microtween

microtween is a tiny tweening library based on cubic bezier curves. It's a tweening API built on a slightly modified version of gre/bezier-easing.

const tween = microtween({
  from: { x: 0,   y: 100 },
  to:   { x: 100, y: 0   },
  time: 3000,
  update: props => {
    element.style.transform = `translate(${props.x}px, ${props.y}px)`
  }
}).then(props => {
  // Do something at the end
})

The update function is called within requestAnimationFrame, so you're free to update styles and DOM elements without causing major performance issues.

You can use the default easing, specify a built in easing, or define your own on the fly:

// By reference
microtween({
  // ...
  easing: microtween.ease.elastic
})

// By name
microtween({
  // ...
  easing: 'circular'
})

// By value
microtween({
  // ...
  easing: [0.53, 1, 0.15, 1.2]
})

Included Curves

These are the included curves:

• default (0.25, 0.12, 0.31, 1)
• linear (0, 0, 1, 1)
• easeOut (0, 0, 0.58, 1)
• circular (0, 0.6, 0.4, 1)
• elastic (0.53, 1, 0.15, 1.2)
• elasticStrong (0.75, -0.5, 0, 1.75)
• expo (0.19, 0.85, 0.64, 1.01)

cubic-bezier.com is an awesome tool to check out if you're interested in creating your own.

Project Status

microtween is currently not actively developed, but it is in active use in a few of my projects.