What is the importance of having typings when using TypeScript?

I recently came across a post on setting up Material-UI for React with Typescript on Stack Overflow: How to setup Material-UI for React with Typescript?

As someone who is brand new to typescript, I initially assumed that typescript was simply a superset of regular javascript. So, I'm puzzled as to why I need to execute the command: 

typings install dt~material-ui --global --save
in order to use material-ui. Why are my material-ui modules not loading without this step?

ERROR in ./source/scripts/components/app.tsx
(4,20): error TS2307: Cannot find module 'material-ui/AppBar'.

typescripttypescript-typings

Answer №1

Is TypeScript the language of choice for your project? If that's the case and you're incorporating material-ui, it's important to ensure you have installed - or created - type declarations (or typings) for all Javascript libraries being used. This will enable the TypeScript compiler to conduct thorough type checking. I recommend delving into the official TypeScript documentation to familiarize yourself with the process.

It's essential for every module to have its own set of type declarations. In the event that you prefer not to install pre-existing declarations, you have the option to craft your own and employ the any keyword to bypass type checking altogether.

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