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tests/cases/conformance/types/spread/spreadUnion3.ts(2,14): error TS2322: Type 'number' is not assignable to type 'string'.
tests/cases/conformance/types/spread/spreadUnion3.ts(9,9): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
tests/cases/conformance/types/spread/spreadUnion3.ts(17,11): error TS2698: Spread types may only be created from object types.
tests/cases/conformance/types/spread/spreadUnion3.ts(17,37): error TS2698: Spread types may only be created from object types.
tests/cases/conformance/types/spread/spreadUnion3.ts(18,11): error TS2698: Spread types may only be created from object types.
==== tests/cases/conformance/types/spread/spreadUnion3.ts (5 errors) ====
function f(x: { y: string } | undefined): { y: string } {
return { y: 123, ...x } // y: string | number
~
!!! error TS2322: Type 'number' is not assignable to type 'string'.
!!! related TS6500 tests/cases/conformance/types/spread/spreadUnion3.ts:1:45: The expected type comes from property 'y' which is declared here on type '{ y: string; }'
}
f(undefined)
function g(t?: { a: number } | null): void {
let b = { ...t };
let c: number = b.a; // might not have 'a'
~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
}
g()
g(undefined)
g(null)
// spreading nothing but null and undefined is not allowed
declare const nullAndUndefinedUnion: null | undefined;
var x = { ...nullAndUndefinedUnion, ...nullAndUndefinedUnion };
~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2698: Spread types may only be created from object types.
~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2698: Spread types may only be created from object types.
var y = { ...nullAndUndefinedUnion };
~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2698: Spread types may only be created from object types.
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