pprof-format

A pure JavaScript PProf encoder and decoder library with zero dependencies and
browser support. No protobuf, because the pprof spec only uses a tiny fraction
of the features. Uint8Arrays rather than Node.js buffers so it can work in the
browser. Carefully tuned to be as fast as possible.

Install

``sh
npm install pprof-format
`

Usage

`js
import {
Function,
Label,
Line,
Location,
Mapping,
Profile,
Sample,
ValueType,
StringTable
} from 'pprof-format'

const stringTable = new StringTable()

const periodType = new ValueType({
type: stringTable.dedup('cpu'),
unit: stringTable.dedup('nanoseconds')
})

const fun = new Function({
id: 1,
name: stringTable.dedup('name'),
systemName: stringTable.dedup('system name'),
filename: stringTable.dedup('filename'),
startLine: 123
})

const mapping = new Mapping({
id: 1
})

const location = new Location({
id: 1,
mappingId: mapping.id,
address: 123,
line: [
new Line({
functionId: fun.id,
line: 1234
})
]
})

const profile = new Profile({
sampleType: [
new ValueType({
type: stringTable.dedup('sample'),
unit: stringTable.dedup('count')
}),
periodType
],
sample: [
new Sample({
locationId: [location.id],
value: [123, 456],
label: [
new Label({
key: stringTable.dedup('label key'),
str: stringTable.dedup('label str')
}),
new Label({
key: stringTable.dedup('label key'),
num: 12345,
numUnit: stringTable.dedup('label num unit')
})
]
})
],
mapping: [mapping],
location: [location],
'function': [fun],
stringTable,
timeNanos: BigInt(Date.now()) * 1_000_000n,
durationNanos: 1234,
periodType,
period: 1234 / 2,
comment: [
stringTable.dedup('some comment')
]
})

// Encode to Uint8Array
console.log(profile.encode())

// Decode from Uint8Array
const copied = Profile.decode(profile.encode())

// Should match the structure of the original profile object
console.log(copied)
``