toString ( ) ; return enteringNodes [ key ] ? assign ( { } , datum , before ( datum , idx , data ) ) : datum ; } ) ; } return { animate , data } ; }
eslint-disable-next-line max-params,max-len
eslint - disable - next - line max - params max - len