download.js: SAVE data TO file (aka 'export/download') plus openInNewWindow(data, type = "octet-stream")

download.js

/////// download.js: SAVE data TO file (aka 'export/download')...

//// const download_MIN=(d,f=`file-${+new Date}.txt`,t="octet-stream")=>{const h=URL.createObjectURL(new Blob([d].slice(void 0===d),{type:t})),s=null!==f;return Object.assign(document.createElement("a"),{href:h,[s&&"download"]:f,target:"_blank"}).click(),s&&URL.revokeObjectURL(h)};
const download = (
	data
	, filename = `file-${+new Date}.txt`	// null means download: filename OMITTED = DISPLAY data in browser
	, type = "octet-stream"					// default is ~ "application/octet-binary"
) => {
	const href = URL.createObjectURL(new Blob(	// https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob
		[data].slice(data === undefined)
		, { type }
	));
	const save = filename !== null;
	Object.assign(document.createElement("a"), {
		href
		, [save && "download"]: filename	// , download: filename OMITTED = DISPLAY data in browser instead of saving file e.g. [blob:<location.origin>/79b9264f-c0f4-4354-a655-d6cc084acb69]
		, target: "_blank"					// NEW TAB for [blob:<location.origin>/abc-12-34-def]
	}).click();
	return save && URL.revokeObjectURL(href);
};

const openInNewWindow = (d, t) => download(d, null, t);

const openInNewWindow_standalone=(d,t="octet-stream")=>Object.assign(document.createElement("a"),{href:URL.createObjectURL(new Blob([d].slice(d===void 0),{type:"text"===t?t+"/plain;charset=utf-8":t})),target:"_blank"}).click();
// const openInNewWindow_standalone = (data, type = "octet-stream") => Object.assign(
// 	document.createElement("a"), {
// 		href: URL.createObjectURL(
// 			new Blob([data].slice(data === undefined), {
// 				type: type !== "text" ? type : (type + "/plain;charset=utf-8")
// 			})
// 		),
// 		target: "_blank",
// 	}
// ).click();	// utf-8 suffix by default if type === "text" (to easily retain emojis like this...)
//var b = "🤦‍♂🌞 have a great weekend   "; console.log(b); console.log(b = new Blob([b], {type: "text/plain; charset=utf-8"}), b = URL.createObjectURL(b)); window.open(b); !!b;
// "🤦‍♂️🌞 have a great weekend   "
// true



/////// examples with simple plaintext dataString (output = various values for MIME type)

const dataString = "\nthe\n\n\tcontents"

// download text as myFilename.ext
download(dataString, "myFilename.ext");

// display text inside new tab (method 1/2)
download(dataString, null);

// display text inside new tab (method 2/2)
openInNewWindow(dataString);

// display text AS PNG (will not be usable, of course) inside new tab (via method 2)
openInNewWindow(dataString, "image/png");

// display text AS ZIP (will prompt to download, because .ZIP!) inside new tab (via method 2)
openInNewWindow(dataString, "application/zip");

// display text AS Windows' custom MIME type for ZIP (will prompt to download, because .ZIP!) inside new tab (via method 2)
openInNewWindow(dataString, "application/x-zip-compressed");