Ts-migrate: tool to automatically migrate JavaScript projects to TS

#1

Post by Rudeg » Tue, Aug 18, 2020, 9:44 PM UTC

Ts-migrate: tool to automatically migrate JavaScript projects to TS
github.com

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#2

Post by Vanit » Wed, Aug 19, 2020, 3:31 AM UTC

I feel like this should be linking to the associated blog post that actually explains what we're looking at.

https://medium.com/airbnb-engineering/ts-migrate-a-tool-for-...

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#3

Post by coding123 » Wed, Aug 19, 2020, 3:45 AM UTC

I thought the tool to automatically migrate JS to TS was tsc --init and then set the flag to include js files.

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#4

Post by seattle_spring » Wed, Aug 19, 2020, 3:49 AM UTC

coding123 wrote: post #3

I thought the tool to automatically migrate JS to TS was tsc --init and then set the flag to include js files.

This tool actually converts JS files to valid TS files with strict typing, attempting to add types to everything it can and adding placeholder types where it can't.

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#5

Post by hartror » Wed, Aug 19, 2020, 4:33 AM UTC

We just finished our TS migration, I wonder if this would have helped.

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#6

Post by asutekku » Wed, Aug 19, 2020, 5:50 AM UTC

coding123 wrote: post #3

I thought the tool to automatically migrate JS to TS was tsc --init and then set the flag to include js files.

That’s just running js files within ts files. Nothing to really do with migrating, unless you’re writing everything by hand and want everything to work while you’re at it.

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#7

Post by Lammy » Wed, Aug 19, 2020, 6:08 AM UTC

To save any fellow non-webdevs ten seconds, TS == TypeScript

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#8

Post by nojvek » Wed, Aug 19, 2020, 6:23 AM UTC

If I understand correctly, they convert the js file to .ts file, ask tsc for error diagnostics and automatically apply transformations to resolve those errors when they can.

Yep that’s how I’d do it too. I wrote a simpler version when doing a tsc upgrade to resolve a whole bunch of errors. It parses the tsc errors and does simple string replaces.

Has anyone played with the tool to report how good it is?

I remember v8 did an experiment back in the day where it would run code and profile the input parameters and output of functions and automatically generate typescript types.

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#9

Post by triyambakam » Wed, Aug 19, 2020, 6:35 AM UTC

nojvek wrote: post #8

If I understand correctly, they convert the js file to .ts file, ask tsc for error diagnostics and automatically apply transformations to resolve those errors when they can. Yep that’s how I’d do it too. I wrote a simpler version when doing a tsc upgrade to resolve a whole bunch of errors. It parses the tsc errors and does simple string replaces. Has anyone played with the tool to report how good it is? I remember v8…

I hadn't heard of that, but there is the typewiz project - https://github.com/urish/typewiz

Re: Ts-migrate: tool to automatically migrate JavaScript projects to TS

#10

Post by goofballlogic » Wed, Aug 19, 2020, 7:02 AM UTC

It would be nice if we somehow had one to convert typescript back into _idiomatic_ JavaScript.