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fix/correctly-infer-optional-query-parameters #74

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23 changes: 15 additions & 8 deletions src/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ export type OpenapiPaths<Paths> = {

// https://github.com/ajaishankar/openapi-typescript-fetch/issues/71#issuecomment-2847360598
type NonNever<T> = [T] extends [never | undefined] ? unknown : T
type IsAny<T> = 0 extends (1 & T) ? true : false;

export type OpArgType<OP> = OP extends {
parameters?: {
Expand Down Expand Up @@ -119,15 +120,21 @@ export type FetchErrorType<F> = F extends TypedFetch<infer OP>
? OpErrorType<OP>
: never

type _CreateFetch<OP, Q = never> = [Q] extends [never]
? () => TypedFetch<OP>
: (query: Q) => TypedFetch<OP>

export type CreateFetch<M, OP> = M extends 'post' | 'put' | 'patch' | 'delete'
? OP extends { parameters: { query: infer Q } }
? _CreateFetch<OP, { [K in keyof Q]: true | 1 }>
: _CreateFetch<OP>
: _CreateFetch<OP>
? OP extends {
parameters: {
query?: infer Q;
};
}
? IsAny<Q> extends true
? () => TypedFetch<OP>
: [keyof Q] extends [never]
? () => TypedFetch<OP>
: {} extends Q
? (query?: { [K in keyof Q]: true | 1 }) => TypedFetch<OP>
: (query: { [K in keyof Q]: true | 1 }) => TypedFetch<OP>
: () => TypedFetch<OP>
: () => TypedFetch<OP>;

export type Middleware = (
url: string,
Expand Down