tc39-weakrefs-shim/module/internal/WeakRef.js

Shim for TC39 Weakrefs proposal

import makePrivates from "../utils/privates.js";
import isObject from "../utils/lodash/isObject.js";
export class WeakRefSlots {
    constructor(targetInfo) {
        this.targetInfo = targetInfo;
    }
}
export function createWeakRefClassShim(jobs, getInfo, getTarget, initSlots = target => new WeakRefSlots(getInfo(target))) {
    const privates = makePrivates();
    class WeakRef {
        constructor(target) {
            if (!isObject(target))
                throw new TypeError();
            jobs.keepDuringJob(target);
            privates.init(this, initSlots(target, this));
        }
        deref() {
            const slots = privates(this);
            const target = getTarget(slots.targetInfo);
            if (target)
                jobs.keepDuringJob(target);
            return target;
        }
    }
    return [WeakRef, privates];
}
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