Updated Answer

This is now something you can do natively in JavaScript/TypeScript with crypto.randomUUID().

Here's an example generating 20 UUIDs.

for (let i = 0; i < 20; i++) {
let id = crypto.randomUUID();
console.log(id);
}

Original Answer

There is an implementation in my TypeScript utilities based on JavaScript GUID generators.

Here is the code:

class Guid {
static newGuid() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
var r = Math.random() * 16 | 0,
v = c == 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
}


// Example of a bunch of GUIDs
for (var i = 0; i < 20; i++) {
var id = Guid.newGuid();
console.log(id);
}

Please note the following:

C# GUIDs are guaranteed to be unique. This solution is very likely to be unique. There is a huge gap between "very likely" and "guaranteed" and you don't want to fall through this gap.

JavaScript-generated GUIDs are great to use as a temporary key that you use while waiting for a server to respond, but I wouldn't necessarily trust them as the primary key in a database. If you are going to rely on a JavaScript-generated GUID, I would be tempted to check a register each time a GUID is created to ensure you haven't got a duplicate (an issue that has come up in the Chrome browser in some cases).

I found this https://typescriptbcl.codeplex.com/SourceControl/latest

here is the Guid version they have in case the link does not work later.

module System {
export class Guid {
constructor (public guid: string) {
this._guid = guid;
}


private _guid: string;


public ToString(): string {
return this.guid;
}


// Static member
static MakeNew(): Guid {
var result: string;
var i: string;
var j: number;


result = "";
for (j = 0; j < 32; j++) {
if (j == 8 || j == 12 || j == 16 || j == 20)
result = result + '-';
i = Math.floor(Math.random() * 16).toString(16).toUpperCase();
result = result + i;
}
return new Guid(result);
}
}
}