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=== tests/cases/compiler/intersectionsAndOptionalProperties.ts ===
declare let x: { a?: number, b: string };
>x : { a?: number | undefined; b: string; }
>a : number | undefined
>b : string
declare let y: { a: null, b: string };
>y : { a: null; b: string; }
>a : null
>null : null
>b : string
declare let z: { a: null } & { b: string };
>z : { a: null; } & { b: string; }
>a : null
>null : null
>b : string
x = y; // Error
>x = y : { a: null; b: string; }
>x : { a?: number | undefined; b: string; }
>y : { a: null; b: string; }
x = z; // Error
>x = z : { a: null; } & { b: string; }
>x : { a?: number | undefined; b: string; }
>z : { a: null; } & { b: string; }
// Repro from #36604
interface To {
field?: number;
>field : number | undefined
anotherField: string;
>anotherField : string
}
type From = { field: null } & Omit<To, 'field'>;
>From : { field: null; } & Omit<To, "field">
>field : null
>null : null
function foo(v: From) {
>foo : (v: From) => void
>v : From
let x: To;
>x : To
x = v; // Error
>x = v : From
>x : To
>v : From
x.field = v.field; // Error
>x.field = v.field : null
>x.field : number | undefined
>x : To
>field : number | undefined
>v.field : null
>v : From
>field : null
}
// Repro from #38348
const yy: number[] & [number, ...number[]] = [1];
>yy : number[] & [number, ...number[]]
>[1] : [number]
>1 : 1
const xx: [number, ...number[]] = yy;
>xx : [number, ...number[]]
>yy : number[] & [number, ...number[]]
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