找不到模块“ts-node/register”

Question

I want to use mocha to test my TypeScript/Angular2 project. I tried to use ts-node as described here :

npm install -g ts-node

but when running

mocha --require ts-node/register -t 10000 ./**/*.unit.ts

I get an error

Cannot find module 'ts-node/register'

What am I missing here?

Answer 1

Since the answer that works for a lot of people appears to be hidden in the comments, I'll post it as an actual answer to the question, now that it appears the question has been reopened.

I had this problem as well. Not sure why this Q has been closed. but installing ts-node locally fixes this. npm install ts-node --save-dev

Thanks @Anita, as this was the answer that worked for me too.

Answer 2

Wow, a silly mistake can cost you time. I was facing the same issue when I was trying to debug my nodejs application. The mistake I had done was that I have created my .vscode folder outside of my nodejs app folder(the directory which had node_modules in it). When I moved my .vscode to that folder, everything work fine. Below is my launch.json file.

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "index",         
            "args": [
                "src/index.ts"
            ],
            "runtimeArgs": [
                "-r",
                "ts-node/register"
            ],
            "cwd": "${workspaceFolder}",
            "protocol": "inspector",
            "internalConsoleOptions": "openOnSessionStart"           
        }
    ],
    "compounds": []
}

Answer 3

Try this command instead:

mocha --compilers ts:ts-node/register,tsx:ts-node/register

which works for me.

Answer 4

I know this is kind of old, but I ran into this too and wanted to offer the solution I'm currently using.

I installed ts-node globally using sudo npm i -g ts-node . To make this work with mocha, I just had to give mocha the absolute path to the module, like this:

mocha -r /usr/lib/node_modules/ts-node/register test/*Test.ts

Hope that helps someone else.

Answer 5

Error: module.js:328 throw err; Error: Cannot find module 'ts-node'

Solution: Following command solves the issue.

(Installs ts-node as a development dependency for your project)

Answer 6

I have mocha and ts-node installed as dev dependencies in my package. I'm also using pnpm. I originally had a script for test that was defined as:

pnpx mocha -r ts-node/register '*.test.ts'

When this stopped working with the same error as reported in this question I fixed it by making the -r path explicit:

pnpx mocha -r ./node_modules/ts-node/register '*.test.ts'

I'm still confused as to why the original version stopped working.

Answer 7

Assuming you rather not install ts-node locally and would prefer to use the globally installed node_module. The following examples show what to do for Windows and assumes you're using NVM. If not using NVM, replace NVM_SYMLINK with C:\Program Files\nodejs

Example for command line:

node -r "%NVM_SYMLINK%\node_modules\ts-node\register" script.ts arg1 arg2

Example for bash:

node -r "$NVM_SYMLINK/node_modules/ts-node/register" script.ts arg1 arg2

Example for vscode launch.config

  "configurations": [
    {
      "name": "utils/roll_browser",
      "type": "node",
      "request": "launch",
      "runtimeArgs": [
        "-r",
        /* Slower startup. Runs full typescript validation */
        // "${env:NVM_SYMLINK}/node_modules/ts-node/register"
        /* Faster startup. Doesn't check types or verify the code is valid */
        "${env:NVM_SYMLINK}/node_modules/ts-node/register/transpile-only"
      ],
      "args": ["${workspaceFolder}/utils/roll_browser.ts", "chromium", "756141"],
    },
  ]

Answer 8

I have the same issue while using "jasmine-unit-test-generator". I fix it by runing npm link ts-node . you can refer to https://github.com/TypeStrong/ts-node/issues/565

Answer 9

Use /node_modules/ts-node/register in place of ts-node/register . So in your case it'll become:

mocha --require /node_modules/ts-node/register -t 10000 ./**/*.unit.ts

and make sure ts-node is installed locally in your project like:

npm install ts-node @types/node typescript

This solution doesn't need you to install ts-node globally. And it works cross platform and for everyone.

Answer 10

I know that I'm late but I had the same problem today You have to give to the --require flag an absolute path. I had the same error and I solved It by going from this:

"script":{
 .....
 "test":"env TS_NODE_COMPILER_OPTIONS='{\"module\": \"commonjs\" }' mocha --require /node_modules/ts-node/register 'test/**/*.ts'"
 }

To this with a relative path for the flag:

"script":{
 .....
 "test":"env TS_NODE_COMPILER_OPTIONS='{\"module\": \"commonjs\" }' mocha --require ./node_modules/ts-node/register 'test/**/*.ts'"
 }

The key thing is the dot in the ./node_modules . Of course you have to have your module installed locally or globally installed and linked to the node project

Answer 11

If you don't want to use the local version of ts-node (the one being used by your project), and instead want to use the global version of ts-node you installed, you can do this...

which ts-node # to find the path for the global ts-node

{
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "request": "launch",
      "name": "ts-node",
      "type": "node",
      "program": "THE_PATH_YOU_GOT_FROM_THE_WHICH_CMD",
      "args": [
        "${relativeFile}"
      ],
      "cwd": "${workspaceRoot}",
      "internalConsoleOptions": "openOnSessionStart"
    }  
  ]
}

You don't need to use the node -r runtime argument if you're using your global installation of ts-node.