Why does a void function pass as a plain object? Is this intentional or a mistake in the system?
type PlainObject = { [key: string]: any };
const foo = (value: PlainObject) => { }
const voidFn: () => void = () => { };
// Error as expected
foo(false);
foo(3);
foo('test');
foo ({ test: true }) // ok - expected usage
foo(voidFn); // Why is there no error here?
This issue only arises when the value is any. If it were, say, { [key: string]: string };, an error would be triggered.
Objects are functions in disguise.
const f = () => null;
const o = {};
console.log(f instanceof Function);
console.log(o instanceof Function);Even though functions and objects have different properties, they still share the commonality of being able to hold values within their properties.
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