@wizdm/animate/esm2015/lib/animate.config.js

On Scroll Animation for Angular

import { InjectionToken } from '@angular/core';
/** Animate config token */
export const ANIMATE_CONFIG = new InjectionToken('wizdm.animate.config');
/** Builds the config object checking whenever the Browser support the IntersectionObserver API */
export function animateConfigFactory(value) {
    // Starts with the given mode defaulting to auto detection
    let triggerMode = value && value.triggerMode || 'auto';
    if (triggerMode === 'auto' || triggerMode === 'intersectionObserver') {
        // Checks for Browser IntersectionObserver support  
        const ioSupported = 'IntersectionObserver' in window &&
            'IntersectionObserverEntry' in window &&
            'intersectionRatio' in window.IntersectionObserverEntry.prototype;
        // Applies the best mode
        triggerMode = ioSupported ? 'intersectionObserver' : 'scrolling';
    }
    // Ensure to use scrolling otherwise
    else {
        triggerMode = 'scrolling';
    }
    // Returns the config object 
    return Object.assign(Object.assign({}, value), { triggerMode });
}
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