Please allow promise for transforms

[cxa]

As the title, e.g. I need to extend transforms:

const extendTransforms = (builtins) => {
  const getBase64 = async (image) => {
    const img = image.resize({ width: 10 });
    const buf = await img.toBuffer();
    const mt = await img.metadata();
    return `data:image/${mt.format};base64,${buf.toString("base64")}`;
  };

  function base64(config, ctx) {
    if (config.width != "10") return;
    return async (image) => {
      setMetadata(image, "base64", await getBase64(image));
      return image;
    };
  }

  return [base64, ...builtins];
};

imagetools({ extendTransforms })

[JonasKruckenberg]

Absolutely! I already committed the change, it should go to npm in a couple minutes!
One caveat however: On the transform functions can be async, so

function blur() {
    return async () => {}
}

would work, but

async function blur() {
    return () => {}
}

would not. This shouldn't be a problem for most use cases though.