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indexedAccessWithVariableElement.ts(7,7): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
indexedAccessWithVariableElement.ts(13,7): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
==== indexedAccessWithVariableElement.ts (2 errors) ====
// repro from https://github.com/microsoft/TypeScript/issues/54420
declare const array1: [...number[], number]
const el1: number = array1[0]
declare const array2: [...number[], number]
const el2: number = array2[1]
~~~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
declare const array3: [number, ...number[], number]
const el3: number = array3[1]
declare const array4: [number, ...number[], number]
const el4: number = array4[2]
~~~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
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