decompose homography matrix in opencv.js

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Hi guys, I'm currently working on an image tracking application using opencv.js (3.4 if I'm not wrong) and I'm missing an effective way to get some transformations in this environment.

I managed to get the homography using detected and matched key points of the two images. However, I need a way to decompose this homography into other transformation matrices as it is described here: https://docs.opencv.org/master/d9/dab... (Demo 4). Unfortunately, the function decomposeHomographyMat does not seem to be implemented on my openCV version for javascript. Does anyone have a solution for this? Either a more recent version of opencv.js or a nice example to make the task using a different method.