Error: unknown file extension .ts #1062

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1. Thomas1664

   changed the title [-]Error: unknown file extension.ts[/-] on May 30, 2020
2. cspotcode commented on Jun 2, 2020

   

   cspotcode

   on Jun 2, 2020

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

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3. cspotcode

   added

   needs more info

   on Jun 2, 2020
4. ascochran commented on Jun 6, 2020

   

   ascochran

   on Jun 6, 2020

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   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)
   

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5. Aguinaldo-Alberto-Naldo commented on Jun 21, 2020

   

   Aguinaldo-Alberto-Naldo

   on Jun 21, 2020

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   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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6. cspotcode commented on Jun 21, 2020

   

   cspotcode

   on Jun 21, 2020 via email

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   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> .

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7. clinkadink commented on Jun 28, 2020

   

   clinkadink

   on Jun 28, 2020

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

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8. SaintPhill commented on Jul 16, 2020

   

   SaintPhill

   on Jul 16, 2020

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

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

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9. Thomas1664 commented on Jul 16, 2020

   

   Thomas1664

   on Jul 16, 2020

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   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

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10. SaintPhill commented on Jul 16, 2020

    

    SaintPhill

    on Jul 16, 2020

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    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."

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11. Thomas1664 commented on Jul 17, 2020

    

    Thomas1664

    on Jul 17, 2020

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

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12. cspotcode commented on Jul 29, 2020

    

    cspotcode

    on Jul 29, 2020

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    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.

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13. cspotcode

    closed this as completedon Jul 29, 2020
14. paxperscientiam commented on Dec 10, 2020

    

    paxperscientiam

    on Dec 10, 2020

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    @clinkadink thanks, that did it for me

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15. cspotcode

    removed

    needs more info

    on Dec 10, 2020
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19. hellznrg commented on Jun 4, 2024

    

    hellznrg

    on Jun 4, 2024

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    I got this same error (Unknown file extension ".ts"), trying to run a typescript script with ts-node 10.9.1 and Node 20.10. I couldn't find a solution unfortunately (I tried "esModuleInterop": true in tsconfig), but running the script through tsx worked, so I ended up migrating from ts-node to tsx.

    I find it really odd that .ts files are not recognised by default. Surely ts-node should know how to handle .ts files?

    Switching to tsx was the only thing that worked for me. Now it's as simple as yarn tsx . and BOOM. Not sure what the problem with ts-node is. It's defintely a ts-node problem.

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