nx/dist/src/utils/kill-child-on-host-exit.js

The core Nx plugin contains the core functionality of Nx like the project graph, nx commands and task orchestration.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.killChildOnHostExit = killChildOnHostExit;
exports.killTrackedChildren = killTrackedChildren;
const native_1 = require("../native");
// Children spawned by this process that must not outlive it. Plugin workers
// are torn down with `process.exit`, which leaves spawned build tools (gradle,
// maven, ...) orphaned and still holding their project locks.
const trackedChildren = new Set();
let exitHookRegistered = false;
/**
 * Kill `cp` (and its descendants) when this process exits, unless it has
 * already exited on its own.
 */
function killChildOnHostExit(cp) {
    if (!cp.pid)
        return;
    trackedChildren.add(cp.pid);
    const untrack = () => {
        trackedChildren.delete(cp.pid);
        // Whichever fires first, drop both — otherwise the other stays registered
        // on a child that is already gone.
        cp.off('exit', untrack);
        cp.off('error', untrack);
    };
    cp.once('exit', untrack);
    cp.once('error', untrack);
    if (!exitHookRegistered) {
        exitHookRegistered = true;
        process.once('exit', killTrackedChildren);
    }
}
function killTrackedChildren() {
    for (const pid of trackedChildren) {
        try {
            // 'exit' handlers must be synchronous, so no graceful variant here.
            (0, native_1.killProcessTree)(pid, 'SIGTERM');
        }
        catch { }
    }
    trackedChildren.clear();
}