feat: add support for multiple interface extensions

[tvillaren]

Why

As I had similar needs as the one mentioned in #67, i.e. to be able to support multiple interface extends, I decided to give it a go.

Input

With the following definition

// typescript type or interface causing the output
export interface a {
    type: string
}

export interface b {
    id: string
}

export interface c extends a, b {
    value: number
}

or

export interface c extends a extends b {
    value: number
}

Output

I don't think merging the Object Literals as described in the original ticket makes sense (and it's probably more difficult to implement 😉 ) so I want with a simple extend referencing the schema's shape property.

// Expected Zod schemas
import { z } from 'zod'

export const aSchema = z.object({
    type: z.string(),
})

export const bSchema = z.object({
    id: z.string(),
})

export const cSchema = aSchema.extend(bSchema.shape).extend({
    value: z.number(),
})

Note

I'm not sure of the semantic difference between using the "extend chain" (c extends a extends b) and the "extend types" (c extends a,b) so implemented them the same way for now. To be discussed maybe.

[codecov-commenter]

Codecov Report

Merging #68 (b8f094b) into main (e5e4961) will decrease coverage by 1.39%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   98.49%   97.09%   -1.40%     
==========================================
  Files           8       11       +3     
  Lines         332      482     +150     
  Branches      102      148      +46     
==========================================
+ Hits          327      468     +141     
- Misses          5       11       +6     
- Partials        0        3       +3     

Impacted Files	Coverage Δ
src/core/generateZodSchema.ts	95.23% <92.40%> (-1.97%)	⬇️
src/utils/resolveDefaultProperties.ts	95.23% <95.23%> (ø)
src/utils/resolveModules.ts	97.87% <97.87%> (ø)
src/core/generate.ts	100.00% <100.00%> (ø)
src/core/jsDocTags.ts	98.50% <100.00%> (-1.50%)	⬇️
src/core/validateGeneratedTypes.ts	97.50% <100.00%> (+0.13%)	⬆️
src/utils/isNotNull.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b5043eb...b8f094b. Read the comment docs.

[tvillaren]

I'm not sure about the codecov report as I didn't change the src/core/jsDocTags.ts nor src/core/validateGeneratedTypes.ts files.
And the reported uncovered lines are mostly (but one) from code paths I haven't added.

[fabien0102]

I'm not sure about the codecov report as I didn't change the src/core/jsDocTags.ts nor src/core/validateGeneratedTypes.ts files. And the reported uncovered lines are mostly (but one) from code paths I haven't added.

Please ignore it, this tool is sadly not reliable and is almost always failing… I need to remove it

[fabien0102]

Looks good to me, thanks for the contribution, really appreciated!