@expo/cli
Version:
72 lines (71 loc) • 2.36 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "installExitHooks", {
enumerable: true,
get: ()=>installExitHooks
});
const _fn = require("./fn");
const debug = require("debug")("expo:utils:exit");
const PRE_EXIT_SIGNALS = [
"SIGHUP",
"SIGINT",
"SIGTERM",
"SIGBREAK"
];
// We create a queue since Node.js throws an error if we try to append too many listeners:
// (node:4405) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGINT listeners added to [process]. Use emitter.setMaxListeners() to increase limit
const queue = [];
let unsubscribe = null;
function installExitHooks(asyncExitHook) {
// We need to instantiate the master listener the first time the queue is used.
if (!queue.length) {
// Track the master listener so we can remove it later.
unsubscribe = attachMasterListener();
}
queue.push(asyncExitHook);
return ()=>{
const index = queue.indexOf(asyncExitHook);
if (index >= 0) {
queue.splice(index, 1);
}
// Clean up the master listener if we don't need it anymore.
if (!queue.length) {
unsubscribe == null ? void 0 : unsubscribe();
}
};
}
// Create a function that runs before the process exits and guards against running multiple times.
function createExitHook(signal) {
return (0, _fn.guardAsync)(async ()=>{
debug(`pre-exit (signal: ${signal}, queue length: ${queue.length})`);
for (const [index, hookAsync] of Object.entries(queue)){
try {
await hookAsync(signal);
} catch (error) {
debug(`Error in exit hook: %O (queue: ${index})`, error);
}
}
var _exitCode;
debug(`post-exit (code: ${(_exitCode = process.exitCode) != null ? _exitCode : 0})`);
process.exit();
});
}
function attachMasterListener() {
const hooks = [];
for (const signal of PRE_EXIT_SIGNALS){
const hook = createExitHook(signal);
hooks.push([
signal,
hook
]);
process.on(signal, hook);
}
return ()=>{
for (const [signal, hook] of hooks){
process.removeListener(signal, hook);
}
};
}
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