Check if font has loaded

check-font-is-loaded.js

// see: https://www.zhangxinxu.com/wordpress/2022/04/js-font-face-load/
// see: https://developer.mozilla.org/en-US/docs/Web/API/FontFace/FontFace
 import fontUrl from 'fonts/SourceHanSansSC-Regular.otf'
 
 function check() {
     try {
       const font = new FontFace('SourceHanSansSC-Regular', `url(${fontUrl})`)
       await font.load()
       // load success
     } catch (e) {
       console.error(e)
       // load failed
     }
 }