Stagger library for Theatre.js

First of all, it is needed to give some definitons:

• Project Theatre's project object which is made using Theatre.getProject(...)
• Element Non-primitive objects which are going to act inside a stagger
• Middleware Defines which props are going to be used in this stagger and how they effect mentioned elements

const stagger = createTheatreStagger('MyStagger', {
    project: MyProject /* Theatre Project */,
    elements: [
        /* Array of elements*/
    ],
    middlewares: [
        /* Array of middlewares */
    ],
})

stagger.play()

Middlewares will be run in a queue, as you put them in middlewares array. Each Middleware can decide whether it is allowed to go through next Middleware or not by calling next() function.

Theatre Stagger Middlewares are similar to Express Middlewares in use.

const opacityMiddleware = {
    props: ['opacity'],
    onValueChanges: (element, values, next) => {
        const { opacity } = values
        element.style.opacity = opacity
        next()
    },
}