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tests/cases/conformance/types/spread/spreadDuplicateExact.ts(10,12): error TS2783: 'a' is specified more than once, so this usage will be overwritten.
tests/cases/conformance/types/spread/spreadDuplicateExact.ts(12,12): error TS2783: 'a' is specified more than once, so this usage will be overwritten.
==== tests/cases/conformance/types/spread/spreadDuplicateExact.ts (2 errors) ====
// Repro from #44438
declare let a: { a: string };
declare let b: { a?: string };
declare let c: { a: string | undefined };
declare let d: { a?: string | undefined };
declare let t: boolean;
let a1 = { a: 123, ...a }; // string (Error)
~~~~~~
!!! error TS2783: 'a' is specified more than once, so this usage will be overwritten.
!!! related TS2785 tests/cases/conformance/types/spread/spreadDuplicateExact.ts:10:20: This spread always overwrites this property.
let b1 = { a: 123, ...b }; // string | number
let c1 = { a: 123, ...c }; // string | undefined (Error)
~~~~~~
!!! error TS2783: 'a' is specified more than once, so this usage will be overwritten.
!!! related TS2785 tests/cases/conformance/types/spread/spreadDuplicateExact.ts:12:20: This spread always overwrites this property.
let d1 = { a: 123, ...d }; // string | number | undefined
let a2 = { a: 123, ...(t ? a : {}) }; // string | number
let b2 = { a: 123, ...(t ? b : {}) }; // string | number
let c2 = { a: 123, ...(t ? c : {}) }; // string | number | undefined
let d2 = { a: 123, ...(t ? d : {}) }; // string | number | undefined
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