nl_tokens: eslint - disable - next - line max - params max - len
pl_tokens: 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 , <mask> ( datum , idx , data ) ) : datum ; } ) ; } return { animate , data } ; }