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data-common.json
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data-common.json
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{
"babel": {
"corejs": {
"val": true,
"note_id": "babel-core-js",
"note_html": "This feature is supported when using Babel with <a href='https://github.com/zloirock/core-js'>core-js</a>."
},
"optional": {
"val": "flagged",
"note_id": "babel-optional-flag",
"note_html": "This feature features requires an optional transformer setting."
},
"regenerator": {
"val": true,
"note_id": "babel-regenerator",
"note_html": "This feature requires native generators or <code>regenerator-runtime</code>, it's a part of <code>babel-polyfill</code> or <code>babel-runtime</code>."
}
},
"typescript": {
"corejs": {
"val": true,
"note_id": "typescript-core-js",
"note_html": "This feature is supported when using TypeScript with <a href='https://github.com/zloirock/core-js'>core-js</a>."
},
"fallthrough": {
"val": "needs-polyfill-or-native",
"note_id": "typescript-es6",
"note_html": "TypeScript's compiler will accept code using this feature if the <code>--target ES6</code> flag is set, but passes it through unmodified and does not supply a runtime polyfill."
},
"downlevelIteration": {
"val": true,
"note_id": "typescript-downlevel-iteration",
"note_html": "Requires the <code>downlevelIteration</code> compile option."
},
"notDownlevelIteration": {
"val": false,
"note_id": "typescript-not-downlevel-iteration",
"note_html": "Does not work with the <code>downlevelIteration</code> compile option."
}
},
"edge": {
"experimental": {
"val": "flagged",
"note_id": "edge-experimental-flag",
"note_html": "Flagged features have to be enabled via \"Enable experimental Javascript features\" setting under <code>about:flags</code>"
}
},
"firefox": {
"sharedmem": {
"val": "flagged",
"note_id": "firefox-sharedmem",
"note_html": "The feature has to be enabled via <code>javascript.options.shared_memory</code> setting under <code>about:config</code>. It is enabled by default in Firefox Developer Edition and Firefox Nightly builds."
},
"nomob": {
"val": "flagged",
"note_id": "firefox-nomob",
"note_html": "The feature is available on desktop versions only, it is not available on mobile versions yet."
},
"beta": {
"val": "flagged",
"note_id": "firefox-beta",
"note_html": "The feature is available only in Firefox Beta, Firefox Developer Edition and Firefox Nightly builds."
},
"developer": {
"val": "flagged",
"note_id": "firefox-developer",
"note_html": "The feature is available only in Firefox Developer Edition and Firefox Nightly builds."
},
"nightly": {
"val": "flagged",
"note_id": "firefox-nightly",
"note_html": "The feature is available only in Firefox Nightly builds."
},
"bigint": {
"val": "flagged",
"note_id": "firefox-bigint",
"note_html": "The feature has to be enabled via <code>javascript.options.bigint</code> setting under <code>about:config</code>."
},
"classFields": {
"val": "flagged",
"note_id": "firefox-class-fields",
"note_html": "The feature has to be enabled via <code>javascript.options.experimental.fields</code> setting under <code>about:config</code>."
},
"privateFields": {
"val": "flagged",
"note_id": "fx-private-fields",
"note_html": "The feature has to be enabled via <code>javascript.options.experimental.private_fields</code> setting under <code>about:config</code>."
},
"privateClassFields": {
"val": false,
"note_id": "firefox-private-class-fields",
"note_html": "The feature has to be enabled via <code>javascript.options.experimental.fields</code> setting under <code>about:config</code>. Private fields are supported by parser, but behave as public fields."
}
},
"chrome": {
"sharedmem": {
"val": "flagged",
"note_id": "chrome-sharedmem",
"note_html": "The feature has to be enabled via \"Experimental enabled SharedArrayBuffer support in JavaScript.\" setting under <code>about:flags</code>"
},
"experimental": {
"val": "flagged",
"note_id": "chrome-experimental",
"note_html": "The feature has to be enabled via \"Experimental Javascript features\" setting under <code>about:flags</code>"
},
"harmony": {
"val": "flagged",
"note_id": "chrome-harmony",
"note_html": "The feature has to be enabled via <code>--js-flags=\"--harmony\"</code> flag"
},
"tco": {
"val": false,
"note_id": "chrome-tco",
"note_html": "The feature is considered unstable, but can be enabled via <code>--js-flags=\"--harmony-tailcalls\"</code> flag"
},
"promise": {
"val": false,
"note_id": "chrome-promise",
"note_html": "The feature is considered unstable, but can be enabled via <code>--js-flags=\"--harmony-promise-finally\"</code> flag"
},
"simd": {
"val": false,
"note_id": "chrome-simd",
"note_html": "The feature is considered unstable, but can be enabled via <code>--js-flags=\"--harmony-simd\"</code> flag"
},
"stringPrototypeReplaceAll": {
"val": "flagged",
"note_id": "chrome-string-prototype-replace-all",
"note_html": "The feature is considered unstable, but can be enabled via <code>--js-flags=\"--harmony-string-replaceall\"</code> flag"
}
},
"safari": {
"templateStringsPermanentCaching": {
"val": false,
"note_id": "safari-templ-cahing",
"note_html": "Safari 12 caches TemplateStrings using a GC-able \"CodeBlock\". But TemplateStrings are supposed to always be identical! When the CodeBlock is reclaimed, the TemplateStrings' identity is broken. Thankfully, <code>[[Call]]</code> vs <code>[[Construct]]</code> generate different CodeBlocks, which exposes the <a href='https://bugs.webkit.org/show_bug.cgi?id=190756'>broken behavior.</a>"
}
},
"graalvm": {
"es6flag": {
"val": "flagged",
"note_id": "graalvm-js-ecmascript-version-6",
"note_html": "Requires the <code>--js.ecmascript-version=6</code> flag."
},
"es2020flag": {
"val": "flagged",
"note_id": "graalvm-js-ecmascript-version-2020",
"note_html": "Requires the <code>--js.ecmascript-version=2020</code> flag."
},
"es2021flag": {
"val": "flagged",
"note_id": "graalvm-js-ecmascript-version-2021",
"note_html": "Requires the <code>--js.ecmascript-version=2021</code> flag."
},
"es2022flag": {
"val": "flagged",
"note_id": "graalvm-js-ecmascript-version-2022",
"note_html": "Requires the <code>--js.ecmascript-version=2022</code> flag."
},
"esStagingFlag": {
"val": "flagged",
"note_id": "graalvm-js-ecmascript-version-staging",
"note_html": "Requires the <code>--js.ecmascript-version=staging</code> flag."
},
"newSetMethodsFlag": {
"val": "flagged",
"note_id": "graalvm-experimental-options-js-new-set-methods",
"note_html": "Requires the <code>--experimental-options --js.new-set-methods</code> flags."
},
"v8CompatFlag": {
"val": "flagged",
"note_id": "graalvm-experimental-options-js-v8-compat",
"note_html": "Requires the <code>--experimental-options --js.v8-compat</code> flags."
},
"nashornCompatFlag": {
"val": "flagged",
"note_id": "graalvm-experimental-options-js-nashorn-compat",
"note_html": "Requires the <code>--experimental-options --js.nashorn-compat</code> flags."
},
"globalPropertyFlag": {
"val": "flagged",
"note_id": "graalvm-experimental-options-js-global-property",
"note_html": "Requires the <code>--experimental-options --js.global-property</code> flags."
}
},
"hermes": {
"xEs6PromiseFlag": {
"val": "flagged",
"note_id": "hermes-promise",
"note_html": "The feature can be enabled via <code>-Xes6-promise</code> flag"
},
"xEs6SymbolFlag": {
"val": "flagged",
"note_id": "hermes-symbol",
"note_html": "The feature can be enabled via <code>-Xes6-symbol</code> flag"
},
"xEs6ProxyFlag": {
"val": "flagged",
"note_id": "hermes-proxy",
"note_html": "The feature can be enabled via <code>-Xes6-proxy</code> flag"
},
"evalStrictMode": {
"val": false,
"note_id": "hermes-eval-strict-mode",
"note_html": "Hermes isn't supporting strict mode in eval, test result is unrepresentative. See <a href=\"https://github.com/facebook/hermes/issues/102#issuecomment-528489267\">this comment</a> for details"
},
"evalLexicalScopeFailed": {
"val": false,
"note_id": "hermes-eval-lexical-scope-failed",
"note_html": "Hermes isn't supporting lexical scope in eval"
},
"evalLexicalScopeSuccess": {
"val": true,
"note_id": "hermes-eval-lexical-scope-success",
"note_html": "Hermes isn't supporting lexical scope in eval, test result is unrepresentative"
},
"catchDestructuring": {
"val": false,
"note_id": "hermes-catch-destructuring",
"note_html": "Hermes isn't currently supporting destructuring in catch parameters"
},
"class": {
"val": false,
"note_id": "hermes-class",
"note_html": "Hermes isn't currently supporting classes apparently"
}
},
"sparseNote": {
"val": true,
"note_id": "sparse_arrays",
"note_html": "Internet Explorer 6 - 8 do not differentiate between a dense array with undefined values, and a sparse array. Specifically, <code>`0 in [,]`</code> and <code>`0 in [undefined]`</code> both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. As such, ES5 array iteration methods can only be shimmed reliably when dealing with dense arrays."
}
}