Add string

Author: jonathan-s

src/js.rs

@@ -86,3 +86,24 @@ extern {
     #[wasm_bindgen(method, js_name = hasOwnProperty)]
     pub fn has_own_property(this: &Object, property: &str) -> bool;
 }
+
+
+// String
+#[wasm_bindgen]
+extern {
+    pub type String;
+
+    /// The String global object is a constructor for strings or a sequence
+    /// of characters.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> String;
+
+    /// The length property of a String object indicates the length of a
+    /// string, in UTF-16 code units.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length
+    #[wasm_bindgen(method, js_name = length)]
+    pub fn length(this: &String) -> i32;
+}

tests/all/js_globals/String.rs

@@ -0,0 +1,29 @@
+#![allow(non_snake_case)]
+
+use project;
+
+#[test]
+fn new() {
+    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_string() -> js::String {
+                js::String::new()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(typeof wasm.new_string(), "string");
+            }
+        "#)
+        .test()
+}

tests/all/js_globals/mod.rs

@@ -3,6 +3,7 @@
 use super::project;
 
 mod Object;
+mod String;
 
 #[test]
 #[cfg(feature = "std")]