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const { RequestAbortedError } = require('../core/errors') const kListener = Symbol('kListener') const kSignal = Symbol('kSignal') function abort (self) { if (self.abort) { self.abort() } else { self.onError(new RequestAbortedError()) } } function addSignal (self, signal) { self[kSignal] = null self[kListener] = null if (!signal) { return } if (signal.aborted) { abort(self) return } self[kSignal] = signal self[kListener] = () => { abort(self) } if ('addEventListener' in self[kSignal]) { self[kSignal].addEventListener('abort', self[kListener]) } else { self[kSignal].addListener('abort', self[kListener]) } } function removeSignal (self) { if (!self[kSignal]) { return } if ('removeEventListener' in self[kSignal]) { self[kSignal].removeEventListener('abort', self[kListener]) } else { self[kSignal].removeListener('abort', self[kListener]) } self[kSignal] = null self[kListener] = null } module.exports = { addSignal, removeSignal }