20 lines
726 B
JavaScript
20 lines
726 B
JavaScript
export default function once(emitter, name, { signal } = {}) {
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return new Promise((resolve, reject) => {
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function cleanup() {
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signal === null || signal === void 0 ? void 0 : signal.removeEventListener('abort', cleanup);
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emitter.removeListener(name, onEvent);
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emitter.removeListener('error', onError);
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}
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function onEvent(...args) {
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cleanup();
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resolve(args);
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}
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function onError(err) {
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cleanup();
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reject(err);
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}
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signal === null || signal === void 0 ? void 0 : signal.addEventListener('abort', cleanup);
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emitter.on(name, onEvent);
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emitter.on('error', onError);
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});
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} |