Property ‘hot’ does not exist on type ‘NodeModule’.ts(2339)

This code is related to Webpack’s hot module replacement feature (HMR). module.hot works like this:

module.hot.accept(
  dependencies, // Either a string or an array of strings
  callback // Function to fire when the dependencies are updated
);

So the code you included does this: *when the code of ./dashApp.js or one of the module it requires/imports in the requirement/import tree gets updated, re-render the whole React app.

The hot property on node modules it not standard, thus the TS error – make sure you install the required type definitions! npm install --save-dev @types/webpack-env should do the trick.

Related reads:

• Hot Module Replacement concept: high-level Webpack doc on HMR
• Hot Module Replacement API low-level Webpack doc on HMR, explaining how to use it and how does module.hot.accept does
• Property ‘hot’ does not exist on type ‘NodeModule’: Github issue resolving the TS error