Error: unknown file extension .ts

[Thomas1664]

Expected Behavior

Load typescript files

Actual Behavior

When I try to execute a typescript file I get the following error message:
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /home/$USERNAME/$PATH_TO_DEV_FOLEDER/index.ts
at Loader.defaultGetFormat [as _getFormat] (internal/modules/esm/get_format.js:65:15)
at Loader.getFormat (internal/modules/esm/loader.js:113:42)
at Loader.getModuleJob (internal/modules/esm/loader.js:243:31)
at Loader.import (internal/modules/esm/loader.js:177:17)

Steps to reproduce the problem

launch ts-node index.ts

Minimal reproduction

Specifications

• ts-node version: v8.10.2 (installed global)
• node version: v14.3.0
• TypeScript version:v3.9.3 (installed global)
• tsconfig.json, if you're using one:

{}

• Operating system and version: Windows 10 Version 2004
• If Windows, are you using WSL or WSL2?: Yes, Ubuntu 20.04 LTS in WSL2

[cspotcode]

ESM stuff? You might have better luck on our ESM thread. Or post a complete reproduction so someone else can debug.

[alexcochran]

I'm having the same issue.

λ npx ts-node src/app.ts
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for C:\Users\$USER\$PATH_TO_DEV_FOLDER\src\app.ts
    at Loader.defaultGetFormat [as _getFormat] (internal/modules/esm/get_format.js:65:15)
    at Loader.getFormat (internal/modules/esm/loader.js:113:42)
    at Loader.getModuleJob (internal/modules/esm/loader.js:243:31)
    at Loader.import (internal/modules/esm/loader.js:177:17)

[Aguinaldo-Alberto-Naldo]

Estou tendo o mesmo problema também

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for www\server\src\server.ts at Loader.defaultGetFormat [as _getFormat] (internal/modules/esm/get_format.js:65:15) at Loader.getFormat (internal/modules/esm/loader.js:113:42) at Loader.getModuleJob (internal/modules/esm/loader.js:243:31) at Loader.import (internal/modules/esm/loader.js:177:17)

[cspotcode]

My earlier suggestion should point you in the right direction.

…

On Sun, Jun 21, 2020, 9:44 AM AguinaldoAlberto ***@***.***> wrote: Estou tendo o mesmo problema também TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for www\server\src\server.ts at Loader.defaultGetFormat [as _getFormat] (internal/modules/esm/get_format.js:65:15) at Loader.getFormat (internal/modules/esm/loader.js:113:42) at Loader.getModuleJob (internal/modules/esm/loader.js:243:31) at Loader.import (internal/modules/esm/loader.js:177:17) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1062 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAC35OCO5M3WUUNXSLA4YS3RXYFCVANCNFSM4NOUHHYQ> .

[clinkadink]

Remove "type": "module" from package.json

[SaintPhill]

Remove "type": "module" from package.json

If remove module type, you cannot use imports in your .ts files

[Thomas1664]

I must disagree. In Angular projects, there is no "type": "module" in package.json and import synthax works fine. Try to set "module": "es2020" in tsconfig.json

[SaintPhill]

I must disagree. In Angular projects, there is no "type": "module" in package.json and import synthax works fine. Try to set "module": "es2020" in tsconfig.json

nope, same problem with import.
"Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension."

[Thomas1664]

I created a template repo which can be used by anyone who has trouble initializing ts-node.

[cspotcode]

Closing as this is not a ts-node bug. If you want to use node's native ESM support, which is currently experimental, then you can use ts-node's experimental ESM loader hook. See #1007 for details.

[paxperscientiam]

@clinkadink thanks, that did it for me