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fix(openapi-typescript-helpers): preserve tuple types in Readable/Writable #2673

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fix(openapi-typescript-helpers): preserve tuple types in Readable/Writable #2673

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fix(openapi-typescript-helpers): preserve tuple types in Readable/Wri…
panwauu Mar 12, 2026
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panwauu Mar 12, 2026
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5 changes: 5 additions & 0 deletions .changeset/wide-pianos-exist.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"openapi-typescript-helpers": patch
---

Preserve tuple types in Readable<T> and Writable<T> by using mapped type instead of (infer E)[] pattern
8 changes: 4 additions & 4 deletions packages/openapi-typescript-helpers/src/index.ts
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Expand Up @@ -221,8 +221,8 @@ export type Readable<T> =
? never
: T extends $Read<infer U>
? Readable<U>
: T extends (infer E)[]
? Readable<E>[]
: T extends readonly any[]
? { [K in keyof T]: Readable<T[K]> }
: T extends object
? { [K in keyof T as NonNullable<T[K]> extends $Write<any> ? never : K]: Readable<T[K]> }
: T;
Expand All @@ -238,8 +238,8 @@ export type Writable<T> =
? never
: T extends $Write<infer U>
? Writable<U>
: T extends (infer E)[]
? Writable<E>[]
: T extends readonly any[]
? { [K in keyof T]: Writable<T[K]> }
: T extends object
? { [K in keyof T as NonNullable<T[K]> extends $Read<any> ? never : K]: Writable<T[K]> } & {
[K in keyof T as NonNullable<T[K]> extends $Read<any> ? K : never]?: never;
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