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

Shim for TC39 Weakrefs proposal

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const privates_js_1 = __importDefault(require("../utils/privates.js"));
const isObject_js_1 = __importDefault(require("../utils/lodash/isObject.js"));
class WeakRefSlots {
    constructor(targetInfo) {
        this.targetInfo = targetInfo;
    }
}
exports.WeakRefSlots = WeakRefSlots;
function createWeakRefClassShim(jobs, getInfo, getTarget, initSlots = target => new WeakRefSlots(getInfo(target))) {
    const privates = privates_js_1.default();
    class WeakRef {
        constructor(target) {
            if (!isObject_js_1.default(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];
}
exports.createWeakRefClassShim = createWeakRefClassShim;
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