TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" | TypeScript Community | Page 1

mossy thunder Jul 4, 2023, 11:43 AM

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I'm getting the TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" error when i run my project.

I believe i configured my tsconfig.json correctly and i've been searching for hours but can't find a solution that works

tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig to read more about this file */

    "target": "ES2022",
    "module": "ES2022",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true,
    "moduleResolution": "NodeNext" ,
    "noEmit": true,
    "allowImportingTsExtensions": true,
  },
  "ts-node": {
    "esm": true
  }
}

package.json

{
  "main": "src/index.ts",
  "type": "module",
  "scripts": {
    "dev": "nodemon src/index.ts"
  },
  "dependencies": {
    ...
  },
  "devDependencies": {
    "@types/node": "^20.3.3",
    "ts-node": "^10.9.1"
  },
  "overrides": {
    "semver": "7.5.2"
  }
}

run command npx ts-node src/index.ts

neat parrot Jul 4, 2023, 11:45 AM

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node can't run .ts files and will error with that message, both your main entry and your dev script are using node (unless you have nodemon configured). are you sure you're using ts-node when you get that error?

mossy thunder Jul 4, 2023, 11:46 AM

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neat parrot node can't run `.ts` files and will error with that message, both your `main` en...

yes i was not using npm scripts

neat parrot Jul 4, 2023, 11:46 AM

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how did you run your code?

mossy thunder Jul 4, 2023, 11:47 AM

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neat parrot Jul 4, 2023, 11:47 AM

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please copy the command directly from your terminal rather than retyping it

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the command you showed will error with something different

mossy thunder Jul 4, 2023, 11:48 AM

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neat parrot please copy the command directly from your terminal rather than retyping it

npx ts-node src/index.ts
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for path\src\index.ts

mossy thunder Jul 4, 2023, 11:48 AM

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neat parrot the command you showed will error with something different

wdym with something different

neat parrot Jul 4, 2023, 11:49 AM

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you typed index.s there

mossy thunder Jul 4, 2023, 11:49 AM

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ah my bad but it wasn't the command i ran in the terminal anyway

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i just retyped it and make a mistake

neat parrot Jul 4, 2023, 11:49 AM

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ah you're probably importing .ts files, forgot that was a thing

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you need to be importing .js in your code

mossy thunder Jul 4, 2023, 11:50 AM

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neat parrot you need to be importing `.js` in your code

but i'm not transpiling the code to js

neat parrot Jul 4, 2023, 11:50 AM

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you are

mossy thunder Jul 4, 2023, 11:50 AM

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like it isn't creating the build folder

neat parrot Jul 4, 2023, 11:50 AM

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ts-node does the transpilation, hidden away

mossy thunder Jul 4, 2023, 11:50 AM

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ah

neat parrot Jul 4, 2023, 11:50 AM

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mossy thunder like it isn't creating the build folder

it is, you just can't see it

mossy thunder Jul 4, 2023, 11:50 AM

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didn't know

neat parrot Jul 4, 2023, 11:51 AM

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node just cannot run ts

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ts-node is a layer between ts and node, it's not its own runtime

mossy thunder Jul 4, 2023, 11:51 AM

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so when i run the command do i type index.ts or index.js?

neat parrot Jul 4, 2023, 11:51 AM

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runtimes like deno that can run typescript natively could truly not have the build step, but that isn't the case for node

neat parrot Jul 4, 2023, 11:51 AM

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mossy thunder so when i run the command do i type index.ts or index.js?

index.ts, that tells ts-node what to do

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but in the source code, you need to be importing using .js rather than .ts

mossy thunder Jul 4, 2023, 11:52 AM

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index.ts is the entry point of the project

neat parrot Jul 4, 2023, 11:52 AM

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since that's the job of the runtime, so node handles that
ts-node doesn't rewrite the imports from .ts to .js

true pier Jul 4, 2023, 11:52 AM

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neat parrot runtimes like deno that can run typescript natively could truly not have the bui...

they theoretically could

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but realistically, not without patching v8

mossy thunder Jul 4, 2023, 11:52 AM

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An import path can only end with a '.ts' extension when 'allowImportingTsExtensions' is enabled.

true pier Jul 4, 2023, 11:53 AM

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import from .js instead

mossy thunder Jul 4, 2023, 11:53 AM

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true pier import from .js instead

that's what i did

neat parrot Jul 4, 2023, 11:54 AM

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- import { stuff } from "./otherfile.ts";
+ import { stuff } from "./otherfile.js";

mossy thunder Jul 4, 2023, 11:54 AM

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i did that

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neat parrot Jul 4, 2023, 11:54 AM

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mossy thunder `An import path can only end with a '.ts' extension when 'allowImportingTsExtens...

is a location given for this error

mossy thunder Jul 4, 2023, 11:55 AM

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neat parrot is a location given for this error

it gave that error because tsconfig.json had allowImportingTsExtensions": true

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setting it to false solved it

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but it still says unknown file type .ts

neat parrot Jul 4, 2023, 11:56 AM

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check the lines it points to

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you might not have changed all the imports

mossy thunder Jul 4, 2023, 11:56 AM

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there are no imports using .ts

mossy thunder Jul 4, 2023, 11:57 AM

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neat parrot check the lines it points to

but anyways the error points to the src/index.ts file

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which has no .ts imports

neat parrot Jul 4, 2023, 11:58 AM

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check the line it points to

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also make sure you've saved your files

mossy thunder Jul 4, 2023, 11:58 AM

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might it be that there is a dynamic import that reads files from the directory

mossy thunder Jul 4, 2023, 11:58 AM

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neat parrot also make sure you've saved your files

they're auto saved

neat parrot Jul 4, 2023, 11:58 AM

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neat parrot check the line it points to

doing this would tell you if that's the case

mossy thunder Jul 4, 2023, 11:58 AM

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neat parrot doing this would tell you if that's the case

what lines

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wdym

neat parrot Jul 4, 2023, 11:59 AM

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errors give you the line that they occured on

mossy thunder Jul 4, 2023, 11:59 AM

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yea

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it's the path to the src/index.ts

neat parrot Jul 4, 2023, 11:59 AM

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that's the file

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the error tells you what line in the file errored

mossy thunder Jul 4, 2023, 12:00 PM

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TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for C:\Users\user\Desktop\Development\folder\Bot v2\src\index.ts
    at new NodeError (node:internal/errors:405:5)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:99:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:142:36)
    at defaultLoad (node:internal/modules/esm/load:86:20)
    at nextLoad (node:internal/modules/esm/hooks:726:28)
    at load (C:\Users\user\Desktop\Development\folder\Bot v2\node_modules\ts-node\dist\child\child-loader.js:19:122)
    at nextLoad (node:internal/modules/esm/hooks:726:28)
    at Hooks.load (node:internal/modules/esm/hooks:370:26)
    at MessagePort.handleMessage (node:internal/modules/esm/worker:168:24)
    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:762:20) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

mossy thunder Jul 4, 2023, 12:01 PM

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neat parrot the error tells you what line in the file errored

do you mean this? ^

true pier Jul 4, 2023, 12:01 PM

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wait are you still trying to run a ts file

neat parrot Jul 4, 2023, 12:01 PM

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oh damn yeah

mossy thunder Jul 4, 2023, 12:01 PM

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true pier wait are you still trying to run a ts file

if i try to run src/index.js it says module not found

neat parrot Jul 4, 2023, 12:02 PM

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and you're running this via...?

mossy thunder Jul 4, 2023, 12:02 PM

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npx ts-node src/index.ts

neat parrot Jul 4, 2023, 12:02 PM

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odd, it should resolve that...

mossy thunder Jul 4, 2023, 12:03 PM

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yea i have been stuck on this for hours

true pier Jul 4, 2023, 12:04 PM

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nods version might be too new possibly

mossy thunder Jul 4, 2023, 12:04 PM

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true pier nods version might be too new possibly

20.3.1

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should i try with 18.16.1 which is lts

true pier Jul 4, 2023, 12:07 PM

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yeah

mossy thunder Jul 4, 2023, 12:07 PM

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ok give me a second

mossy thunder Jul 4, 2023, 12:15 PM

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true pier nods version might be too new possibly

it appears that was the problem

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now it doesn't give the unknown extension error anymore

true pier Jul 4, 2023, 12:18 PM

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mossy thunder it appears that was the problem

yeah i have been hearing about issues with new node

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itll definitely get fixed eventually

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no clue when though

mossy thunder Jul 4, 2023, 12:20 PM

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true pier yeah i have been hearing about issues with new node

yea i didn't and i would've never thought it could've been a node version issue

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just that now something don't work anymore

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__dirname is not defined

true pier Jul 4, 2023, 12:21 PM

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wait wtf

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npm i @types/node i guess

mossy thunder Jul 4, 2023, 12:22 PM

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it appears it's not defined in es6 syntax

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it only works with cjs

neat parrot Jul 4, 2023, 12:28 PM

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yes

true pier Jul 4, 2023, 12:33 PM

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all ts is es6 syntax

#TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"