tc39-weakrefs-shim/module/utils/privates.js

Shim for TC39 Weakrefs proposal

export default function makePrivates() {
    const privates = new WeakMap();
    function get(instance) {
        if (!privates.has(instance))
            throw new Error("Invalid object");
        return privates.get(instance);
    }
    get.init = function init(instance, data) {
        if (privates.has(instance))
            throw new Error("Invalid object");
        privates.set(instance, data);
    };
    return get;
}
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