@tgwf/co2/dist/cjs/1byte.js.map

Work out the co2 of your digital services

{
  "version": 3,
  "sources": ["../../src/1byte.js"],
  "sourcesContent": ["// Use the 1byte model for now from the Shift Project, and assume a US grid mix figure they use of around 519 g co2 for the time being. It's lower for Europe, and in particular, France, but for v1, we don't include this\nconst CO2_PER_KWH_IN_DC_GREY = 519;\n\n// this figure is from the IEA's 2018 report for a global average:\nconst CO2_PER_KWH_NETWORK_GREY = 475;\n\n// TODO - these figures need to be updated, as the figures for green\n// shouldn't really be zero now we know that carbon intensity figures\n// for renewables still usually include the life cycle emissions\nconst CO2_PER_KWH_IN_DC_GREEN = 0;\n\n// the 1 byte model gives figures for energy usage for:\n\n// datacentres\n// networks\n// the device used to access a site/app\n\n// The device usage figure combines figures for:\n//  1. the usage for devices (which is small proportion of the energy use)\n//  2. the *making* the device, which is comparatively high.\n\nconst KWH_PER_BYTE_IN_DC = 7.2e-11;\n\n// this is probably best left as something users can define, or\n// a weighted average based on total usage.\n// Using a simple mean for now, as while web traffic to end users might trend\n// towards wifi and mobile,\n// Web traffic between servers is likely wired networks\n\nconst FIXED_NETWORK_WIRED = 4.29e-10;\nconst FIXED_NETWORK_WIFI = 1.52e-10;\nconst FOUR_G_MOBILE = 8.84e-10;\n\n// Pull requests gratefully accepted\nconst KWH_PER_BYTE_FOR_NETWORK =\n  (FIXED_NETWORK_WIRED + FIXED_NETWORK_WIFI + FOUR_G_MOBILE) / 3;\n\nconst KWH_PER_BYTE_FOR_DEVICES = 1.3e-10;\n\nclass OneByte {\n  constructor(options) {\n    this.allowRatings = false;\n    this.options = options;\n\n    this.KWH_PER_BYTE_FOR_NETWORK = KWH_PER_BYTE_FOR_NETWORK;\n  }\n\n  /**\n   * Calculates the carbon footprint of a website using the OneByte model\n   * @param {number} bytes - The number of bytes to calculate the carbon footprint for\n   * @param {boolean} green - Whether the energy is green or not\n   * @returns {number} The carbon footprint in grams of CO2\n   */\n\n  perByte(bytes, green) {\n    if (bytes < 1) {\n      return 0;\n    }\n\n    if (green) {\n      // if we have a green datacentre, use the lower figure for renewable energy\n      const Co2ForDC = bytes * KWH_PER_BYTE_IN_DC * CO2_PER_KWH_IN_DC_GREEN;\n\n      // but for the worest of the internet, we can't easily check, so assume\n      // grey for now\n      const Co2forNetwork =\n        bytes * KWH_PER_BYTE_FOR_NETWORK * CO2_PER_KWH_NETWORK_GREY;\n\n      return Co2ForDC + Co2forNetwork;\n    }\n\n    const KwHPerByte = KWH_PER_BYTE_IN_DC + KWH_PER_BYTE_FOR_NETWORK;\n    return bytes * KwHPerByte * CO2_PER_KWH_IN_DC_GREY;\n  }\n}\n\nexport { OneByte };\nexport default OneByte;\n"],
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