ts-node cannot find module typescript

Question

I'm deploying a dockerized typescript app on AWS. When I run the app container I get a ts-node error Error: Cannot find module 'typescript' which is not clear to me because typescript is defined as a devDependency. These are my package.json dependencies

{
 "name": "app-server",
 "version": "0.0.0",
 "description": "description",
 "author": "Marcello Bardus",
 "license": "MIT",
 "scripts": {
   "build": "tsc -p tsconfig.build.json",
   "format": "prettier --write \"src/**/*.ts\"",
   "start": "ts-node -r tsconfig-paths/register src/main.ts",
   "start:dev": "nodemon",
   "start:debug": "nodemon --config nodemon-debug.json",
   "prestart:prod": "rimraf dist && tsc",
   "start:prod": "node dist/main.js",
   "lint": "tslint -p tsconfig.json -c tslint.json",
   "test": "jest",
   "test:watch": "jest --watch",
   "test:cov": "jest --coverage",
   "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
"test:e2e": "jest --config ./test/jest-e2e.json"
 },
 "dependencies": {
   "@nestjs/common": "^5.4.0",
   "@nestjs/core": "^5.4.0",
   "@nestjs/typeorm": "^5.3.0",
   "@types/mongoose": "^5.3.18",
   "elliptic": "^6.4.1",
   "mongoose": "^5.4.14",
   "object-hash": "^1.3.1",
   "pg": "^7.8.0",
   "randomstring": "^1.1.5",
   "reflect-metadata": "^0.1.12",
   "rimraf": "^2.6.2",
   "rxjs": "^6.2.2",
   "sha2": "^1.0.2",
   "typeorm": "^0.2.13",
   "typescript": "^3.0.1"
 },
"devDependencies": {
  "@nestjs/testing": "^5.1.0",
  "@types/express": "^4.16.0",
  "@types/jest": "^23.3.1",
  "@types/node": "^10.7.1",
  "@types/supertest": "^2.0.5",
  "jest": "^23.5.0",
  "nodemon": "^1.18.10",
  "prettier": "^1.14.2",
  "supertest": "^3.1.0",
  "ts-jest": "^23.1.3",
  "ts-loader": "^4.4.2",
  "ts-node": "^7.0.1",
  "tsconfig-paths": "^3.5.0",
  "typescript": "^3.0.1",
  "tslint": "5.11.0"
},
"jest": {
  "moduleFileExtensions": [
    "js",
    "json",
    "ts"
  ],
"rootDir": "src",
"testRegex": ".spec.ts$",
"transform": {
  "^.+\\.(t|j)s$": "ts-jest"
},
"coverageDirectory": "../coverage",
"testEnvironment": "node"
  }
}

And the Dockerfile

FROM node
WORKDIR /usr/src/app

COPY . /usr/src/app

RUN npm install -g ts-node nodemon
RUN npm install
RUN npm install typescript

EXPOSE 8085

CMD ["nodemon", "."]

I suppose that typescript is installed locally once the container has been built but it's not. Thanks in advance

no problem. Can you include the full package.json in your answer? — molamk
– molamk, Commented Feb 26, 2019 at 22:22
ts-node is not really meant for production use. You should transpile your Typescript code into JavaScript, then call node startingPoint.js — molamk
– molamk, Commented Feb 26, 2019 at 22:38
@molamk I agree. In nest.js, you can use npm run start:prod which compiles the typescript and then runs the compiled javascript. — Kim Kern
– Kim Kern, Commented Feb 26, 2019 at 22:47

Ashwin · Accepted Answer · 2020-12-30 14:22:46Z

22

Finally, I got ts-node to work using npx:

Install typescript globally:
```
npm i typescript -g
```
Go to your project directory and link typescript to the project:
```
cd <my-project>

npm link typescript
```
Execute ts-node using npx:
```
npx ts-node <your-ts-script>.ts
```

answered Dec 30, 2020 at 14:22

Ashwin

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Amit Baderia · Accepted Answer · 2021-07-19 02:22:10Z

4

I have installed typescript globally using - npm i typescript -g

Still getting the issue - Error: Cannot find module ‘@types/node/package.json‘

Then this helped me to resolve the issue - sudo npm install -D tslib @types/node

After this, I was able to run my script file using either of these -

npx ts-node <script-file>.ts

OR

ts-node <script-file>.ts

You will get detailed explanation on the official npmjs website - https://www.npmjs.com/package/ts-node

answered Jul 19, 2021 at 2:22

Amit Baderia

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1 Comment

Cody Over a year ago

npm i @types/node did the trick for me :)

Filip Seman · Accepted Answer · 2021-02-03 09:27:09Z

If you plan to use ts-node and nodemon as starting point of your application, then explicitly define them in package.json dependencies.

Then RUN npm install --production

They'll be accesible in node_modules/.bin/

~/foo/node_modules/.bin

> ls
is-ci@    nodetouch@  rc@      ts-node@         ts-node-transpile-only@
nodemon@  nopt@       semver@  ts-node-script@  ts-script@

Then you can run ./node_modules/.bin/nodemon or npx nodemon as your Docker CMD.

npx

Executes either from a local node_modules/.bin, or from a central cache, installing any packages needed in order for to run.

source: npx

Tip to improve your Dockerfile, the right way to cache node_modules.

COPY package*.json /usr/src/app

Note that, rather than copying the entire working directory, we are only copying the package.json file. This allows us to take advantage of cached Docker layers.

Then copy app files

COPY . /usr/src/app

Don't forget .dockerignore node_modules.

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