TypeScript Support

[Swatinem]

So this will be used for the codegen in svelte soon, and the generated code quality looks promising :-)

I am having a look at https://graphql-code-generator.com/ which primarily outputs TS code and the codegen code itself looks quite horrible. My own https://github.com/eversport/intl-codegen outputting both JS and TS separately also is not that pretty.

So anyway, what I wanted to ask is: Is TS support possible with the architecture? Is it planned? Would be really awesome if I could use the same convenience to generate type annotations, and interface declarations, etc…

[Rich-Harris]

Ha, interesting — the code generation is one of the things I plan to change! It's using astring at the moment, which is excellent, but there are a few things I'd like to do slightly differently in the name of readability (collapsing objects and arrays onto a single line where appropriate, adding newline padding around multiline statements, enforcing shorthand/method properties where possible, etc).

Anyway, that's by the by. For TS, what I was imagining was that we'd generate a .d.ts file separately, rather than including type annotations in the generated code. I'll confess I haven't spent a lot of time thinking about this, so don't honestly know if it'll work or not.

[Swatinem]

For TS, what I was imagining was that we'd generate a .d.ts file separately, rather than including type annotations in the generated code.

Well yes, but no matter if you want to generate .ts or separate .js/.d.ts files, it would be nice to generate those with a nice AST based DSL 😊 that's what I'm proposing

[marcus-sa]

Why not just use the TS compiler API to generate code instead of estree?