Ts-node: 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 [e-mail]
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)

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[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

[cspotcode]

We've enabled the discussion forum for questions like this one.

https://github.com/TypeStrong/ts-node/discussions

We're trying to keep the issue tracker limited to actionable tasks, so contributors can focus on making fixes and improvements to ts-node.

Since this is not a bug and nothing needs to change in ts-node, it's not actionable, so it was closed. Discussions, on the other hand, are the perfect place to ask advice, share guides, and help with project configuration.

Another good thing about the discussion forum: you don't need to fill out an issue template.

[a-h]

This stack overflow answer helped me: https://stackoverflow.com/questions/63445821/ts-node-execute-typescript-with-module-import-and-module-defined

Updating my tsconfig.json to migrate from "module": "es6" to "module": "commonjs" allowed me to run my TypeScript file.

[kseebrinegar]

@a-h Thank you bro! you the man!

[buzuosheng]

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

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

I'm having the same issue. how to fix, thx

[itcat99]

This stack overflow answer helped me: https://stackoverflow.com/questions/63445821/ts-node-execute-typescript-with-module-import-and-module-defined

Updating my tsconfig.json to migrate from "module": "es6" to "module": "commonjs" allowed me to run my TypeScript file.

Thanks! it's useful.

[Rollingegg]

From #1007, use node --loader ts-node/esm ./my-script.ts if your tsconfig.json contains "module": "commonjs"