@vladmandic/face-api/src/dom/awaitMediaLoaded.ts

FaceAPI: AI-powered Face Detection & Rotation Tracking, Face Description & Recognition, Age & Gender & Emotion Prediction for Browser and NodeJS using TensorFlow/JS

import { env } from '../env/index';
import { isMediaLoaded } from './isMediaLoaded';

export function awaitMediaLoaded(media: HTMLImageElement | HTMLVideoElement | HTMLCanvasElement) {
  // eslint-disable-next-line consistent-return
  return new Promise((resolve, reject) => {
    if (media instanceof env.getEnv().Canvas || isMediaLoaded(media)) return resolve(null);

    function onError(e: Event) {
      if (!e.currentTarget) return;
      // eslint-disable-next-line no-use-before-define
      e.currentTarget.removeEventListener('load', onLoad);
      e.currentTarget.removeEventListener('error', onError);
      reject(e);
    }

    function onLoad(e: Event) {
      if (!e.currentTarget) return;
      e.currentTarget.removeEventListener('load', onLoad);
      e.currentTarget.removeEventListener('error', onError);
      resolve(e);
    }

    media.addEventListener('load', onLoad);
    media.addEventListener('error', onError);
  });
}