File: typeGuardNarrowsIndexedAccessOfKnownProperty4.types

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=== tests/cases/compiler/typeGuardNarrowsIndexedAccessOfKnownProperty4.ts ===
class Foo {
>Foo : Foo

    x: number | undefined;
>x : number | undefined

    constructor() {
        this.x = 5;
>this.x = 5 : 5
>this.x : number | undefined
>this : this
>x : number | undefined
>5 : 5

        this.x;    // number
>this.x : number
>this : this
>x : number

        this['x']; // number
>this['x'] : number
>this : this
>'x' : "x"

        const key = 'x';
>key : "x"
>'x' : "x"

        this[key]; // number
>this[key] : number
>this : this
>key : "x"
    }
}