Could you explain the distinction between npm install and sudo npm install?

I recently switched to using linux. To install typescript, I ran the following command: npm i typescript Although there were no errors during the installation process, when I checked the version by typing tsc --version, I encountered the error message 

-bash: /usr/bin/tsc: No such file or directory
.

In an attempt to rectify this, I decided to reinstall typescript with elevated permissions using the command sudo npm i -g typescript. This time, the installation was successful and tsc --version provided the expected compiler version number.

My queries are:

  • What distinguishes between npm i typescript and sudo npm i -g typescript?
  • Was anything actually installed with the first command? If so, where was it located? And why did tsc --version fail initially?
  • How does running a command with sudo differ from running it without sudo? When is it advisable to use sudo and when should it be avoided?

Appreciate your insights!

linuxtypescriptubuntunpmsudo

Answer №1

When you use the -g flag with npm, it installs a module globally instead of in your current project. However, this practice is not recommended as it can lead to issues. It's better to utilize npx instead.

After running the initial command, did anything actually get installed? If so, where does it go? And why did "tsc --version" fail?

The package will be stored in the node_modules directory of your current project - a location not included in your $PATH environment variable. Therefore, it's advisable to use npx tsc --version.

sudo is used to run commands as root rather than a regular user. It may be necessary when installing global modules using a system-wide Node.js installation, if the ordinary user lacks write permissions for the system-wide module collection managed by tools like nvm.

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