Discussion on: TypeScript Gotchas

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Pacharapol Withayasakpunt • Mar 14 '20 • Edited

A gotcha I met recently is Browserified TypeScript's private fields aren't private.
- It might be better to prefix with underscore, just like Python.
On publishing a library, source code isn't bundled by default. Have to declaration: true and declarationMap: true in tsconfig.json.

Solution: you should decode anything that you don't know the type of. I recommend bringing in a library like io-ts for the job.

I use runtypes, or just ajv. Is there a benefit to switching to io-ts? Also, learn fp-ts?

Adam Crockett 🌀 • Mar 14 '20

In the first example, it just looks like types need to be declared, turning on strict mode would help as well.

Pacharapol Withayasakpunt • Mar 15 '20

Yes, I am talking from the perspective of Browser's JavaScript console; and non-Node.js developers.

Adam Crockett 🌀 • Mar 15 '20

Sorry I commented in the wrong place haha.

Ed Bentley • Mar 14 '20

Those look like great options too, though I haven't tried them myself. The io-ts API has worked well for me so I've stuck to it. Whether to use fp-ts or not would need another blog post to discuss! Generally I don't let the fp-ts types like Either propagate to the rest of my code, but it's really up to whatever you prefer.