callFunction()

Normalizes a MaybeFn — a value that may be either a plain TValue or a function (...args: TArgs) => TValue. If fn is callable, it is invoked with args and the return value is returned; otherwise fn is returned as-is (treated as the resolved value).

Typical uses: config fields that accept a static value or a lazy/computed factory, theme tokens, labels, or callbacks where the caller should not branch on typeof fn themselves.

Examples:

Plain value — returned unchanged (no call):

const n = callFunction(42); // 42
const label = callFunction('Hello'); // 'Hello'

Function — called with the given arguments:

const sum = callFunction((a: number, b: number) => a + b, 2, 3); // 5

Same API for “static or factory” props:

type Title = MaybeFn<string, [locale: string]>;
const title: Title = (loc) => (loc === 'ru' ? 'Привет' : 'Hi');
const text = callFunction(title, 'ru'); // 'Привет'
const fixed = callFunction('Hi', 'ru'); // 'Hi' — args ignored