How to use the ember-animated/motions/opacity.fadeIn function in ember-animated

keptSprites.map(sprite => {
        fadeIn(sprite);
        move(sprite);
      });
      insertedSprites.forEach(fadeIn);

keptSprites.forEach((sprite: Sprite) => {
            parallel(
                fadeIn(sprite),
                move(sprite, { easing: easeIn }),
            );
        });
        removedSprites.forEach((sprite: Sprite) => fadeOut(sprite));

*originalTransition({ insertedSprites, removedSprites, keptSprites }) {
    for (let sprite of insertedSprites) {
      fadeIn(sprite);
    }

    for (let sprite of keptSprites) {
      sprite.moveToFinalPosition();
      fadeIn(sprite);
    }

    for (let sprite of removedSprites) {
      fadeOut(sprite);
    }
  },

insertedSprites.forEach(sprite => {
      fadeIn(sprite, { duration });
    });
    removedSprites.forEach(sprite => {

        insertedSprites.forEach((sprite: Sprite) => fadeIn(sprite));
        keptSprites.forEach((sprite: Sprite) => {