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tests/cases/compiler/indexWithUndefinedAndNull.ts(9,21): error TS2538: Type 'undefined' cannot be used as an index type.
tests/cases/compiler/indexWithUndefinedAndNull.ts(10,9): error TS2538: Type 'null' cannot be used as an index type.
tests/cases/compiler/indexWithUndefinedAndNull.ts(11,21): error TS2538: Type 'undefined' cannot be used as an index type.
tests/cases/compiler/indexWithUndefinedAndNull.ts(12,9): error TS2538: Type 'null' cannot be used as an index type.
==== tests/cases/compiler/indexWithUndefinedAndNull.ts (4 errors) ====
interface N {
[n: number]: string;
}
interface S {
[s: string]: number;
}
let n: N;
let s: S;
let str: string = n[undefined];
~~~~~~~~~
!!! error TS2538: Type 'undefined' cannot be used as an index type.
str = n[null];
~~~~
!!! error TS2538: Type 'null' cannot be used as an index type.
let num: number = s[undefined];
~~~~~~~~~
!!! error TS2538: Type 'undefined' cannot be used as an index type.
num = s[null];
~~~~
!!! error TS2538: Type 'null' cannot be used as an index type.
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