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features.json
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{
"$schema": "./features.schema.json",
"features": {
"bigInt": {
"description": "JS BigInt to Wasm i64 integration",
"url": "https://github.com/WebAssembly/JS-BigInt-integration",
"phase": 5
},
"bulkMemory": {
"description": "Bulk memory operations",
"url": "https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md",
"phase": 5
},
"exceptions": {
"description": "Exception handling",
"url": "https://github.com/WebAssembly/exception-handling/blob/master/proposals/exception-handling/Exceptions.md",
"phase": 3
},
"extendedConst": {
"description": "Extended constant expressions",
"url": "https://github.com/WebAssembly/extended-const/blob/master/proposals/extended-const/Overview.md",
"phase": 4
},
"gc": {
"description": "Garbage collection",
"url":"https://github.com/WebAssembly/gc",
"phase": 4
},
"jspi": {
"description": "JS Promise Integration",
"url":"https://github.com/WebAssembly/js-promise-integration",
"phase": 3
},
"memory64": {
"description": "Memory64",
"url": "https://github.com/WebAssembly/memory64/blob/master/proposals/memory64/Overview.md",
"phase": 3
},
"multiMemory": {
"description": "Multiple memories",
"url": "https://github.com/WebAssembly/multi-memory/blob/master/proposals/multi-memory/Overview.md",
"phase": 4
},
"multiValue": {
"description": "Multi-value",
"url": "https://github.com/WebAssembly/spec/blob/master/proposals/multi-value/Overview.md",
"phase": 4
},
"mutableGlobals": {
"description": "Mutable globals",
"url": "https://github.com/WebAssembly/mutable-global/blob/master/proposals/mutable-global/Overview.md",
"phase": 5
},
"referenceTypes": {
"description": "Reference types",
"url": "https://github.com/WebAssembly/reference-types/blob/master/proposals/reference-types/Overview.md",
"phase": 5
},
"relaxedSimd": {
"description": "Relaxed SIMD",
"url": "https://github.com/WebAssembly/relaxed-simd/tree/main/proposals/relaxed-simd",
"phase": 4
},
"saturatedFloatToInt": {
"description": "Non-trapping float-to-int conversions",
"url": "https://github.com/WebAssembly/spec/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md",
"phase": 5
},
"signExtensions": {
"description": "Sign-extension operations",
"url": "https://github.com/WebAssembly/spec/blob/master/proposals/sign-extension-ops/Overview.md",
"phase": 5
},
"simd": {
"description": "Fixed-width SIMD",
"url": "https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md",
"phase": 5
},
"tailCall": {
"description": "Tail calls",
"url": "https://github.com/WebAssembly/tail-call/blob/master/proposals/tail-call/Overview.md",
"phase": 4
},
"threads": {
"description": "Threads and atomics",
"url": "https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md",
"phase": 4
},
"typeReflection": {
"description": "Type reflection",
"url": "https://github.com/WebAssembly/js-types/blob/main/proposals/js-types/Overview.md",
"phase": 3
}
},
"browsers": {
"Chrome": {
"url": "https://www.google.com/chrome/",
"logo": "/images/chrome.svg",
"features": {
"bigInt": "85",
"bulkMemory": "75",
"exceptions": "95",
"extendedConst": "114",
"gc": "119",
"jspi": ["flag", "Requires flag `chrome://flags/#enable-experimental-webassembly-stack-switching`"],
"memory64": ["flag", "Requires flag `chrome://flags/#enable-experimental-webassembly-features`"],
"multiMemory": "120",
"multiValue": "85",
"mutableGlobals": "74",
"relaxedSimd": "114",
"referenceTypes": "96",
"saturatedFloatToInt": "75",
"signExtensions": "74",
"simd": "91",
"tailCall": "112",
"threads": "74",
"typeReflection": ["flag", "Requires flag `chrome://flags/#enable-experimental-webassembly-features`"]
}
},
"Firefox": {
"url": "https://www.mozilla.org/firefox/",
"logo": "/images/firefox.svg",
"features": {
"bigInt": "78",
"bulkMemory": "79",
"exceptions": "100",
"extendedConst": "112",
"gc": "120",
"memory64": ["flag", "Enabled in Nightly, unavailable in Beta/Release"],
"multiMemory": "125",
"multiValue": "78",
"mutableGlobals": "61",
"referenceTypes": "79",
"relaxedSimd": ["flag", "Enabled in Nightly, unavailable in Beta/Release"],
"saturatedFloatToInt": "64",
"signExtensions": "62",
"simd": "89",
"tailCall": "121",
"threads": "79",
"typeReflection": ["flag", "Enabled in Nightly, unavailable in Beta/Release"]
}
},
"Safari": {
"url": "https://www.apple.com/safari/",
"logo": "/images/safari.svg",
"features": {
"bigInt": ["15", "wasm-bigint is supported in desktop Safari since 14.1 and iOS Safari since 14.5; however BigInt64Array, which is needed by Emscripten, was released in 15"],
"bulkMemory": "15",
"exceptions": "15.2",
"extendedConst": "17.4",
"multiValue": "13.1",
"mutableGlobals": "12",
"referenceTypes": "15",
"saturatedFloatToInt": "15",
"signExtensions": ["14.1", "Supported in desktop Safari since 14.1 and iOS Safari since 14.5"],
"simd": "16.4",
"tailCall": false,
"threads": ["14.1", "Supported in desktop Safari since 14.1 and iOS Safari since 14.5"]
}
},
"Wasmtime": {
"url": "https://wasmtime.dev/",
"logo": "/images/bca.svg",
"features": {
"bigInt": null,
"bulkMemory": "0.20",
"jspi": null,
"memory64": ["flag", "Requires flag `--wasm=memory64`"],
"multiMemory": "15",
"multiValue": "0.17",
"mutableGlobals": true,
"referenceTypes": "0.20",
"relaxedSimd": "15",
"saturatedFloatToInt": true,
"signExtensions": true,
"simd": "0.33",
"tailCall": ["flag", "Requires flag `--wasm=tail-call`"],
"threads": "15"
}
},
"Wasmer": {
"url": "https://wasmer.io/",
"logo": "/images/wasmer.svg",
"features": {
"bigInt": null,
"bulkMemory": "1.0",
"jspi": null,
"multiValue": "1.0",
"mutableGlobals": "0.7",
"referenceTypes": "2.0",
"saturatedFloatToInt": true,
"signExtensions": true,
"simd": "2.0",
"typeReflection": "2.0"
}
},
"Node.js": {
"url": "https://nodejs.org/",
"logo": "/images/nodejs.svg",
"features": {
"bigInt": "15.0",
"bulkMemory": "12.5",
"exceptions": "17.0",
"extendedConst": ["flag", "Requires flag `--experimental-wasm-extended-const`"],
"gc": "22.0",
"jspi": ["flag", "Requires flag `--experimental-wasm-stack-switching`"],
"memory64": ["flag", "Requires flag `--experimental-wasm-memory64`"],
"multiMemory": ["flag", "Requires flag `--experimental-wasm-multi-memory`"],
"multiValue": "15.0",
"mutableGlobals": "12.0",
"referenceTypes": "17.2",
"relaxedSimd": ["flag", "Requires flag `--experimental-wasm-relaxed-simd`"],
"saturatedFloatToInt": "12.5",
"signExtensions": "12.0",
"simd": "16.4",
"tailCall": "20.0",
"threads": "16.4",
"typeReflection": ["flag", "Requires flag `--experimental-wasm-type-reflection`"]
}
},
"Deno": {
"url": "https://deno.land/",
"logo": "/images/deno.svg",
"features": {
"bigInt": "1.1.2",
"bulkMemory": "0.4",
"exceptions": "1.16",
"extendedConst": ["flag", "Requires flag `--v8-flags=--experimental-wasm-extended-const`"],
"gc": "1.38",
"jspi": ["flag", "Requires flag `--v8-flags=--experimental-stack-switching`"],
"memory64": ["flag", "Requires flag `--v8-flags=--experimental-wasm-memory64`"],
"multiValue": "1.3.2",
"mutableGlobals": "0.1",
"referenceTypes": "1.16",
"relaxedSimd": ["flag", "Requires flag `--v8-flags=--experimental-wasm-relaxed-simd`"],
"saturatedFloatToInt": "0.4",
"signExtensions": "0.1",
"simd": "1.9",
"tailCall": ["flag", "Requires flag `--v8-flags=--experimental-wasm-return-call`"],
"threads": "1.9",
"typeReflection": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"]
}
},
"wasm2c": {
"url": "https://github.com/WebAssembly/wabt",
"logo": "/images/wasm2c.svg",
"features": {
"bigInt": null,
"bulkMemory": "1.0.30",
"exceptions": ["flag", "Requires flag `--enable-exceptions`"],
"extendedConst": ["flag", "Requires flag `--enable-extended-const`"],
"jspi": null,
"memory64": ["flag", "Requires flag `--enable-memory64`"],
"multiMemory": ["flag", "Requires flag `--enable-multi-memory`"],
"tailCall": ["flag", "Requires flag `--enable-tail-call`"],
"multiValue": "1.0.24",
"mutableGlobals": "1.0.1",
"referenceTypes": "1.0.31",
"saturatedFloatToInt": "1.0.24",
"signExtensions": "1.0.24",
"simd": "1.0.33"
}
}
}
}