SIFT algorithm in opencvjs is undefined

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I have read these two posts, but the problem does not seem to be solved. I tried to add the SITF whitelist to be consistent with ORB, but I can only use the ORB algorithm and cannot use the SIFT algorithm. I understand that since the patent expires in 2020, SIFT should have been included in the main library, but I still can’t use it. Perhaps you can provide me with an opencv.js file