How to fix Cannot find module 'typescript' in Angular 4?

I was able to solve this problem by removing node_modules then running npm install

For me just running the below command is not enough (though a valid first step):

npm install -g typescript

The following command is what you need (I think deleting node_modules works too, but the below command is quicker)

npm link typescript

This should do the trick,

npm install -g typescript

If you don't have particular needs, I suggest to install Typescript locally.

npm install --global typescript # Global installation
npm install --save-dev typescript # Local installation

yarn global add typescript # Global installation
yarn add --dev typescript # Local installation

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