Is there source map support for typescript in node / nodemon?

Question

I have a node project written in typescript@2.

My tsconfig has sourceMap set to true and the *.map.js files are generated. When I

Answer 1

Install source map support:

npm install source-map-support

(I run in in production as well, as it immensely helps finding bugs from the logs of when an error an occurs. I did not experience a large performance impact, yet your experience may be different.)

Add to your tsconfig.json:

{
   "compilerOptions": {
      "sourceMap": true
   }
}

When running your JavaScript file, add the require parameter:

nodemon -r source-map-support/register dist/pathToJson.js

node -r source-map-support/register dist/pathToJson.js

Alternatively, you add in your entry call:

require('source-map-support').install()

yet I find this tedious is projects with multiple entry points.

---

Sidenote: mocha also supports the --require / -r option, so to have the sourcemap support in mocha you can also call your tests with it, e.g. similar to:

NODE_ENV=test npx mocha --forbid-only --require source-map-support/register --exit --recursive ./path/to/your/tests/