Check out the interface and type declarations provided below:
interface Foo {
bar: {
a: number
b: string
}
}
type Foo = {
bar: {
a: number
b: string
}
}
Is it possible to obtain the type definitions for "baz"? This will allow us to perform operations similar to the following:
const v: keyof Foo.bar = "a";
Indeed, it is possible to do that
const invalid: Foo["bar"] = "a"; // Type '"a"' is not assignable to type '{ a: number; b: string; }'.(2322)
const valid: Foo["bar"] = { a: 1, b:'a' };
This functionality is supported using type and interface. You can test it on the live playground
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