{
  "javascript": {
    "builtins": {
      "Map": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map",
          "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map-objects",
          "support": {
            "chrome": {
              "version_added": "38"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "13"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "11"
            },
            "nodejs": {
              "version_added": "0.12.0"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "8"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "Map": {
          "__compat": {
            "description": "<code>Map()</code> constructor",
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/Map",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map-constructor",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "13"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          },
          "iterable_allowed": {
            "__compat": {
              "description": "<code>new Map(iterable)</code>",
              "support": {
                "chrome": {
                  "version_added": "38"
                },
                "chrome_android": "mirror",
                "deno": {
                  "version_added": "1.0"
                },
                "edge": {
                  "version_added": "12"
                },
                "firefox": {
                  "version_added": "13"
                },
                "firefox_android": "mirror",
                "ie": {
                  "version_added": false
                },
                "nodejs": {
                  "version_added": "0.12.0"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                  "version_added": "9"
                },
                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror"
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          },
          "new_required": {
            "__compat": {
              "description": "<code>Map()</code> without <code>new</code> throws",
              "support": {
                "chrome": {
                  "version_added": "38"
                },
                "chrome_android": "mirror",
                "deno": {
                  "version_added": "1.0"
                },
                "edge": {
                  "version_added": "12"
                },
                "firefox": {
                  "version_added": "42"
                },
                "firefox_android": "mirror",
                "ie": {
                  "version_added": "11"
                },
                "nodejs": {
                  "version_added": "0.12.0"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                  "version_added": "9"
                },
                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror"
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          },
          "null_allowed": {
            "__compat": {
              "description": "<code>new Map(null)</code>",
              "support": {
                "chrome": {
                  "version_added": "38"
                },
                "chrome_android": "mirror",
                "deno": {
                  "version_added": "1.0"
                },
                "edge": {
                  "version_added": "12"
                },
                "firefox": {
                  "version_added": "37"
                },
                "firefox_android": "mirror",
                "ie": {
                  "version_added": "11"
                },
                "nodejs": {
                  "version_added": "0.12.0"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                  "version_added": "9"
                },
                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror"
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          }
        },
        "clear": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/clear",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.clear",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "19"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "delete": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/delete",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.delete",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "13"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "entries": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/entries",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.entries",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "20"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "forEach": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.foreach",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "25"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "get": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/get",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.get",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "13"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "groupBy": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/groupBy",
            "spec_url": "https://tc39.es/proposal-array-grouping/#sec-map.groupby",
            "support": {
              "chrome": {
                "version_added": "117"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.37"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "119"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "preview"
                },
                {
                  "alternative_name": "Array.prototype.groupToMap",
                  "version_added": "16.4",
                  "version_removed": "preview"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "has": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/has",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.has",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "13"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "key_equality_for_zeros": {
          "__compat": {
            "description": "Key equality for -0 and 0",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "29"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "4.0.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "9"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "keys": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/keys",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.keys",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "20"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "set": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/set",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.set",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "13"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11",
                "partial_implementation": true,
                "notes": "Returns 'undefined' instead of the 'Map' object."
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "size": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/size",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-get-map.prototype.size",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "19",
                "notes": "From Firefox 13 to Firefox 18, the <code>size</code> property was implemented as a <code>Map.prototype.size()</code> method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification."
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": "11"
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "values": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/values",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype.values",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "20"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "8"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "@@iterator": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/@@iterator",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-map.prototype-@@iterator",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": [
                {
                  "version_added": "36"
                },
                {
                  "alternative_name": "@@iterator",
                  "version_added": "27",
                  "version_removed": "36",
                  "notes": "A placeholder property named <code>@@iterator</code> is used."
                },
                {
                  "alternative_name": "iterator",
                  "version_added": "17",
                  "version_removed": "27",
                  "notes": "A placeholder property named <code>iterator</code> is used."
                }
              ],
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "10"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "@@species": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map/@@species",
            "spec_url": "https://tc39.es/ecma262/multipage/keyed-collections.html#sec-get-map-@@species",
            "support": {
              "chrome": {
                "version_added": "51"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "13"
              },
              "firefox": {
                "version_added": "41"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.5.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "10"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}