@fanoutio/eventstream/build/utils/singleton.js

Connect-compatible middleware that enables the easy creation of EventStream endpoints

const singletons = {};
export function getProcessSingletons() {
    let dict;
    if (process.env.NODE_ENV !== 'production') {
        const proc = process;
        if (proc.devSingletons == null) {
            proc.devSingletons = {};
        }
        dict = proc.devSingletons;
    }
    else {
        dict = singletons;
    }
    return dict;
}
export function getProcessSingleton(key, fn) {
    const dict = getProcessSingletons();
    if (!(key in dict)) {
        dict[key] = fn();
    }
    return dict[key];
}