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statements.json
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{
"javascript": {
"statements": {
"async_function": {
"__compat": {
"description": "`async function` statement",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/async_function",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-async-function-definitions",
"tags": [
"web-features:async-await"
],
"support": {
"chrome": {
"version_added": "55"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "15"
},
"firefox": {
"version_added": "52"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "7.6.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "10.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"async_generator_function": {
"__compat": {
"description": "`async function*` statement",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/async_function*",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-async-generator-function-definitions",
"tags": [
"web-features:async-generators"
],
"support": {
"chrome": {
"version_added": "63"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": "mirror",
"firefox": {
"version_added": "55"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "10.0.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "12"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"block": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/block",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-block",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "11"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "3"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"break": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/break",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-break-statement",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "4"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"class": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/class",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-class-definitions",
"tags": [
"web-features:class-syntax",
"web-features:snapshot:ecmascript-2015"
],
"support": {
"chrome": [
{
"version_added": "49"
},
{
"version_added": "42",
"version_removed": "49",
"notes": "Strict mode is required."
}
],
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "13"
},
"firefox": {
"version_added": "45"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "6.0.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "10.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"const": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/const",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations",
"tags": [
"web-features:snapshot:ecmascript-2015",
"web-features:let-const"
],
"support": {
"chrome": {
"version_added": "21"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "36",
"notes": [
"Before Firefox 13, `const` is implemented, but re-assignment is not failing.",
"Before Firefox 46, a `TypeError` was thrown on redeclaration instead of a `SyntaxError`."
]
},
"firefox_android": "mirror",
"ie": {
"version_added": "11"
},
"nodejs": {
"version_added": "6.0.0"
},
"oculus": "mirror",
"opera": {
"version_added": "9"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "5.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"continue": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/continue",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-continue-statement",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "4"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"debugger": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/debugger",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-debugger-statement",
"tags": [
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "5"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "4"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "10"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "5"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"do_while": {
"__compat": {
"description": "`do...while`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/do...while",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-do-while-statement",
"tags": [
"web-features:snapshot:ecmascript-3",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "4"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "4"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"empty": {
"__compat": {
"description": "Empty statement (`;`)",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/Empty",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-empty-statement",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "3"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "3"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "5"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"export": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
"tags": [
"web-features:js-modules"
],
"support": {
"chrome": {
"version_added": "61"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "16"
},
"firefox": {
"version_added": "60"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "13.2.0",
"notes": "Modules must either have a filename ending in `.mjs`, or the nearest parent `package.json` file must contain `\"type\": \"module\"`. See Node's [ECMAScript Modules documentation](https://nodejs.org/api/esm.html#esm_enabling) for more details."
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "10.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
},
"default": {
"__compat": {
"description": "`default` keyword with `export`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
"tags": [
"web-features:js-modules"
],
"support": {
"chrome": {
"version_added": "61"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "16"
},
"firefox": {
"version_added": "60"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "13.2.0",
"notes": "Modules must either have a filename ending in `.mjs`, or the nearest parent `package.json` file must contain `\"type\": \"module\"`. See Node's [ECMAScript Modules documentation](https://nodejs.org/api/esm.html#esm_enabling) for more details."
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "10.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"namespace": {
"__compat": {
"description": "`export * as namespace`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
"tags": [
"web-features:js-modules"
],
"support": {
"chrome": {
"version_added": "72"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": "mirror",
"firefox": {
"version_added": "80"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "13.2.0",
"notes": "Modules must either have a filename ending in `.mjs`, or the nearest parent `package.json` file must contain `\"type\": \"module\"`. See Node's [ECMAScript Modules documentation](https://nodejs.org/api/esm.html#esm_enabling) for more details."
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "14.1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
}
},
"for": {
"__compat": {
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-statement",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "3"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"for_await_of": {
"__compat": {
"description": "`for await...of`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for-await...of",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements",
"tags": [
"web-features:snapshot:ecmascript-2018",
"web-features:async-iterators"
],
"support": {
"chrome": {
"version_added": "63"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": "mirror",
"firefox": {
"version_added": "57"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "10.0.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "12"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"for_in": {
"__compat": {
"description": "`for...in`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for...in",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:javascript"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "2"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"for_of": {
"__compat": {
"description": "`for...of`",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for...of",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements",
"tags": [
"web-features:snapshot:ecmascript-2015",
"web-features:iterators"
],
"support": {
"chrome": {
"version_added": "38"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "13",
"notes": "Before Firefox 51, using the `for...of` loop construct with the `const` keyword threw a `SyntaxError` (\"missing = in const declaration\")."
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "0.12.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "7"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
},
"async_iterators": {
"__compat": {
"description": "async iterators",
"tags": [
"web-features:snapshot:ecmascript-2018",
"web-features:async-iterators"
],
"support": {
"chrome": {
"version_added": "63"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "57"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "10.0.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "7"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
},
"closing_iterators": {
"__compat": {
"description": "Closing iterators",
"tags": [
"web-features:iterators"
],
"support": {
"chrome": {
"version_added": "51"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "14"
},
"firefox": {
"version_added": "53"
},
"firefox_android": "mirror",
"ie": {
"version_added": false
},
"nodejs": {
"version_added": "6.5.0"
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "7"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
}
},
"function": {
"__compat": {
"description": "`function` statement",
"mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function",
"spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-function-definitions",
"tags": [
"web-features:snapshot:ecmascript-1",
"web-features:functions"
],
"support": {
"chrome": {
"version_added": "1"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.0"
},
"edge": {
"version_added": "12"
},
"firefox": {
"version_added": "1"
},
"firefox_android": "mirror",
"ie": {
"version_added": "3"
},
"nodejs": {
"version_added": "0.10.0"
},
"oculus": "mirror",
"opera": {
"version_added": "3"
},
"opera_android": {
"version_added": "10.1"
},
"safari": {
"version_added": "1"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
},
"trailing_comma_in_parameters": {
"__compat": {
"description": "Trailing comma in parameters",
"tags": [
"web-features:functions"
],
"support": {
"chrome": {