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tests/cases/conformance/expressions/optionalChaining/callChain/callChain.3.ts(3,7): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
tests/cases/conformance/expressions/optionalChaining/callChain/callChain.3.ts(4,7): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
==== tests/cases/conformance/expressions/optionalChaining/callChain/callChain.3.ts (2 errors) ====
declare function absorb<T>(): T;
declare const a: { m?<T>(obj: {x: T}): T } | undefined;
const n1: number = a?.m?.({x: 12 }); // should be an error (`undefined` is not assignable to `number`)
~~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
const n2: number = a?.m?.({x: absorb()}); // likewise
~~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
const n3: number | undefined = a?.m?.({x: 12}); // should be ok
const n4: number | undefined = a?.m?.({x: absorb()}); // likewise
// Also a test showing `!` vs `?` for good measure
let t1 = a?.m?.({x: 12});
t1 = a!.m!({x: 12});
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