nyastodon/app/javascript/mastodon/uuid.ts

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TypeScript
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export function uuid(a?: string): string {
return a
? (
(a as unknown as number) ^
((Math.random() * 16) >> ((a as unknown as number) / 4))
).toString(16)
: ('' + 1e7 + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, uuid);
}