atom.js

实现

---

const nodes = new Map();

function atom(options) {
  let value = options.default;
  let node = {
    key: options.key,
    get() {
      return value;
    },
    set(newValue) {
      value = newValue;
    },
  };
  nodes.set(node.key, node);
  return node;
}

export default atom;