@melonproject/token-math/price/normalize.js

A small helper library to do precision safe calculations

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const appendDecimals_1 = __importDefault(require("../token/appendDecimals"));
const createQuantity_1 = __importDefault(require("../quantity/createQuantity"));
const divide_1 = __importDefault(require("../bigInteger/divide"));
const multiply_1 = __importDefault(require("../bigInteger/multiply"));
const power_1 = __importDefault(require("../bigInteger/power"));
const toBI_1 = __importDefault(require("../bigInteger/toBI"));
/**
 * Takes a price and normalizes it:
 * Brings the base quantity to 1.0 and changes the quote value accordingly.
 *
 * Warning: This is a destructive operation (?).
 *
 * Example: For a token with 4 decimals the normalized base quantity is:
 * 10000
 */
const normalize = (price) => {
    const base = createQuantity_1.default(price.base.token, 1);
    const decimalsDifference = price.base.token.decimals - price.quote.token.decimals;
    const quoteQuantityIgnoreDecimals = divide_1.default(multiply_1.default(appendDecimals_1.default(price.quote.token, 1), price.quote.quantity, 
    // Add the sum of quote + base decimals to prevent loss of information during division
    power_1.default(toBI_1.default(10), toBI_1.default(price.quote.token.decimals + price.base.token.decimals))), price.base.quantity);
    const decimalsDifferenceFactor = power_1.default(toBI_1.default(10), toBI_1.default(decimalsDifference));
    const withDecimalsCleaned = divide_1.default(decimalsDifference >= 0
        ? multiply_1.default(quoteQuantityIgnoreDecimals, decimalsDifferenceFactor)
        : divide_1.default(quoteQuantityIgnoreDecimals, decimalsDifferenceFactor), power_1.default(toBI_1.default(10), toBI_1.default(price.quote.token.decimals + price.base.token.decimals)));
    const quote = createQuantity_1.default(price.quote.token, withDecimalsCleaned);
    return {
        base,
        quote
    };
};
exports.default = normalize;