bench.js

'use strict'
const common = require('../common.js');

const bench = common.createBenchmark(main, {
  range: [0x7F, 0x7FF, 0x7FFF],
  size: [1<<14, 1<<16, 1<<20]
});

function main(conf) {
  let arr = new Array(Number(conf.size))
  fillBuffer(Number(conf.range), arr)
  measure(new Buffer(arr))
}

function measure(buf) {
  bench.start()
  let size = buf.stripInvalidUtf8()  // added this – runs Utf8Value::StripInvalidUtf8 on the buffer data
  bench.end(1, buf.slice(0, size).length)
}

function fillBuffer(range, out) {
  for (let i = 0; i < out.length; ++i) {
    out[i] = String.fromCodePoint(i % range)
  }
}