Module build failed: Error: Cannot find module 'typescript' -- Missing dependency in package.json?

[alshain]

Description

After upgrading react-scripts-ts with npm install -D react-scripts-ts@2.4.0 from 2.2.0, I get an error when compiling using npm start

Expected behavior

I expect things to work :)

Actual behavior

I get Module build failed: Error: Cannot find module 'typescript'

Environment

Run these commands in the project folder and fill in their results:

1. npm ls react-scripts-ts (if you haven’t ejected):

`-- react-scripts-ts@2.4.0

2. node -v: v7.7.4
3. npm -v: 5.3.0

Then, specify:

1. Operating system: Win 7 x86
2. Browser and version: irrelevant

Suspected cause and how I fixed it:

Eventually, I fixed it by installing the typescript module locally.

I initialized a new sample project with create-react-app. I noticed that it contained a locally installed typescript module. However, said module was not listed in the freshly generated package.json.

After running npm install -S typescript, things started working again.

Related: #106 but deleting node_modules and re-running npm install didn't fix things for me. Having typescript installed globally didn't help either.

[wmonk]

As this issue hasn't been updated for a while, I am going to close it. If there are any updates feel free to re-open and comment. 👍

[alshain]

Well, I was waiting for feedback from you, what updates did you expect? Is it correct that the generated package.json shouldn't contain a typescript dependency?

[nhustak]

Just wanted to add something I figured out on this issue. I was experiencing it suddenly on Angular 5 app that had been working. Lot of trial and error...it turns out that it was not happy I had a camel case ts file (vProperty.ts) OR that the add on I was using like to do a './../..' instead of '../..'. for the import Changing both of these and the problem went away.

However what is really strange...I still have a LOT of instances of this (which I am in the process of refactoring..that still work.