Function memoize

cli/api.ts:33–43

* We need to make sure the file reading and parsing is lazy so that failure to * statically analyze the hyper configuration isn't fatal for all kinds of * subcommands. We can use memoization to make reading and parsing lazy.

(fn: T)

 * subcommands. We can use memoization to make reading and parsing lazy.
 */
function memoize<T extends (...args: any[]) => any>(fn: T): T {
  let hasResult = false;
  let result: any;
  return ((...args: any[]) => {
    if (!hasResult) {
      result = fn(...args);
      hasResult = true;
    }
    return result;
  }) as T;
}

const getFileContents = memoize(() => {
  try {