TypeScript Go support (at least in CLI)

[notramo]

Description

JSX support has been recently implemented in the Go implementation of TypeScript.

The new Go implementation is a lot faster (10 times faster in some projects), and uses ~half the memory as the JS implementation.

It seems that this new version has enough features for a fast CLI svelte-check command. LSP support is lacking at the moment, but an optional svelte-check config option would be really useful.

Proposed solution

Add a command line option to svelte-check that enables the use of tsgo tsc … instead of tsc.

Alternatives

None. This seems a quite simple change, with the most obvious solution being a CLI option. Other solutions seem a lot more complicated.

Additional Information, eg. Screenshots

No response

[jasonlyu123]

No. It's not a simple change. svelte-check does not call tsc by the command. It used low-level typescript API that is about to be rewritten in typescript go. This is definitely on the radar but not anytime soon.