npm-pd/build/commands/evaluate/utils.js

A beautiful CLI dashboard for NPM publishers

"use strict";

exports.__esModule = true;
exports.normalizeValue = normalizeValue;

var _lodash = require("lodash");

var POSITIVE_INFINITY = Number.POSITIVE_INFINITY,
    isNaN = Number.isNaN;
var abs = Math.abs;

function normalizeValue(value, steps) {
  var index = (0, _lodash.findLastIndex)(steps, function (step) {
    return step.value <= value;
  });

  if (index === -1) {
    return steps[0].norm;
  }

  if (index >= steps.length - 1) {
    return steps[steps.length - 1].norm;
  }

  var stepLow = steps[index];
  var stepHigh = steps[index + 1];
  var normalized = stepLow.norm + (stepHigh.norm - stepLow.norm) * (value - stepLow.value) / (stepHigh.value - stepLow.value);

  if (isNaN(normalized) || abs(normalized) === POSITIVE_INFINITY) {
    throw new Error('Invalid value or steps');
  }

  return normalized;
}