Typescript and Type Definition Gotchas

  1. For JS libraries being consumed in TS, you need to download the type definitions of the JS library else the Intellisense won’t work and TS build will fail.
  2. For NodeJS apps, using require won’t work as TS doesn’t understand it, so you’ll have to install Type Definitions for NodeJS using npm install @types/node -D 
  3. For intellisense to work for third party modules like lodash after having their types installed using npm install @types/lodash -D, use ES 6 import statement instead of require in your TS NodeJS apps
  4. Some libraries like angular and firebase come with the type definitions out of the box, and so for these you don’t need to install @types/<library> to use the library in ts project and to have intellisense working
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