long-task-detector

Library that detects and reports long-running CPU tasks in node.

Comes with minimal (~10% CPU) overhead (asynchook + profiler). Tested for memory leaks.

$3

Usage:

``js
var {createDetector} = require('../lib/index')

var cancelDetector = createDetector(function(report) {
console.warn("Task length", report.taskLength)
console.warn("Top 10 items", report.items)
console.warn("Cpu and stack of first item", report.items[0].cpu, report.items[0].stackTrace)
console.warn(report.toString())
// Or send to your favorite alerting service
}, 50)

// cancelDetector() // to stop
`

$3

`
WARNING: Task took 52ms to run!
CPU: 66.7%
at f2 (/Users/spion/Documents/long-task-detector/test/index.js:22)
at f1 (/Users/spion/Documents/long-task-detector/test/index.js:17)
at ? (/Users/spion/Documents/long-task-detector/test/index.js:12)
at args.(anonymous function) (/Users/spion/Documents/long-task-detector/node_modules/async-hook/patches/timers.js:50)
at ontimeout (timers.js:361)
at tryOnTimeout (timers.js:233)
at listOnTimeout (timers.js:161)
at (root) (:0)
CPU: 33.3%
at f3 (/Users/spion/Documents/long-task-detector/test/index.js:26)
at f1 (/Users/spion/Documents/long-task-detector/test/index.js:17)
at ? (/Users/spion/Documents/long-task-detector/test/index.js:12)
at args.(anonymous function) (/Users/spion/Documents/long-task-detector/node_modules/async-hook/patches/timers.js:50)
at ontimeout (timers.js:361)
at tryOnTimeout (timers.js:233)
at listOnTimeout (timers.js:161)
at (root) (:0)
`

$3

`typescript

export declare function createDetector(notifyMe: (report: Report) => void, maxDelta: number): () => void;

export interface Report {
taskLength: number;
items: ReportItem[];
}
export interface ReportItem {
cpu: number;
stackTrace: StackItem[];
}
export interface StackItem {
name: string;
line: number;
url: string;
}
``

$3

ISC