tc39-weakrefs-shim/module/node/index.js

Shim for TC39 Weakrefs proposal

// @ts-ignore
import WeakTag from "@mhofman/weak-napi-native/weak-tag.js";
// @ts-ignore
import ObjectInfo from "@mhofman/weak-napi-native/object-info.js";
import { createWeakRefClassShim } from "../internal/WeakRef.js";
import { createFinalizationGroupClassShim } from "../internal/FinalizationGroup.js";
import { createWeakRefJobsForTaskQueue } from "../internal/WeakRefJobs.js";
import { createFinalizationGroupJobsForTaskQueue } from "../internal/FinalizationGroupJobs.js";
import { setImmediate } from "../utils/tasks/setImmediate.js";
export { gc } from "./gc.js";
const tagCollector = new WeakMap();
const observedInfos = new Set();
function finalizedCallback() {
    if (!observedInfos.has(this))
        return;
    observedInfos.delete(this);
    finalizationGroupJobs.setFinalized(this);
}
function getInfo(target) {
    let objectDetails = tagCollector.get(target);
    if (!objectDetails) {
        const info = new ObjectInfo(target, finalizedCallback);
        objectDetails = { info, tag: new WeakTag(info) };
        tagCollector.set(target, objectDetails);
    }
    return objectDetails.info;
}
const finalizationGroupJobs = createFinalizationGroupJobsForTaskQueue(setImmediate, {
    registerObjectInfo: info => {
        observedInfos.add(info);
    },
    unregisterObjectInfo: info => {
        observedInfos.delete(info);
    },
});
export const [WeakRef] = createWeakRefClassShim(createWeakRefJobsForTaskQueue(setImmediate), getInfo, info => info.target);
export const FinalizationGroup = createFinalizationGroupClassShim(finalizationGroupJobs, getInfo, info => observedInfos.has(info));
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