System information (version)

• OpenCV => 3.4
• Operating System / Platform => Mac OS X ( Related to JS version of Open CV)
• JS has been built using branch 3.4

Detailed description

Was trying to use orb.detect() function in JS but it throws errors:

Cannot call Feature2D.detect due to unbound types: NSt3__26vectorIN2cv8KeyPointENS_9allocatorIS2_EEEE↵ at UnboundTypeError

Steps to reproduce

Use the steps as mentioned in the tutorial to include JS file in your code
and then when opencv has been loaded into Browser memory run this code

console.log(cv);
let imgMat = cv.imread(imgElement);
let orb = new cv.ORB();
let kp = orb.detect(imgMat,"");
console.log("kp",kp);
// let result = orb.compute(imgMat,kp);
// console.log("result",result);
mat.delete();