{
  "javascript": {
    "builtins": {
      "FinalizationRegistry": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry",
          "spec_url": "https://tc39.es/proposal-weakrefs/#sec-finalization-registry-objects",
          "support": {
            "chrome": {
              "version_added": "84"
            },
            "chrome_android": {
              "version_added": "84"
            },
            "edge": {
              "version_added": "84"
            },
            "firefox": {
              "version_added": "79"
            },
            "firefox_android": {
              "version_added": false
            },
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": "13.0.0",
              "flags": [
                {
                  "type": "runtime_flag",
                  "name": "--harmony-weak-refs"
                }
              ]
            },
            "opera": {
              "version_added": false
            },
            "opera_android": {
              "version_added": false
            },
            "safari": {
              "version_added": false
            },
            "safari_ios": {
              "version_added": false
            },
            "samsunginternet_android": {
              "version_added": false
            },
            "webview_android": {
              "version_added": "84"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "FinalizationRegistry": {
          "__compat": {
            "description": "<code>FinalizationRegistry()</code> constructor",
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry/FinalizationRegistry",
            "spec_url": "https://tc39.es/proposal-weakrefs/#sec-finalization-registry-constructor",
            "support": {
              "chrome": {
                "version_added": "84"
              },
              "chrome_android": {
                "version_added": "84"
              },
              "edge": {
                "version_added": "84"
              },
              "firefox": {
                "version_added": "79"
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "13.0.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony-weak-refs"
                  }
                ]
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "84"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "register": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry/register",
            "spec_url": "https://tc39.es/proposal-weakrefs/#sec-finalization-registry.prototype.register",
            "support": {
              "chrome": {
                "version_added": "84"
              },
              "chrome_android": {
                "version_added": "84"
              },
              "edge": {
                "version_added": "84"
              },
              "firefox": {
                "version_added": "79"
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "13.0.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony-weak-refs"
                  }
                ]
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "84"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "unregister": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry/unregister",
            "spec_url": "https://tc39.es/proposal-weakrefs/#sec-finalization-registry.prototype.unregister",
            "support": {
              "chrome": {
                "version_added": "84"
              },
              "chrome_android": {
                "version_added": "84"
              },
              "edge": {
                "version_added": "84"
              },
              "firefox": {
                "version_added": "79"
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "13.0.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony-weak-refs"
                  }
                ]
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "84"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}