graphql/jsutils/memoize3.mjs

A Query Language and Runtime which can target any service.

export function memoize3(fn) {
    let cache0;
    return function memoized(a1, a2, a3) {
        cache0 ??= new WeakMap();
        let cache1 = cache0.get(a1);
        if (cache1 === undefined) {
            cache1 = new WeakMap();
            cache0.set(a1, cache1);
        }
        let cache2 = cache1.get(a2);
        if (cache2 === undefined) {
            cache2 = new WeakMap();
            cache1.set(a2, cache2);
        }
        let fnResult = cache2.get(a3);
        if (fnResult === undefined) {
            fnResult = fn(a1, a2, a3);
            cache2.set(a3, fnResult);
        }
        return fnResult;
    };
}
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