Telling typescript to to not add ["default'] to new class

Question

TypeScript code

import ModbusRTU from 'modbus-serial';
var modbus = new ModbusRTU();
modbus.connectTCP("192.168.1.5", { port: 502 });
modbus.setID(1);

setInterval(function() {
    modbus.writeRegister(2048, 2);
}, 100);

transpiles to

"use strict";
exports.__esModule = true;
var modbus_serial_1 = require("modbus-serial");
var modbus = new modbus_serial_1["default"](); //  <-- HERE
modbus.connectTCP("192.168.1.5", { port: 502 });
modbus.setID(1);
setInterval(function () {
    modbus.writeRegister(2048, 2);
}, 100);

However, the code only works without the ["default"] in class instantiation - like so

"use strict";
exports.__esModule = true;
var modbus_serial_1 = require("modbus-serial");
var modbus = new modbus_serial_1(); //  <-- HERE
modbus.connectTCP("192.168.1.5", { port: 502 });
modbus.setID(1);
setInterval(function () {
    modbus.writeRegister(2048, 2);
}, 500);

How to tell the transpiler to nod add it to the code?

Your import uses the default import syntax. try `import { ModbusRTU } from 'modbus-serial';` — Titian Cernicova-Dragomir, Jan 08 '19 at 14:29
@TitianCernicova-Dragomir thank you, unfortunately transpiling produces `Module '"./node_modules/modbus-serial"' has no exported member 'ModbusRTU'.` — peter.babic, Jan 08 '19 at 14:32
@TitianCernicova-Dragomir I have tried that as well, this produces `Cannot use 'new' with an expression whose type lacks a call or construct signature.` — peter.babic, Jan 08 '19 at 14:38
I have found out that it tranpiles and works despite the complaints about the `new`, but how to get rid of an error? — peter.babic, Jan 08 '19 at 14:46
@delmadord You could try asserting `var modbus = new ModbusRTU() as any;` — Leo, Jan 08 '19 at 16:26

Coxer · Answer 1 · 2020-02-25T15:33:26.080

2

In case anyone else is running into this problem. It seems like the exports of this library are a bit faulty. I opened an issue here and a pull request to fix it here.

Edit: My patch was applied to this library, hence this issue should not arise in the future :)

edited Feb 25 '20 at 15:33

answered Feb 24 '20 at 22:07

Coxer

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Telling typescript to to not add ["default'] to new class

1 Answers1