22 lines
414 B
TypeScript
22 lines
414 B
TypeScript
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const callbacks = new Set<() => void>()
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let registered = false
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export function beforeExit(fn: () => void): () => void {
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if (!registered) {
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registered = true
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window.addEventListener('beforeunload', () => {
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for (const callback of callbacks) {
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callback()
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}
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})
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}
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callbacks.add(fn)
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return () => {
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callbacks.delete(fn)
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}
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}
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