1'use strict'
2
3/* istanbul ignore file: only for Node 12 */
4
5const { kConnected, kSize } = require('../core/symbols')
6
7class CompatWeakRef {
8  constructor (value) {
9    this.value = value
10  }
11
12  deref () {
13    return this.value[kConnected] === 0 && this.value[kSize] === 0
14      ? undefined
15      : this.value
16  }
17}
18
19class CompatFinalizer {
20  constructor (finalizer) {
21    this.finalizer = finalizer
22  }
23
24  register (dispatcher, key) {
25    if (dispatcher.on) {
26      dispatcher.on('disconnect', () => {
27        if (dispatcher[kConnected] === 0 && dispatcher[kSize] === 0) {
28          this.finalizer(key)
29        }
30      })
31    }
32  }
33}
34
35module.exports = function () {
36  // FIXME: remove workaround when the Node bug is fixed
37  // https://github.com/nodejs/node/issues/49344#issuecomment-1741776308
38  if (process.env.NODE_V8_COVERAGE) {
39    return {
40      WeakRef: CompatWeakRef,
41      FinalizationRegistry: CompatFinalizer
42    }
43  }
44  return {
45    WeakRef: global.WeakRef || CompatWeakRef,
46    FinalizationRegistry: global.FinalizationRegistry || CompatFinalizer
47  }
48}
49