@hyperlane-xyz/sdk/dist/utils/decimals.js

The official SDK for the Hyperlane Network

import { assert, objMap } from '@hyperlane-xyz/utils';
export function verifyScale(configMap) {
    const chainDecimalConfigPairs = configMap instanceof Map
        ? Object.fromEntries(configMap.entries())
        : configMap;
    const decimalsByChain = objMap(chainDecimalConfigPairs, (chain, config) => {
        assert(config.decimals, `Decimals must be defined for token config on chain ${chain}`);
        return { decimals: config.decimals, scale: config.scale };
    });
    if (!areDecimalsUniform(decimalsByChain)) {
        const maxDecimals = Math.max(...Object.values(decimalsByChain).map((config) => config.decimals));
        for (const [_, config] of Object.entries(decimalsByChain)) {
            if (config.decimals) {
                const calculatedScale = 10 ** (maxDecimals - config.decimals);
                if ((!config.scale && calculatedScale !== 1) ||
                    (config.scale && calculatedScale !== config.scale)) {
                    return false;
                }
            }
        }
    }
    return true;
}
function areDecimalsUniform(configMap) {
    const values = [...Object.values(configMap)];
    const [first, ...rest] = values;
    for (const d of rest) {
        if (d.decimals !== first.decimals) {
            return false;
        }
    }
    return true;
}
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