starface-outlook-sync-addin/node_modules/tsyringe/dist/esm2015/factories/instance-caching-factory.js

export default function instanceCachingFactory(factoryFunc) {
    let instance;
    return (dependencyContainer) => {
        if (instance == undefined) {
            instance = factoryFunc(dependencyContainer);
        }
        return instance;
    };
}