Typeid support

[Le0Developer]

See #2033

This is a very rough draft. I originally tried to use the x-typeid-type property I proposed in jetify-com/typeid#45. Then I noticed there's an IR involved and decided to temporarily extract the type name from the example field instead (which I also had to add to the parsers/IR).

I've tested this by modifying the openapi-ts-fetch example. I downloaded the openapi.yml file and modified the id property of Order to be a typeid like this:

        id:
          type: string
          format: typeid
          example: order_1111

And added typeids: true, to the openapi-ts.config.ts file.

This produced this output:

type TypeID<T extends string> = `${T}_${string}`;

export type Order = {
  complete?: boolean;
  id?: TypeID<'order'>;
  /* ... */
}

Nice 🎉

Currently the TypeID declaration is always added. Which means if you enable the config option but don't use typeids, you'll get an unused type warning.

Questions

• I want to use x-typeid-type instead of parsing the example value, but I'm unsure given the current IR infrastructure. I don't believe adding arbitrary extensions to the parser is maintainable. One I had was: what if the IR had an extra field which simply contained the original object or just x-* properties? This feels more future-proof to me.
• Should TypeID<T> be exported or should consumers do User["id"] instead of TypeID<"user"> if they want to access the type themselves?
• Should there be a concrete type per ID (eg type UserID = "user_${string}") instead of the TypeID "overlord" (or maybe both)? This would require extending the "State" interface to keep track of already generated ID types

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Codecov Report

Attention: Patch coverage is 2.04082% with 48 lines in your changes missing coverage. Please review.

Project coverage is 22.59%. Comparing base (66f89a4) to head (31bdccd).

Files with missing lines	Patch %	Lines
...enapi-ts/src/plugins/@hey-api/typescript/plugin.ts	0.00%	39 Missing ⚠️
...ages/openapi-ts/src/openApi/2.0.x/parser/schema.ts	0.00%	3 Missing ⚠️
...ages/openapi-ts/src/openApi/3.0.x/parser/schema.ts	0.00%	3 Missing ⚠️
...ages/openapi-ts/src/openApi/3.1.x/parser/schema.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2034      +/-   ##
==========================================
- Coverage   22.64%   22.59%   -0.05%     
==========================================
  Files         252      252              
  Lines       21475    21524      +49     
  Branches      818      818              
==========================================
+ Hits         4862     4863       +1     
- Misses      16607    16655      +48     
  Partials        6        6              

Flag	Coverage Δ
unittests	22.59% <2.04%> (-0.05%)	⬇️

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