Make artoolkit.api.js node.js compliant and remove references to DOM object in typescript version and javascript

[kalwalt]

There few key points to solve to make artoolkitNFT.api.js (to be precise the libs compiled with artoolkitNFT.api.js -> artoolkitNFT_wasm.js and artoolkitNFT.min.js) to use on node.js. At the moment it can not be used because there are DOM objects and self is not recognized as globalThis:

jsartoolkitNFT/js/artoolkitNFT.api.js

Lines 4 to 9 in 5a3230c

	var scope;
	if (typeof window !== 'undefined') {
	scope = window;
	} else {
	scope = self;
	}

self is accepted in a worker env but not under NODE.
I think that code should add a conditional with scope = global for the NODE env.
Plus we need to remove all references to canvas or document objects. We don't need them because we pass imageData. This is also applicable to the Typescript version and need a rewrite in this sense.

[kalwalt]

Inside artoolkitNFT.api.js and ARControllerNFT.ts will try to remove canvas, ctx, image, options, and orientation properties from ARControllerNFT class. Maybe i can remove other part of the code.

[kalwalt]

Inside artoolkitNFT.api.js and ARControllerNFT.ts will try to remove canvas, ctx, image, options, and orientation properties from ARControllerNFT class. Maybe i can remove other part of the code.

This is not enough, the lib will fail while loading the camera or other resources because it is based on XMLHttpRequest that is not supported on a Node.js environment. It's needed to change the ajax function to another that use FS.readFile(), we have already FS thanks to Emscripten, so it shouldn't be too difficult...

[kalwalt]

You can do this simple test, given this code:

var Module = require('../build/artoolkitNFT_wasm.js')

Module.onRuntimeInitialized = async function(){
 
    var ar = new ARControllerNFT(640, 480, '../examples/Data/camera_para.dat');
 
}

You will get this error:

ReferenceError: XMLHttpRequest is not defined
    at ajax (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:12857)
    at Object.loadCamera (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:12412)
    at ARCameraParamNFT.load (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:9344)
    at new ARCameraParamNFT (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:9043)
    at new ARControllerNFT (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:828)
    at Object.Module.onRuntimeInitialized (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/tests/test2.js:7:14)
    at doRun (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:781091)
    at run (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:781251)
    at runCaller (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:780759)
    at removeRunDependency (/home/walter/kalwalt-github/webarkit-org/jsartoolkitNFT/build/artoolkitNFT_wasm.js:1:23840)

[kalwalt]

Note that also the dist lib ARToolkitNFT.js will fails under node.js with a similar error.

[kalwalt]

We should build the dist lib with these instructions axios/axios#456 (comment)