How to use @ethersproject/constants - 4 common examples

return resolveAddresses(contract.signer || contract.provider, params, method.inputs).then(function (params) {
            tx.data = contract.interface.encodeFunctionData(method, params);
            if (method.constant || options.callStatic) {
                // Call (constant functions) always cost 0 ether
                if (options.estimate) {
                    return Promise.resolve(constants_1.Zero);
                }
                if (!contract.provider && !contract.signer) {
                    logger.throwError("call (constant functions) require a provider or signer", logger_1.Logger.errors.UNSUPPORTED_OPERATION, { operation: "call" });
                }
                // Check overrides make sense
                ["gasLimit", "gasPrice", "value"].forEach(function (key) {
                    if (tx[key] != null) {
                        throw new Error("call cannot override " + key);
                    }
                });
                if (options.transaction) {
                    return properties_1.resolveProperties(tx);
                }
                return (contract.signer || contract.provider).call(tx, blockTag).then(function (value) {
                    try {
                        var result = contract.interface.decodeFunctionResult(method, value);

function formatBytes32String(text) {
    // Get the bytes
    var bytes = utf8_1.toUtf8Bytes(text);
    // Check we have room for null-termination
    if (bytes.length > 31) {
        throw new Error("bytes32 string must be less than 32 bytes");
    }
    // Zero-pad (implicitly null-terminates)
    return bytes_1.hexlify(bytes_1.concat([bytes, constants_1.HashZero]).slice(0, 32));
}
exports.formatBytes32String = formatBytes32String;

function handleNumber(value) {
    if (value === "0x") {
        return constants_1.Zero;
    }
    return bignumber_1.BigNumber.from(value);
}
var transactionFields = [

Formatter.prototype.callAddress = function (value) {
        if (!bytes_1.isHexString(value, 32)) {
            return null;
        }
        var address = address_1.getAddress(bytes_1.hexDataSlice(value, 12));
        return (address === constants_1.AddressZero) ? null : address;
    };
    Formatter.prototype.contractAddress = function (value) {