File: instanceofNarrowReadonlyArray.types

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=== tests/cases/compiler/instanceofNarrowReadonlyArray.ts ===
// @strict

function narrow(x: readonly number[] | number): readonly number[] {
>narrow : (x: readonly number[] | number) => readonly number[]
>x : number | readonly number[]

    if (x instanceof Array) {
>x instanceof Array : boolean
>x : number | readonly number[]
>Array : ArrayConstructor

        return x;
>x : readonly number[]

    } else {
        return [x];
>[x] : number[]
>x : number
    }
}