How to use the ethereum-types.SolidityTypes.Uint256 function in ethereum-types

_.forEach(event.inputs, (param: EventParameter, i: number) => {
            // Indexed parameters are stored in topics. Non-indexed ones in decodedData
            let value: BigNumber | string | number = param.indexed ? log.topics[topicsIndex++] : decodedData[i];
            if (_.isUndefined(value)) {
                didFailToDecode = true;
                return;
            }
            if (param.type === SolidityTypes.Address) {
                const baseHex = 16;
                value = addressUtils.padZeros(new BigNumber((value as string).toLowerCase()).toString(baseHex));
            } else if (param.type === SolidityTypes.Uint256 || param.type === SolidityTypes.Uint) {
                value = new BigNumber(value);
            } else if (param.type === SolidityTypes.Uint8) {
                value = new BigNumber(value).toNumber();
            }
            decodedParams[param.name] = value;
        });

_.forEach(event.inputs, (param: EventParameter, i: number) => {
            // Indexed parameters are stored in topics. Non-indexed ones in decodedData
            let value: BigNumber | string | number = param.indexed ? log.topics[topicsIndex++] : decodedData[i];
            if (_.isUndefined(value)) {
                didFailToDecode = true;
                return;
            }
            if (param.type === SolidityTypes.Address) {
                const baseHex = 16;
                value = addressUtils.padZeros(new BigNumber(value).toString(baseHex));
            } else if (param.type === SolidityTypes.Uint256 || param.type === SolidityTypes.Uint) {
                value = new BigNumber(value);
            } else if (param.type === SolidityTypes.Uint8) {
                value = new BigNumber(value).toNumber();
            }
            decodedParams[param.name] = value;
        });