Missing optional modifier in conversion of eagerly resolved mapped types

[Gerrit0]

Search terms

missing optional, mapped types

Bug

When TypeDoc is given the following to document, it says the type of Test is { x: 1 | undefined } instead of { x?: 1 | undefined }

declare function buildObj<T>(x: T): {
    [K in keyof T]?: 1;
};

export const Test = buildObj({ x: 1 });

This happens with exactOptionalPropertyTypes both on and off.

Environment

• Typedoc version: 0.23 + 0.24
• TypeScript version: 4.9.5
• Node.js version: 18
• OS: Linux