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Use crypto.randomUUID() to generate a UUID v4. It works in Bun, Node.js, and browsers, with no dependencies. 
crypto.randomUUID();
// => "123e4567-e89b-42d3-a456-426614174000"
Bun also provides Bun.randomUUIDv7(), which generates a UUID v7. 
Bun.randomUUIDv7();
// => "0196a000-bb12-7000-905e-8039f5d5b206"
See Utils.