Bindings for Proxy.revocable()

Signed-off-by: Stephan Renatus <srenatus@chef.io>

src/js.rs

@@ -1042,6 +1042,12 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
     #[wasm_bindgen(constructor)]
     pub fn new(target: &JsValue, handler: &Object) -> Proxy;
+
+    /// The Proxy.revocable() method is used to create a revocable Proxy object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/revocable
+    #[wasm_bindgen(static_method_of = Proxy)]
+    pub fn revocable(target: &JsValue, handler: &Object) -> Object;
 }
 
 // Set

tests/all/js_globals/Proxy.rs

@@ -35,3 +35,42 @@ fn new() {
         "#)
         .test()
 }
+
+#[test]
+fn revocable() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn new_revocable_proxy(target: JsValue, handler: js::Object) -> js::Object {
+                js::Proxy::revocable(&target, &handler)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const target = { a: 100 };
+                const handler = {
+                     get: function(obj: any, prop: any) {
+                         return prop in obj ? obj[prop] : 37;
+                     }
+                };
+                const { proxy, revoke } =
+                   wasm.new_revocable_proxy(target, handler);
+                assert.equal(proxy.a, 100);
+                assert.equal(proxy.b, 37);
+                revoke();
+                assert.throws(() => { proxy.a }, TypeError);
+                assert.throws(() => { proxy.b }, TypeError);
+                assert.equal(typeof proxy, "object");
+            }
+        "#)
+        .test()
+}