face-api/src/factories/WithFaceExpressions.ts

import { FaceExpressions } from '../faceExpressionNet/FaceExpressions';

export type WithFaceExpressions<TSource> = TSource & { expressions: FaceExpressions }

export function isWithFaceExpressions(obj: any): obj is WithFaceExpressions<{}> {
  return obj.expressions instanceof FaceExpressions;
}

export function extendWithFaceExpressions<TSource>(sourceObj: TSource, expressions: FaceExpressions): WithFaceExpressions<TSource> {
  const extension = { expressions };
  return { ...sourceObj, ...extension };
}