+// Thanks: https://github.com/uupaa/dynamic-import-polyfill
+function importModule (path: string) {
+ return new Promise((resolve, reject) => {
+ const vector = '$importModule$' + Math.random().toString(32).slice(2)
+ const script = document.createElement('script')
+
+ const destructor = () => {
+ delete window[ vector ]
+ script.onerror = null
+ script.onload = null
+ script.remove()
+ URL.revokeObjectURL(script.src)
+ script.src = ''
+ }
+
+ script.defer = true
+ script.type = 'module'
+
+ script.onerror = () => {
+ reject(new Error(`Failed to import: ${path}`))
+ destructor()
+ }
+ script.onload = () => {
+ resolve(window[ vector ])
+ destructor()
+ }
+ const absURL = (environment.apiUrl || window.location.origin) + path
+ const loader = `import * as m from "${absURL}"; window.${vector} = m;` // export Module
+ const blob = new Blob([ loader ], { type: 'text/javascript' })
+ script.src = URL.createObjectURL(blob)
+
+ document.head.appendChild(script)
+ })
+}
+
+function isInViewport (el: HTMLElement) {
+ const bounding = el.getBoundingClientRect()
+ return (
+ bounding.top >= 0 &&
+ bounding.left >= 0 &&
+ bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
+ bounding.right <= (window.innerWidth || document.documentElement.clientWidth)
+ )
+}
+
+function isXPercentInViewport (el: HTMLElement, percentVisible: number) {
+ const rect = el.getBoundingClientRect()
+ const windowHeight = (window.innerHeight || document.documentElement.clientHeight)
+
+ return !(
+ Math.floor(100 - (((rect.top >= 0 ? 0 : rect.top) / +-(rect.height / 1)) * 100)) < percentVisible ||
+ Math.floor(100 - ((rect.bottom - windowHeight) / rect.height) * 100) < percentVisible
+ )
+}
+