easeType
easeType:
| "linear"
| "linearNone"
| "linearIn"
| "linearInOut"
| "linearOut"
| "bounceIn"
| "bounceInOut"
| "bounceOut"
| "backIn"
| "backInOut"
| "backOut"
| "elasticIn"
| "elasticInOut"
| "elasticOut"
| "strongIn"
| "strongInOut"
| "strongOut"
| "sineInOut"
| "sineIn"
| "sineOut"
| "quintIn"
| "quintInOut"
| "quintOut"
| "quartIn"
| "quartInOut"
| "quartOut"
| "cubicIn"
| "cubicInOut"
| "cubicOut"
| "quadIn"
| "quadInOut"
| "quadOut"
| "expoIn"
| "expoInOut"
| "expoOut"
| "circIn"
| "circInOut"
| "circOut" = "quadOut"