Merge branch 'features/bigint-parameters'

Author: surma

README.md

@@ -6,7 +6,7 @@ A small library to detect which features of WebAssembly are supported.
 - ✅ Runs in Node
 - ✅ Provided as an ES6 module, CommonJS and UMD module.
 - ✅ CSP compatible
-- ✅ Only ~504B gzipped
+- ✅ Only ~580B gzipped
 
 ## Installation
 
@@ -45,6 +45,7 @@ All detectors return a `Promise<bool>`.
 
 | Function                | Proposal                                                                                                     |
 | ----------------------- | ------------------------------------------------------------------------------------------------------------ |
+| `bigInt()`              | [BigInt integration](https://github.com/WebAssembly/JS-BigInt-integration)                                   |
 | `bulkMemory()`          | [Bulk memory operations](https://github.com/webassembly/bulk-memory-operations)                              |
 | `exceptions()`          | [Exception handling](https://github.com/WebAssembly/exception-handling)                                      |
 | `multiValue()`          | [Multi-value](https://github.com/WebAssembly/multi-value)                                                    |

src/detectors/big-int/index.js

@@ -0,0 +1,22 @@
+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export default async function(bytes) {
+  try {
+    const n = BigInt(0);
+    const instance = await WebAssembly.instantiate(bytes);
+    return instance.instance.exports.b(n) === n;
+  } catch {
+    return false;
+  }
+}

src/detectors/big-int/module.wat

@@ -0,0 +1,8 @@
+;; Name: BigInt integration
+;; Proposal: https://github.com/WebAssembly/JS-BigInt-integration
+
+(module
+  (func (export "b") (param i64) (result i64)
+    local.get 0
+  )
+)

test/index.js

@@ -43,6 +43,7 @@ async function run() {
   await checkFeature("simd");
   await checkFeature("tailCall");
   await checkFeature("threads");
+  await checkFeature("bigInt");
 }
 
 run();