/proc/2/root/var/lang/lib/node_modules/npm/node_modules/@npmcli/arborist/lib
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const signals = require('./signals.js') // for testing, expose the process being usedmodule.exports = Object.assign(fn => setup(fn), { process }) // do all of this in a setup function so that we can call it// multiple times for multiple reifies that might be going on.// Otherwise, Arborist.reify() is a global action, which is a// new constraint we'd be adding with this behavior.const setup = fn => { const { process } = module.exports const sigListeners = { loaded: false } const unload = () => { if (!sigListeners.loaded) { return } for (const sig of signals) { try { process.removeListener(sig, sigListeners[sig]) } catch { // ignore errors } } process.removeListener('beforeExit', onBeforeExit) sigListeners.loaded = false } const onBeforeExit = () => { // this trick ensures that we exit with the same signal we caught // Ie, if you press ^C and npm gets a SIGINT, we'll do the rollback // and then exit with a SIGINT signal once we've removed the handler. // The timeout is there because signals are asynchronous, so we need // the process to NOT exit on its own, which means we have to have // something keeping the event loop looping. Hence this hack. unload() process.kill(process.pid, signalReceived) setTimeout(() => {}, 500) } let signalReceived = null const listener = (sig, fn) => () => { signalReceived = sig // if we exit normally, but caught a signal which would have been fatal, // then re-send it once we're done with whatever cleanup we have to do. unload() if (process.listeners(sig).length < 1) { process.once('beforeExit', onBeforeExit) } fn({ signal: sig }) } // do the actual loading here for (const sig of signals) { sigListeners[sig] = listener(sig, fn) const max = process.getMaxListeners() try { // if we call this a bunch of times, avoid triggering the warning const { length } = process.listeners(sig) if (length >= max) { process.setMaxListeners(length + 1) } process.on(sig, sigListeners[sig]) } catch { // ignore errors } } sigListeners.loaded = true return unload}