es-toolkit/dist/function/once.mjs

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

function once(func) {
    let called = false;
    let cache;
    return function (...args) {
        if (!called) {
            called = true;
            cache = func(...args);
        }
        return cache;
    };
}

export { once };