Hardfork.toString

import { Hardfork } from 'tevm'

const merge = Hardfork("merge")
const paris = Hardfork("paris")  // Alias

Hardfork.toString(merge)   // "merge"
Hardfork.toString(paris)   // "merge" (canonical, not "paris")

import { Hardfork } from 'tevm'

function displayHardfork(fork: BrandedHardfork): string {
  const name = Hardfork.toString(fork)
  return name.charAt(0).toUpperCase() + name.slice(1)
}

displayHardfork(CANCUN)  // "Cancun"
displayHardfork(MERGE)   // "Merge"

import { Hardfork } from 'tevm'

function logHardforkInfo(fork: BrandedHardfork) {
  console.log(`Current hardfork: ${Hardfork.toString(fork)}`)
  console.log(`EIP-1559: ${fork.hasEIP1559()}`)
  console.log(`PUSH0: ${fork.hasEIP3855()}`)
  console.log(`Blobs: ${fork.hasEIP4844()}`)
}

import { Hardfork } from 'tevm'

function saveConfig(fork: BrandedHardfork) {
  const config = {
    hardfork: Hardfork.toString(fork),  // Canonical name
    timestamp: Date.now()
  }

  localStorage.setItem("config", JSON.stringify(config))
}

// Load and parse
function loadConfig() {
  const data = JSON.parse(localStorage.getItem("config"))
  return Hardfork(data.hardfork)
}

import { Hardfork } from 'tevm'

function getNetworkInfo(fork: BrandedHardfork) {
  return {
    hardfork: Hardfork.toString(fork),
    consensus: fork.isPostMerge() ? "pos" : "pow",
    features: {
      eip1559: fork.hasEIP1559(),
      push0: fork.hasEIP3855(),
      blobs: fork.hasEIP4844()
    }
  }
}

import { Hardfork } from 'tevm'

const featureMatrix = new Map<string, Features>()

function addHardforkFeatures(fork: BrandedHardfork, features: Features) {
  const key = Hardfork.toString(fork)
  featureMatrix.set(key, features)
}

function getHardforkFeatures(fork: BrandedHardfork): Features | undefined {
  const key = Hardfork.toString(fork)
  return featureMatrix.get(key)
}

"frontier"
"homestead"
"dao"
"tangerinewhistle"
"spuriousdragon"
"byzantium"
"constantinople"
"petersburg"
"istanbul"
"muirglacier"
"berlin"
"london"
"arrowglacier"
"grayglacier"
"merge"
"shanghai"
"cancun"
"prague"
"osaka"

import { Hardfork } from 'tevm'

// Good - normalized
function saveHardfork(fork: BrandedHardfork) {
  const normalized = Hardfork.toString(fork)
  storage.set("hardfork", normalized)  // "merge" not "paris"
}

// Bad - storing alias
function saveHardforkBad(input: string) {
  storage.set("hardfork", input)  // Might be "Paris" or "MERGE"
}

import { Hardfork } from 'tevm'

const fork = Hardfork.fromString("cancun")
const name = Hardfork.toString(fork)
const fork2 = Hardfork.fromString(name)

Hardfork.equals(fork, fork2)  // true - round trip works