My current interface is structured like this:
export interface Foo {
data?: Foo;
bar?: boolean;
}
Depending on the scenario, data is used as foo.data.bar or foo.bar. However, when implementing the above interface, I encounter the error message:
Property 'bar' does not exist on type 'Foo | undefined'This error seems odd to me. How can I modify the interface so that data can carry the types of Foo?
When data has a question mark, it means that it can either be an instance of Foo, or it could be undefined:
data?: Foo;
The error you're experiencing is because if data is undefined, there is no bar property to access.
If data will always contain an instance of Foo, simply removing the ? will fix the issue:
data: Foo;
Alternatively, you can utilize optional chaining when accessing bar:
const bar = foo.data?.bar;
Another option is to check if foo.data is defined before accessing bar:
if (foo.data) {
const bar = foo.data.bar;
}
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