from–https://www.e-learn.cn/topic/3406167
由 半世苍凉 提交于 2020-02-20 06:22:29
问题

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?

回答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.

回答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": []
}

回答3:

Try this command instead:

mocha –compilers ts:ts-node/register,tsx:ts-node/register
which works for me.

回答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.

回答5:

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

Solution: Following command solves the issue.
npm install ts-node –save-dev

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

回答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.

来源：https://stackoverflow.com/questions/40910864/cannot-find-module-ts-node-register