Move the js module to a js_sys crate (#512)

* Move the `js` module to a `js_sys` crate

* Update js-sys tests to pass again

* Update binding_to_unimplemented_apis_doesnt_break_everything

Remove its dependency on the `js` module

* Update metadata for js-sys

* Fix the `closures` example

crates/js-sys/tests/all/ArrayBuffer.rs

@@ -0,0 +1,114 @@
+#![allow(non_snake_case)]
+
+use super::project;
+
+#[test]
+fn new() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(use_extern_macros)]
+
+            extern crate wasm_bindgen;
+            extern crate js_sys;
+            use wasm_bindgen::prelude::*;
+            use js_sys::ArrayBuffer;
+
+            #[wasm_bindgen]
+            pub fn new_arraybuffer() -> ArrayBuffer {
+                ArrayBuffer::new(42)
+            }
+        "#)
+        .file("test.js", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(typeof wasm.new_arraybuffer(), "object");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn is_view() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(use_extern_macros)]
+
+            extern crate wasm_bindgen;
+            extern crate js_sys;
+            use JsValue;
+            use wasm_bindgen::prelude::*;
+            use js_sys::ArrayBuffer;
+
+            #[wasm_bindgen]
+            pub fn is_view(value: JsValue) -> bool {
+                ArrayBuffer::is_view(value)
+            }
+        "#)
+        .file("test.js", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(wasm.is_view(new Uint8Array(42)), true);
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn slice() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(use_extern_macros)]
+
+            extern crate wasm_bindgen;
+            extern crate js_sys;
+            use wasm_bindgen::prelude::*;
+            use js_sys::ArrayBuffer;
+
+            #[wasm_bindgen]
+            pub fn slice(arraybuffer: &ArrayBuffer, begin: u32) -> ArrayBuffer {
+                arraybuffer.slice(begin)
+            }
+        "#)
+        .file("test.js", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const arraybuffer = new ArrayBuffer(4);
+                assert.equal(typeof wasm.slice(arraybuffer, 2), "object");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn slice_with_end() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(use_extern_macros)]
+
+            extern crate wasm_bindgen;
+            extern crate js_sys;
+            use wasm_bindgen::prelude::*;
+            use js_sys::ArrayBuffer;
+
+            #[wasm_bindgen]
+            pub fn slice_with_end(arraybuffer: &ArrayBuffer, begin: u32, end: u32) -> ArrayBuffer {
+                arraybuffer.slice_with_end(begin, end)
+            }
+        "#)
+        .file("test.js", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const arraybuffer = new ArrayBuffer(4);
+                assert.equal(typeof wasm.slice_with_end(arraybuffer, 1, 2), "object");
+            }
+        "#)
+        .test()
+}