NodeJs typescript and module issues

Question

I have a test nodeJS server code in typescript. I get this error when trying to run the ts file:

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

My package.json

{
  "name": "server",
  "version": "1.0.0",
  "description": "server",
  "main": "server.ts",
  "type": "module",
  "scripts": {
    "test": "test server",
    "prebuild": "tslint -c tslint.json -p tsconfig.json --fix",
    "build": "tsc",
    "prestart": "npm run build",
    "start": "node .",
    "tsc": "tsc"
  },
  "author": "HL",
  "license": "ISC",
  "devDependencies": {
    "@types/node": "^14.0.6",
    "tslint": "^6.1.2",
    "typescript": "^3.9.5"
  },
  "dependencies": {
    "@types/express": "^4.17.6",
    "ejs": "^3.1.3",
    "express": "^4.17.1",
    "http": "0.0.1-security",
    "mysql": "^2.18.1",
    "util": "^0.12.3"
  }
}

Note I need to use type: module, because I get an error when I remove it:

SyntaxError: Cannot use import statement outside a module
    at wrapSafe (internal/modules/cjs/loader.js:1067:16)
    at Module._compile (internal/modules/cjs/loader.js:1115:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1171:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47

Please help.

You need to compile it to js, or use ts-node

David
– David

2020-06-06 20:11:56 +00:00
Commented Jun 6, 2020 at 20:11 — David
– David, Commented Jun 6, 2020 at 20:11

user7605594 · Accepted Answer · 2020-06-07 00:00:19Z

1

You need to compile before running with node, or use ts-node to run your typescript. Also, this may be an issue stemming from your tsconfig and imports.

answered Jun 7, 2020 at 0:00

user7605594

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Comments

Elias Schablowski · Accepted Answer · 2020-06-07 04:51:53Z

1

This can come from multiple points (comment if I forgot something since this is a somewhat generic config error):

Change your main to ts-node (as suggested by a different answer) or change the main field in your package.json to <buildFolder (normally diet)>/server.js to reference the built file rather than the typescript file.
Change the module field tsconfig.json to CommonJS to avoid building a ES6 module (this is a problem especially with webpack

answered Jun 7, 2020 at 4:51

Elias Schablowski

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Comments

Ali H. Kudeir · Accepted Answer · 2022-03-25 08:47:01Z

0

After many tries the only way i got my setup to work is as follows:

Remove "type": "module" from package.json
Set "module": "commonjs" inside tsconfig.json
Run your server entry with ts-node ./src/app.ts

answered Mar 25, 2022 at 8:47

Ali H. Kudeir

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Comments

Raghavendra Hn · Accepted Answer · 2022-03-10 12:38:31Z

-1

{
  "name": "project",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build": "tsc",
    "start": "tsc && node ./build/index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@types/cors": "^2.8.12",
    "@types/express": "^4.17.13",
    "bcrypt": "^5.0.1",
    "cors": "^2.8.5",
    "dotenv": "^16.0.0",
    "express": "^4.17.2",
    "moment": "^2.29.1",
    "pg": "^8.7.3",
    "pg-hstore": "^2.3.4",
    "sequelize": "^6.15.1"
  },
  "devDependencies": {
    "@types/bcrypt": "^5.0.0",
    "@types/moment": "^2.13.0",
    "@types/typescript": "^2.0.0",
    "nodemon": "^2.0.15",
    "typescript": "^4.5.5"
  }
}

edited Mar 10, 2022 at 12:38

answered Mar 10, 2022 at 8:10

Raghavendra Hn

11 bronze badge

2 Comments

Nick Vu Over a year ago

You need to format your code and give instruction details.

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

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