fix: make CID#asCID a regular property

Author: rvagg

package.json

@@ -157,8 +157,7 @@
   "eslintConfig": {
     "extends": "ipfs",
     "parserOptions": {
-      "sourceType": "module",
-      "ecmaVersion": 13
+      "sourceType": "module"
     }
   },
   "release": {

src/cid.js

@@ -61,9 +61,6 @@ const baseCache = cid => {
  */
 
 export class CID {
-  /** @type {CID} */
-  #asCID
-
   /**
    * @param {Version} version - Version of the CID
    * @param {Format} code - Code of the codec content is encoded in, see https://github.com/multiformats/multicodec/blob/master/table.csv
@@ -89,11 +86,7 @@ export class CID {
 
     // Circular reference
     /** @readonly */
-    this.#asCID = this
-  }
-
-  get asCID () {
-    return this.#asCID
+    this.asCID = this
   }
 
   /**

test/test-cid.spec.js

@@ -697,21 +697,15 @@ describe('CID', () => {
     assert.throws(() => CID.decode(encoded), 'Invalid CID version 2')
   })
 
-  it('asCID is non-enumerable', () => {
-    const cid = CID.parse('bafybeif2pall7dybz7vecqka3zo24irdwabwdi4wc55jznaq75q7eaavvu')
-
-    assert.isFalse(Object.prototype.propertyIsEnumerable.call(cid, 'asCID'))
-    assert.isFalse(Object.keys(cid).includes('asCID'))
-    assert.equal(cid.asCID, cid)
-  })
-
   it('CID can be moved across JS realms', async () => {
     const cid = CID.parse('bafybeif2pall7dybz7vecqka3zo24irdwabwdi4wc55jznaq75q7eaavvu')
     const { port1: sender, port2: receiver } = new MessageChannel()
     sender.postMessage(cid)
     const cid2 = await new Promise((resolve) => {
       receiver.onmessage = (event) => { resolve(event.data) }
     })
-    assert.equal(cid2.asCID, cid2)
+    assert.strictEqual(cid2.asCID, cid2)
+    sender.close()
+    receiver.close()
   })
 })