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metrics.ts uses Node's process.hrtime(time) for nano second precision. Public api: startTimer, stopTimer, forEachTimer, clearTimers.
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/** | |
* Metrics uses process.hrtime(time) for nano second precision. | |
* public api: startTimer, stopTimer, forEachTimer, clearTimers, filterTimer | |
*/ | |
import chalk from "chalk"; | |
interface Timer { | |
name: string, | |
precision: number, | |
started: [number, number], | |
elapsed?: string | |
} | |
const timers = new Map(); | |
const startTimer = (name: string, precision = 3) => { | |
const timer: Timer = { | |
name, | |
precision, | |
started: process.hrtime(), | |
}; | |
timers.set(name, timer); | |
}; | |
const noSuchTimer = (name: string) => { | |
console.log(chalk.red(`no such timer named '${name}'`)); | |
}; | |
const stopTimer = (name: string): string | void => { | |
const timer: Timer = timers.get(name); | |
if (!timer) return noSuchTimer(name); | |
const mills = process.hrtime(timer.started)[1] / 1000000; | |
timer.elapsed = process.hrtime(timer.started)[0] + " s, " + mills.toFixed(timer.precision) + " ms"; | |
return timer.elapsed; | |
}; | |
const forEachTimer = (callbackFn: (timer: Timer) => void) => timers.size > 0 && timers.forEach(callbackFn); | |
const filterTimer = (name: string, callbackFn: (timer: Timer) => void) => timers.size > 0 && timers.has(name) && callbackFn(timers.get(name)); | |
const clearTimers = () => timers.clear(); | |
export { | |
startTimer, | |
stopTimer, | |
forEachTimer, | |
filterTimer, | |
clearTimers, | |
}; |
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