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1000Number | String | TypeCallback

Determines the duration of your animation in milliseconds. By passing it a callback, you can define a different duration for each element. The callback takes the index of each element, the target dom element, and the total number of target elements as its argument and returns a number.

// First element fades out in 1s, second element in 2s, etc.
    target: ".div",
    easing: "linear",
    duration: 1000,
    // or
    duration: (index) => (index + 1) * 1000,
    opacity: [1, 0],