Add toLocaleString to Number

src/js.rs

@@ -213,6 +213,13 @@ extern {
 extern {
     pub type Number;
 
+    /// The toLocaleString() method returns a string with a language sensitive
+    /// representation of this number.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
+    #[wasm_bindgen(method, js_name = toLocaleString)]
+    pub fn to_locale_string(this: &Number, locale: String) -> String;
+
     /// The toPrecision() method returns a string representing the Number
     /// object to the specified precision.
     ///

tests/all/js_globals/Number.rs

@@ -2,6 +2,36 @@
 
 use super::project;
 
+
+#[test]
+fn to_locale_string() {
+    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 to_locale_string(this: &js::Number, locale: String) -> String {
+                this.to_locale_string(locale)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let number = 1234.45;
+                assert.equal(wasm.to_locale_string(number, "de-DE"), "1,234.45");
+                assert.equal(wasm.to_locale_string(number, "en-US"), "1,234.45");
+                assert.equal(wasm.to_locale_string(number, "zh-Hans-CN-u-nu-hanidec"), "1,234.45");
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn to_precision() {
     project()