on-process-exit/dist/index.js

Register callbacks to be run on process exit

// event list found here:
// https://stackoverflow.com/questions/40574218/how-to-perform-an-async-operation-on-exit
const events = [
    'beforeExit',
    'uncaughtException',
    'unhandledRejection',
    'SIGHUP',
    'SIGINT',
    'SIGQUIT',
    'SIGILL',
    'SIGTRAP',
    'SIGABRT',
    'SIGBUS',
    'SIGFPE',
    'SIGUSR1',
    'SIGSEGV',
    'SIGUSR2',
    'SIGTERM',
];
// handlers are assigned sequential ids, starting with 1
let lastHandlerId = 0;
const handlers = {};
// once an exit event is received, it is tracked here and further handlers
// registrations are cancelled
let eventReceived;
const runHandlers = (event) => {
    // some exit events are not mutually exclusive
    // avoid multiple runs of the handlers
    if (eventReceived)
        return;
    eventReceived = event;
    for (const handlerId in handlers) {
        try {
            handlers[handlerId](event);
        }
        catch (error) {
            // not much that can be done at this point
        }
    }
};
events.forEach((event) => process.on(event, runHandlers.bind(undefined, event)));
export const registerExitHandler = (callback) => {
    if (eventReceived) {
        callback(eventReceived);
        throw new Error(`Exit already in progress: ${eventReceived}`);
    }
    else {
        const handlerId = ++lastHandlerId;
        handlers[handlerId] = callback;
        return handlerId;
    }
};
export const deregisterExitHandler = (handlerId) => {
    delete handlers[handlerId];
};