From b797bbc39cde31db616917046374e4f3986fcdac Mon Sep 17 00:00:00 2001
From: Alexander Kryvomaz <akryvomaz@gmail.com>
Date: Tue, 3 Jul 2018 23:48:54 +0300
Subject: [PATCH] bindings for Generator.throw()

---
 src/js.rs                         |  7 +++++
 tests/all/js_globals/Generator.rs | 46 +++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/src/js.rs b/src/js.rs
index 9618d57f..ca415c66 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -386,6 +386,13 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator/next
     #[wasm_bindgen(method, structural)]
     pub fn next(this: &Generator, value: &JsValue) -> JsValue;
+
+    /// The throw() method resumes the execution of a generator by throwing an error into it
+    /// and returns an object with two properties done and value.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator/throw
+    #[wasm_bindgen(method, structural)]
+    pub fn throw(this: &Generator, error: &Error) -> JsValue;
 }
 
 // Map
diff --git a/tests/all/js_globals/Generator.rs b/tests/all/js_globals/Generator.rs
index ee061c27..e50cf33c 100644
--- a/tests/all/js_globals/Generator.rs
+++ b/tests/all/js_globals/Generator.rs
@@ -89,3 +89,49 @@ fn next() {
         )
         .test()
 }
+
+#[test]
+fn throw() {
+    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 gen_throw(this: &js::Generator, error: &js::Error) -> JsValue {
+                this.throw(error)
+            }
+        "#,
+        )
+        .file(
+            "test.ts",
+            r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                function* generator() {
+                    yield 1;
+                    yield 2;
+                }
+
+                const gen = generator();
+                gen.next();
+
+                try {
+                    wasm.gen_throw(gen, new Error('Something went wrong'));
+                } catch(err) {
+                    assert.equal(err.message, 'Something went wrong');
+                }
+
+                assert.deepEqual(gen.next(), { value: undefined, done: true });
+            }
+        "#,
+        )
+        .test()
+}