TypeScript Compilation Error

[thorny fern]

Trying to setup TS for es6 module. I'm using node version v20.12.1. I've tried switching to different node versions.

I'm just using 1file 1 line, console.log() for initial setup.

Any help is appreciated, many thanks!

[dire cipher]

Do you not know how to use import?

[olive turtle]

!screenshot

[digital night]

`!screenshot`:

Rather than screenshots, please provide either code formatted as:

```ts
// code here
```
Or even better, as an example on the TypeScript playground that is as simple as possible and reproduces the issue. This makes it easier to help you and increases the chances of getting an answer.

[olive turtle]

but we don't really need all of that, showing the part that's actually giving errors would help

[thorny fern]

Yep, but import what?
I've written expressJS code in Es6 module.
Just that I'm trying to add TS to that

[thorny fern]

I'm just using console.log() for now....1 file 1 line.
I messed up my main code so jusr seeing if this works

[olive turtle]

sounds like that's not a valid module then?

could try adding a dummy export {}

[thorny fern]

Still the same error.
I read couple of article that thr node version can be issue, but I've switched to latest one, the prev i was using was v15.
Still the same err for both

[jovial niche]

what does D:\test\app.ts look like? (and as previously suggested: code as text is better than a screenshot)

[thorny fern]

Hey,
Thanks for reaching out.
As said in above comments, I'm just using 1file 1 line console.log for my index.ts as I've messed up my main code

[thorny fern]

Nws, i updated the post, cheers

[jovial niche]

maybe this is a known issue with ts-node-dev: https://github.com/wclr/ts-node-dev/issues/314?

i don't think i've used that package. you could try compiling with tsc and then running via node to see if you get the same issue or not. i know tsx is also popular these days

[thorny fern]

Ah, many thanks for the article, issue looks the exact same....

[sand thistle]

while ts-node is convenient, I'd recommend not to use it for beginners, since it requires quite a bit of prior knowledge about module systems in JS

you need to pass --esm when calling ts-node

you can see in the logs the ts-node loader is cjs, which won't work with es modules

see https://typestrong.org/ts-node/docs/options#esm

also express is a cjs package, so you will need esModuleInterop, but I see you already have it enabled, so that's good

@thorny fern

[thorny fern]

Thanks for the suggestion....I'm self learning so need to start from somewhere right🙃...
I'll checkout the given link, thanks!

[sand thistle]

also you should have "type": "module" in your package.json

for nodejs to start in esm mode

https://typestrong.org/ts-node/docs/options#moduletypes

but tbh, I wouldn't go down that road

👉 it's way easier to just use cjs when getting started @thorny fern

especially if you don't have any specific reason to use esm

[thorny fern]

The cjs one is working fine with ts....thing is I've worked on express on es6, so need to setup ts on es module to setup ts on the main express code

[sand thistle]

so need to setup ts on es module to setup ts on the main express code
wdym?

[thorny fern]

I mean I've given type: module as coz I've written express code on es6.
So I'm not checking out TS in cjs

[sand thistle]

basically

TS code will always use ES modules, by design, it's your only "option"

but when you compile your TS code into JS,
you can chose what module system to use to run the code

now, express uses CJS at runtime

so your emitted JS code should use CJS too

[thorny fern]

Ah i see i see....
But considering that my express is in es6....and if I've type:module defined in package.json the Tas isn't working

I'll prolly check the urls shared above and get better grasp