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Can't execute a basic imwrite statement in OpenCV.js?

cv.imwrite('testimg.png', mat);

provides error below?

Uncaught TypeError: cv.imwrite is not a function at HTMLImageElement.img_input.onload (index.2.html:76)

Can't My version of opencv I am using w/require statement is https://docs.opencv.org/3.4.1/opencv.js from open cv web site.

My problem is that it doesn't seem to support imwrite statements (or at least I can't find inwrite when it's searched)

The result is I can't execute a basic imwrite statement in OpenCV.js?

Succh as
    cv.imwrite('testimg.png', mat);

provides the basic javascript error below?below:

Uncaught TypeError: cv.imwrite is not a function at HTMLImageElement.img_input.onload (index.2.html:76)

My version of opencv I am using w/require statement is https://docs.opencv.org/3.4.1/opencv.js from open cv web site.

My problem is that it doesn't seem to support imwrite statements (or at least I can't find inwrite imwrite when it's searched)

The result is I can't execute a basic imwrite statement in OpenCV.js?

Succh as cv.imwrite('testimg.png', mat);

provides the basic javascript error below:

Uncaught TypeError: cv.imwrite is not a function at HTMLImageElement.img_input.onload (index.2.html:76)

So I just want to confirm that 'https://docs.opencv.org/3.4.1/opencv.js' does not include imwrite, imdecode, etc

Thx