solana/explorer/src/utils/index.tsx

import React, { ReactNode } from "react";
import BN from "bn.js";
import {
  HumanizeDuration,
  HumanizeDurationLanguage,
} from "humanize-duration-ts";

// Switch to web3 constant when web3 updates superstruct
export const LAMPORTS_PER_SOL = 1000000000;

export const NUM_TICKS_PER_SECOND = 160;
export const DEFAULT_TICKS_PER_SLOT = 64;
export const NUM_SLOTS_PER_SECOND =
  NUM_TICKS_PER_SECOND / DEFAULT_TICKS_PER_SLOT;
export const MS_PER_SLOT = 1000 / NUM_SLOTS_PER_SECOND;

export function assertUnreachable(x: never): never {
  throw new Error("Unreachable!");
}

export function normalizeTokenAmount(
  raw: string | number,
  decimals: number
): number {
  let rawTokens: number;
  if (typeof raw === "string") rawTokens = parseInt(raw);
  else rawTokens = raw;
  return rawTokens / Math.pow(10, decimals);
}

export function lamportsToSol(lamports: number | BN): number {
  if (typeof lamports === "number") {
    return Math.abs(lamports) / LAMPORTS_PER_SOL;
  }

  let signMultiplier = 1;
  if (lamports.isNeg()) {
    signMultiplier = -1;
  }

  const absLamports = lamports.abs();
  const lamportsString = absLamports.toString(10).padStart(10, "0");
  const splitIndex = lamportsString.length - 9;
  const solString =
    lamportsString.slice(0, splitIndex) +
    "." +
    lamportsString.slice(splitIndex);
  return signMultiplier * parseFloat(solString);
}

export function lamportsToSolString(
  lamports: number | BN,
  maximumFractionDigits: number = 9
): ReactNode {
  const sol = lamportsToSol(lamports);
  return (
    <>
      ◎
      <span className="text-monospace">
        {new Intl.NumberFormat("en-US", { maximumFractionDigits }).format(sol)}
      </span>
    </>
  );
}

const HUMANIZER = new HumanizeDuration(new HumanizeDurationLanguage());
HUMANIZER.setOptions({
  language: "short",
  spacer: "",
  delimiter: " ",
  round: true,
  units: ["d", "h", "m", "s"],
  largest: 3,
});
HUMANIZER.addLanguage("short", {
  y: () => "y",
  mo: () => "mo",
  w: () => "w",
  d: () => "d",
  h: () => "h",
  m: () => "m",
  s: () => "s",
  ms: () => "ms",
  decimal: ".",
});

export function slotsToHumanString(
  slots: number,
  slotTime = MS_PER_SLOT
): string {
  return HUMANIZER.humanize(slots * slotTime);
}