Function getLazy

lib/internal/util.js:772–782

* Helper function to lazy-load an initialize-once value. * @template T Return value of initializer * @param {()=>T} initializer Initializer of the lazily loaded value. * @returns {()=>T}

(initializer)

 * @returns {()=>T}
 */
function getLazy(initializer) {
  let value;
  let initialized = false;
  return function() {
    if (initialized === false) {
      value = initializer();
      initialized = true;
    }
    return value;
  };
}

// Setup user-facing NODE_V8_COVERAGE environment variable that writes
// ScriptCoverage objects to a specified directory.