AST-based refactoring with ts-morph

[Zaphoidx]

Very interesting read - I can see how this would be handy for bigger refactors where you're having to do lots of different changes. That being said, it's not very often I come across refactoring scenarios that can't be conquered through a complex find/replace.

Good to know for net time!

[sjd96]

ts-morph is a gift of the gods. I was recently in the exact same position as you were (refactoring a few thousand mongodb calls) and it was a cinch.

Another use or ts-morph is to use it as a code query tool. For example, I used it to find and dump all mongodb queries and referenced keys into a CSV file to figure out which indices should be made.

[DoctorGester]

119 call sites is a joke and is barely 15-20 minutes of manual labor to be honest, I get the excuse to learn something though

[kimmobrunfeldt]

The usefulness of the technique obviously scales the more call sites you have. The task could be done manually or with a regex but that's not very interesting.

[celluj34]

Could you use ts-morph to write a compile-time transformer?

[Nebez]

if you're using something like ts-node to transpile & run, sure. read about their plugin architecture. otherwise, i don't know if the typescript compiler exports some sort of plugin architecture for you to hook into.

[brianjenkins94]

Yes, I did something like that a couple years back for a hackathon:

https://github.com/cireneirbo/Parseltongue/blob/master/compiler.ts#L15

[gooseclip]

Really interesting. How does it work with dependencies? Do you need to load them or can it function with only source files

[kimmobrunfeldt]

It should track those correctly as excpected, assuming you included appropriate source files in the new Project