1  // eslint-disable-next-line import/prefer-default-export
 2  export function memoize<T extends unknown[], S>(
 3      fn: (...args: T) => S,
 4      hashFn: (...args: unknown[]) => string = JSON.stringify,
 5      entryLimit = 5,
 6  ): (...args: T) => S {
 7      const cache: Map<string, S> = new Map();
 8  
 9      return (...args: T) => {
10          const value = hashFn(args);
11          if (cache.has(value)) {
12              return cache.get(value);
13          }
14  
15          const returnedValue: S = fn.apply(this, args);
16  
17          if (cache.size >= entryLimit) {
18              const iterator = cache.keys();
19              const firstValue = iterator.next().value;
20              // remove oldest value
21              cache.delete(firstValue);
22          }
23          cache.set(value, returnedValue);
24          return returnedValue;
25      };
26  }