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const EE = require('node:events')
const fs = require('node:fs')
const { log, time } = require('proc-log')
const INITIAL_TIMER = 'npm'
class Timers extends EE {
#file
#timing
#unfinished = new Map()
#finished = {}
constructor () {
super()
this.on()
time.start(INITIAL_TIMER)
this.started = this.#unfinished.get(INITIAL_TIMER)
}
on () {
process.on('time', this.#timeHandler)
}
off () {
process.off('time', this.#timeHandler)
}
load ({ path, timing } = {}) {
this.#timing = timing
this.#file = `${path}timing.json`
}
finish (metadata) {
time.end(INITIAL_TIMER)
for (const [name, timer] of this.#unfinished) {
log.silly('unfinished npm timer', name, timer)
}
if (!this.#timing) {
// Not in timing mode, nothing else to do here
return
}
try {
this.#writeFile(metadata)
log.info('timing', `Timing info written to: ${this.#file}`)
} catch (e) {
log.warn('timing', `could not write timing file: ${e}`)
}
}
#writeFile (metadata) {
const globalStart = this.started
const globalEnd = this.#finished[INITIAL_TIMER]
const content = {
metadata,
timers: this.#finished,
// add any unfinished timers with their relative start/end
unfinishedTimers: [...this.#unfinished.entries()].reduce((acc, [name, start]) => {
acc[name] = [start - globalStart, globalEnd - globalStart]
return acc
}, {}),
}
fs.writeFileSync(this.#file, JSON.stringify(content) + '\n')
}
#timeHandler = (level, name) => {
const now = Date.now()
switch (level) {
case time.KEYS.start:
this.#unfinished.set(name, now)
break
case time.KEYS.end: {
if (this.#unfinished.has(name)) {
const ms = now - this.#unfinished.get(name)
this.#finished[name] = ms
this.#unfinished.delete(name)
log.timing(name, `Completed in ${ms}ms`)
} else {
log.silly('timing', `Tried to end timer that doesn't exist: ${name}`)
}
}
}
}
}
module.exports = Timers