jotai/dist/vanilla/atom.js

👻 Primitive and flexible state management for React

let keyCount = 0; // global key count for all atoms
export function atom(read, write) {
    const key = `atom${++keyCount}`;
    const config = {
        toString() {
            return process.env.NODE_ENV !== 'production' && this.debugLabel
                ? key + ':' + this.debugLabel
                : key;
        },
    };
    if (typeof read === 'function') {
        config.read = read;
    }
    else {
        config.init = read;
        config.read = defaultRead;
        config.write = defaultWrite;
    }
    if (write) {
        config.write = write;
    }
    return config;
}
function defaultRead(get) {
    return get(this);
}
function defaultWrite(get, set, arg) {
    return set(this, typeof arg === 'function'
        ? arg(get(this))
        : arg);
}