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mappedTypeAsStringTemplate.ts(7,5): error TS2345: Argument of type '{ x: number; }' is not assignable to parameter of type '{ xy: number; }'.
Property 'xy' is missing in type '{ x: number; }' but required in type '{ xy: number; }'.
==== mappedTypeAsStringTemplate.ts (1 errors) ====
// Repro from #44220
function foo<T extends { [K in keyof T as `${Extract<K, string>}y`]: number }>(foox: T) { }
const c = { x: 1 };
foo(c);
~
!!! error TS2345: Argument of type '{ x: number; }' is not assignable to parameter of type '{ xy: number; }'.
!!! error TS2345: Property 'xy' is missing in type '{ x: number; }' but required in type '{ xy: number; }'.
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