Export all Omnigraffle canvases as images

Export all.omnijs

/*{
    "type": "action",
	"description": "Export images from current document.",
	"label": "Export Canvases",
	"paletteLabel": "Export Canvases"
}*/

var _ = function () {

    var action = new PlugIn.Action(function (selection) {
        // Add code to run when the action is invoked
        console.log("Invoked with selection", selection);

        let types = ['com.adobe.pdf', 'public.svg-image']
        let promises = []
        let current = document.windows[0].selection.view.canvas

        canvases.forEach(canvas => {
            let name = canvas.name;
            console.log("name", name);
            document.windows[0].selection.view.canvas = canvas
            promises = promises.concat(types.map(type => document.makeFileWrapper(name, type)));

        });

        // put it back
        document.windows[0].selection.view.canvas = current

        console.log("promises", promises)

        Promise.all(promises).then(function (fileWrappers) {
            let map = new Map();

            fileWrappers.forEach(function (fileWrapper) {
                let split = fileWrapper.preferredFilename.split(".");
                let type = split[split.length - 1];

                if (!map.has(type)) {
                    console.log("creating type: ", type);
                    map.set(type, []);
                }

                map.get(type).push(fileWrapper);
            })

            console.log("map:", map);

            let children = [];

            map.forEach((key,value)=>{
                console.log("each:", value,key)
                children.push( FileWrapper.withChildren(value,key));
            })

            Promise.all(children).then(function (childWrappers) {
                let parent = FileWrapper.withChildren("images", childWrappers);

                new FileSaver().show(parent);
            })
        })
            .catch(function (error) {
                console.log("Error", error);
            });

    });

    action.validate = function (selection) {
        console.log("selection", selection);
        if (!selection) {
            return false;
        }
        console.log("selection.document", selection.document);
        return selection.document != undefined;
    };

    return action;
}();
_;