File: strictOptionalProperties4.types

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=== tests/cases/compiler/a.js ===
/**
 * @typedef Foo
 * @property {number} [foo]
 */

const x = /** @type {Foo} */ ({});
>x : Foo
>({}) : Foo
>{} : {}

x.foo; // number | undefined
>x.foo : number | undefined
>x : Foo
>foo : number | undefined

const y = /** @type {Required<Foo>} */ ({});
>y : Required<Foo>
>({}) : Required<Foo>
>{} : {}

y.foo; // number
>y.foo : number
>y : Required<Foo>
>foo : number